char = A;code = 65 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = m;code = 109 char = o;code = 111 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = f;code = 102 char = f;code = 102 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = m;code = 109 char = o;code = 111 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = .;code = 46 result sql = Arsenic and chromium removal by mixed magnetite-maghemite nanoparticles and the effect of phosphate on removal.
Arsenic and chromium removal by mixed magnetite-maghemite nanoparticles and the effect of phosphate on removal.char = A;code = 65 char = d;code = 100 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = p;code = 112 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = a;code = 97 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = o;code = 111 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = c;code = 99 char = h;code = 104 char = n;code = 110 char = o;code = 111 char = l;code = 108 char = o;code = 111 char = g;code = 103 char = y;code = 121 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = b;code = 98 char = a;code = 97 char = t;code = 116 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = y;code = 121 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = g;code = 103 char = r;code = 114 char = a;code = 97 char = d;code = 100 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = -;code = 45 char = s;code = 115 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = ;code = 32 char = ';code = 39 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ';code = 39 char = ,;code = 44 char = ;code = 32 char = l;code = 108 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = f;code = 102 char = i;code = 105 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = l;code = 108 char = a;code = 97 char = b;code = 98 char = o;code = 111 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = o;code = 111 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = i;code = 105 char = z;code = 122 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = b;code = 98 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = f;code = 102 char = f;code = 102 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = s;code = 115 char = a;code = 97 char = m;code = 109 char = p;code = 112 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = f;code = 102 char = y;code = 121 char = ;code = 32 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = l;code = 108 char = o;code = 111 char = p;code = 112 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = a;code = 97 char = c;code = 99 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = d;code = 100 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = f;code = 102 char = u;code = 117 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = g;code = 103 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = m;code = 109 char = e;code = 101 char = d;code = 100 char = i;code = 105 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = u;code = 117 char = d;code = 100 char = y;code = 121 char = ;code = 32 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = 9;code = 57 char = 6;code = 54 char = -;code = 45 char = 9;code = 57 char = 9;code = 57 char = %;code = 37 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = o;code = 111 char = l;code = 108 char = l;code = 108 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = d;code = 100 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = x;code = 120 char = i;code = 105 char = m;code = 109 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = p;code = 112 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = c;code = 99 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = 2;code = 50 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = u;code = 117 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = 3;code = 51 char = .;code = 46 char = 6;code = 54 char = 9;code = 57 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = g;code = 103 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = (;code = 40 char = I;code = 73 char = I;code = 73 char = I;code = 73 char = );code = 41 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 3;code = 51 char = .;code = 46 char = 7;code = 55 char = 1;code = 49 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = g;code = 103 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = (;code = 40 char = V;code = 86 char = );code = 41 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = k;code = 107 char = e;code = 101 char = p;code = 112 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 5;code = 53 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = b;code = 98 char = o;code = 111 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = ,;code = 44 char = ;code = 32 char = w;code = 119 char = h;code = 104 char = i;code = 105 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = (;code = 40 char = V;code = 86 char = I;code = 73 char = );code = 41 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = 2;code = 50 char = .;code = 46 char = 4;code = 52 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = 2;code = 50 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = (;code = 40 char = V;code = 86 char = I;code = 73 char = );code = 41 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = 1;code = 49 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = d;code = 100 char = i;code = 105 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = b;code = 98 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = i;code = 105 char = d;code = 100 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = r;code = 114 char = a;code = 97 char = n;code = 110 char = g;code = 103 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = R;code = 82 char = e;code = 101 char = d;code = 100 char = o;code = 111 char = x;code = 120 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = H;code = 72 char = ;code = 32 char = d;code = 100 char = a;code = 97 char = t;code = 116 char = a;code = 97 char = ;code = 32 char = h;code = 104 char = e;code = 101 char = l;code = 108 char = p;code = 112 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = f;code = 102 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = p;code = 112 char = o;code = 111 char = s;code = 115 char = s;code = 115 char = i;code = 105 char = b;code = 98 char = l;code = 108 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = n;code = 110 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = s;code = 115 char = p;code = 112 char = e;code = 101 char = c;code = 99 char = i;code = 105 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = o;code = 111 char = x;code = 120 char = i;code = 105 char = d;code = 100 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = l;code = 108 char = u;code = 117 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = .;code = 46 char = ;code = 32 char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = u;code = 117 char = l;code = 108 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = s;code = 115 char = o;code = 111 char = ;code = 32 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = l;code = 108 char = i;code = 105 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = b;code = 98 char = y;code = 121 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = -;code = 45 char = s;code = 115 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = p;code = 112 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = c;code = 99 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = .;code = 46 char = ;code = 32 char = A;code = 65 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = b;code = 98 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = 0;code = 48 char = .;code = 46 char = 4;code = 52 char = ;code = 32 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = .;code = 46 char = ;code = 32 char = N;code = 78 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = -;code = 45 char = s;code = 115 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = i;code = 105 char = x;code = 120 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = d;code = 100 char = s;code = 115 char = o;code = 111 char = r;code = 114 char = b;code = 98 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 5;code = 53 char = 0;code = 48 char = %;code = 37 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 3;code = 51 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 2;code = 50 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = t;code = 116 char = i;code = 105 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ,;code = 44 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 5;code = 53 char = 0;code = 48 char = %;code = 37 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = f;code = 102 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = y;code = 121 char = n;code = 110 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 5;code = 53 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 0;code = 48 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = c;code = 99 char = h;code = 104 char = r;code = 114 char = o;code = 111 char = m;code = 109 char = i;code = 105 char = u;code = 117 char = m;code = 109 char = (;code = 40 char = V;code = 86 char = I;code = 73 char = );code = 41 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = n;code = 110 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = r;code = 114 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = g;code = 103 char = r;code = 114 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = d;code = 100 char = w;code = 119 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = m;code = 109 char = o;code = 111 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 5;code = 53 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = p;code = 112 char = h;code = 104 char = o;code = 111 char = s;code = 115 char = p;code = 112 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 1;code = 49 char = .;code = 46 char = 1;code = 49 char = 3;code = 51 char = ;code = 32 char = m;code = 109 char = g;code = 103 char = /;code = 47 char = L;code = 76 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ,;code = 44 char = ;code = 32 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = 6;code = 54 char = 0;code = 48 char = %;code = 37 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = h;code = 104 char = i;code = 105 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = d;code = 100 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = ,;code = 44 char = ;code = 32 char = i;code = 105 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = i;code = 105 char = p;code = 112 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = a;code = 97 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = o;code = 111 char = p;code = 112 char = t;code = 116 char = i;code = 105 char = m;code = 109 char = u;code = 117 char = m;code = 109 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = s;code = 115 char = i;code = 105 char = g;code = 103 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = n;code = 110 char = e;code = 101 char = t;code = 116 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = -;code = 45 char = m;code = 109 char = a;code = 97 char = g;code = 103 char = h;code = 104 char = e;code = 101 char = m;code = 109 char = i;code = 105 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = n;code = 110 char = a;code = 97 char = n;code = 110 char = o;code = 111 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = s;code = 115 char = ;code = 32 char = m;code = 109 char = a;code = 97 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = c;code = 99 char = h;code = 104 char = i;code = 105 char = e;code = 101 char = v;code = 118 char = e;code = 101 char = ;code = 32 char = h;code = 104 char = i;code = 105 char = g;code = 103 char = h;code = 104 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = s;code = 115 char = e;code = 101 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = ;code = 32 char = u;code = 117 char = p;code = 112 char = t;code = 116 char = a;code = 97 char = k;code = 107 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = e;code = 101 char = l;code = 108 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = l;code = 108 char = i;code = 105 char = c;code = 99 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = .;code = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = Adsorption of arsenic and chromium by mixed magnetite and maghemite nanoparticles from aqueous solution is a promising technology. In the present batch experimental study, a commercially grade nano-size 'magnetite', later identified in laboratory characterization to be mixed magnetite-maghemite nanoparticles, was used in the uptake of arsenic and chromium from different water samples. The intent was to identify or develop a practical method for future groundwater remediation. The results of the study showed 96-99% arsenic and chromium uptake under controlled pH conditions. The maximum arsenic adsorption occurred at pH 2 with values of 3.69 mg/g for arsenic(III) and 3.71 mg/g for arsenic(V) when the initial concentration was kept at 1.5 mg/L for both arsenic species, while chromium(VI) concentration was 2.4 mg/g at pH 2 with an initial chromium(VI) concentration of 1 mg/L. Thus magnetite-maghemite nanoparticles can readily adsorb arsenic and chromium in an acidic pH range. Redox potential and pH data helped to infer possible dominating species and oxidation states of arsenic and chromium in solution. The results also showed the limitation of arsenic and chromium uptake by the nano-size magnetite-maghemite mixture in the presence of a competing anion such as phosphate. At a fixed adsorbent concentration of 0.4 g/L, arsenic and chromium uptake decreased with increasing phosphate concentration. Nano-size magnetite-maghemite mixed particles adsorbed less than 50% arsenic from synthetic water containing more than 3 mg/L phosphate and 1.2 mg/L of initial arsenic concentration, and less than 50% chromium from synthetic water containing more than 5 mg/L phosphate and 1.0 mg/L of chromium(VI). In natural groundwater containing more than 5 mg/L phosphate and 1.13 mg/L of arsenic, less than 60% arsenic uptake was achieved. In this case, it is anticipated that an optimum design with magnetite-maghemite nanoparticles may achieve high arsenic uptake in field applications.
Publication: J. Environ. Manage. 2010 Nov ;91(11)::2238-47. :doi: 10.1016/j.jenvman.2010.06.003.
Publication Date: 2010 Nov
Study Author(s): Chowdhury, Saidur Rahman;Yanful, Ernest K;
Institution: Department of Civil and Environmental Engineering, University of Western Ontario, London, ON N6A 5B9, Canada.
[email protected]
Shortcut link to this study:
Adsorption of arsenic and chromium by mixed magnetite and maghemite nanoparticles from aqueous solution is a promising technology. In the present batch experimental study, a commercially grade nano-size 'magnetite', later identified in laboratory characterization to be mixed magnetite-maghemite nanoparticles, was used in the uptake of arsenic and chromium from different water samples. The intent was to identify or develop a practical method for future groundwater remediation. The results of the study showed 96-99% arsenic and chromium uptake under controlled pH conditions. The maximum arsenic adsorption occurred at pH 2 with values of 3.69 mg/g for arsenic(III) and 3.71 mg/g for arsenic(V) when the initial concentration was kept at 1.5 mg/L for both arsenic species, while chromium(VI) concentration was 2.4 mg/g at pH 2 with an initial chromium(VI) concentration of 1 mg/L. Thus magnetite-maghemite nanoparticles can readily adsorb arsenic and chromium in an acidic pH range. Redox potential and pH data helped to infer possible dominating species and oxidation states of arsenic and chromium in solution. The results also showed the limitation of arsenic and chromium uptake by the nano-size magnetite-maghemite mixture in the presence of a competing anion such as phosphate. At a fixed adsorbent concentration of 0.4 g/L, arsenic and chromium uptake decreased with increasing phosphate concentration. Nano-size magnetite-maghemite mixed particles adsorbed less than 50% arsenic from synthetic water containing more than 3 mg/L phosphate and 1.2 mg/L of initial arsenic concentration, and less than 50% chromium from synthetic water containing more than 5 mg/L phosphate and 1.0 mg/L of chromium(VI). In natural groundwater containing more than 5 mg/L phosphate and 1.13 mg/L of arsenic, less than 60% arsenic uptake was achieved. In this case, it is anticipated that an optimum design with magnetite-maghemite nanoparticles may achieve high arsenic uptake in field applications.
PMID: 20598797