char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = b;code = 98 char = u;code = 117 char = r;code = 114 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = e;code = 101 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 = r;code = 114 char = e;code = 101 char = l;code = 108 char = e;code = 101 char = a;code = 97 char = s;code = 115 char = e;code = 101 char = d;code = 100 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 = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = s;code = 115 char = .;code = 46 result sql = The mercury burden in waste water released from dental clinics.
The mercury burden in waste water released from dental clinics.char = T;code = 84 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = i;code = 105 char = m;code = 109 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = i;code = 105 char = s;code = 115 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 = 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 = e;code = 101 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = b;code = 98 char = u;code = 117 char = r;code = 114 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = e;code = 101 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 = 32 char = c;code = 99 char = o;code = 111 char = l;code = 108 char = l;code = 108 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = d;code = 100 char = u;code = 117 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = o;code = 111 char = n;code = 110 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = o;code = 111 char = r;code = 114 char = k;code = 107 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = d;code = 100 char = a;code = 97 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = 2;code = 50 char = 7;code = 55 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = c;code = 99 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 = 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 = 32 char = w;code = 119 char = e;code = 101 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = u;code = 117 char = b;code = 98 char = j;code = 106 char = e;code = 101 char = c;code = 99 char = t;code = 116 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = a;code = 97 char = u;code = 117 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = r;code = 114 char = i;code = 105 char = z;code = 122 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = a;code = 97 char = l;code = 108 char = y;code = 121 char = s;code = 115 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = u;code = 117 char = s;code = 115 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = e;code = 101 char = c;code = 99 char = h;code = 104 char = n;code = 110 char = i;code = 105 char = q;code = 113 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = Q;code = 81 char = S;code = 83 char = -;code = 45 char = I;code = 73 char = E;code = 69 char = ;code = 32 char = E;code = 69 char = n;code = 110 char = h;code = 104 char = a;code = 97 char = n;code = 110 char = c;code = 99 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = C;code = 67 char = o;code = 111 char = l;code = 108 char = d;code = 100 char = ;code = 32 char = V;code = 86 char = a;code = 97 char = p;code = 112 char = o;code = 111 char = u;code = 117 char = r;code = 114 char = ;code = 32 char = M;code = 77 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = A;code = 65 char = n;code = 110 char = a;code = 97 char = l;code = 108 char = y;code = 121 char = z;code = 122 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = i;code = 105 char = m;code = 109 char = a;code = 97 char = t;code = 116 char = e;code = 101 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = o;code = 111 char = u;code = 117 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = r;code = 114 char = g;code = 103 char = e;code = 101 char = d;code = 100 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 = e;code = 101 char = a;code = 97 char = n;code = 110 char = ;code = 32 char = v;code = 118 char = a;code = 97 char = l;code = 108 char = u;code = 117 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = r;code = 114 char = g;code = 103 char = e;code = 101 char = d;code = 100 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 = 9;code = 57 char = ;code = 32 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = t;code = 116 char = s;code = 115 char = ;code = 32 char = p;code = 112 char = e;code = 101 char = r;code = 114 char = ;code = 32 char = b;code = 98 char = i;code = 105 char = l;code = 108 char = l;code = 108 char = i;code = 105 char = o;code = 111 char = n;code = 110 char = ;code = 32 char = (;code = 40 char = p;code = 112 char = p;code = 112 char = b;code = 98 char = );code = 41 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = s;code = 115 char = ;code = 32 char = e;code = 101 char = q;code = 113 char = u;code = 117 char = i;code = 105 char = p;code = 112 char = p;code = 112 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 = a;code = 97 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = g;code = 103 char = a;code = 97 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = o;code = 111 char = r;code = 114 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = n;code = 110 char = d;code = 100 char = ;code = 32 char = 9;code = 57 char = 4;code = 52 char = .;code = 46 char = 7;code = 55 char = 5;code = 53 char = ;code = 32 char = p;code = 112 char = p;code = 112 char = b;code = 98 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = s;code = 115 char = ;code = 32 char = w;code = 119 char = i;code = 105 char = t;code = 116 char = h;code = 104 char = o;code = 111 char = u;code = 117 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = g;code = 103 char = a;code = 97 char = m;code = 109 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = o;code = 111 char = r;code = 114 char = s;code = 115 char = .;code = 46 char = ;code = 32 char = S;code = 83 char = o;code = 111 char = m;code = 109 char = e;code = 101 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 = m;code = 109 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = g;code = 103 char = a;code = 97 char = m;code = 109 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 = r;code = 114 char = e;code = 101 char = l;code = 108 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 = h;code = 104 char = e;code = 101 char = n;code = 110 char = ;code = 32 char = n;code = 110 char = e;code = 101 char = w;code = 119 char = ;code = 32 char = f;code = 102 char = i;code = 105 char = l;code = 108 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = s;code = 115 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = p;code = 112 char = l;code = 108 char = a;code = 97 char = c;code = 99 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = d;code = 100 char = u;code = 117 char = r;code = 114 char = i;code = 105 char = n;code = 110 char = g;code = 103 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 = o;code = 111 char = f;code = 102 char = ;code = 32 char = o;code = 111 char = l;code = 108 char = d;code = 100 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = t;code = 116 char = o;code = 111 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 = s;code = 115 char = ;code = 32 char = f;code = 102 char = o;code = 111 char = r;code = 114 char = m;code = 109 char = ;code = 32 char = a;code = 97 char = ;code = 32 char = s;code = 115 char = e;code = 101 char = d;code = 100 char = i;code = 105 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = t;code = 116 char = u;code = 117 char = b;code = 98 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 = d;code = 100 char = r;code = 114 char = a;code = 97 char = i;code = 105 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 = r;code = 114 char = e;code = 101 char = m;code = 109 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 = 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 = r;code = 114 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = a;code = 97 char = r;code = 114 char = r;code = 114 char = i;code = 105 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 = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = e;code = 101 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 = t;code = 116 char = r;code = 114 char = e;code = 101 char = a;code = 97 char = m;code = 109 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = l;code = 108 char = o;code = 111 char = c;code = 99 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = p;code = 112 char = u;code = 117 char = r;code = 114 char = i;code = 105 char = f;code = 102 char = y;code = 121 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = p;code = 112 char = l;code = 108 char = a;code = 97 char = n;code = 110 char = t;code = 116 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = f;code = 102 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = r;code = 114 char = e;code = 101 char = s;code = 115 char = h;code = 104 char = o;code = 111 char = l;code = 108 char = d;code = 100 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 = f;code = 102 char = o;code = 111 char = r;code = 114 char = ;code = 32 char = h;code = 104 char = e;code = 101 char = a;code = 97 char = v;code = 118 char = y;code = 121 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = t;code = 116 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = c;code = 99 char = l;code = 108 char = u;code = 117 char = d;code = 100 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = a;code = 97 char = r;code = 114 char = e;code = 101 char = ;code = 32 char = e;code = 101 char = x;code = 120 char = c;code = 99 char = e;code = 101 char = e;code = 101 char = d;code = 100 char = e;code = 101 char = d;code = 100 char = ,;code = 44 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = s;code = 115 char = l;code = 108 char = u;code = 117 char = d;code = 100 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = n;code = 110 char = o;code = 111 char = t;code = 116 char = ;code = 32 char = a;code = 97 char = l;code = 108 char = l;code = 108 char = o;code = 111 char = w;code = 119 char = e;code = 101 char = d;code = 100 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 = r;code = 114 char = e;code = 101 char = c;code = 99 char = y;code = 121 char = c;code = 99 char = l;code = 108 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = f;code = 102 char = e;code = 101 char = r;code = 114 char = t;code = 116 char = i;code = 105 char = l;code = 108 char = i;code = 105 char = s;code = 115 char = e;code = 101 char = r;code = 114 char = .;code = 46 char = ;code = 32 char = I;code = 73 char = n;code = 110 char = s;code = 115 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = l;code = 108 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 = n;code = 110 char = ;code = 32 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = r;code = 114 char = o;code = 111 char = v;code = 118 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = a;code = 97 char = m;code = 109 char = a;code = 97 char = l;code = 108 char = g;code = 103 char = a;code = 97 char = m;code = 109 char = -;code = 45 char = s;code = 115 char = e;code = 101 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = i;code = 105 char = n;code = 110 char = g;code = 103 char = ;code = 32 char = a;code = 97 char = p;code = 112 char = p;code = 112 char = a;code = 97 char = r;code = 114 char = a;code = 97 char = t;code = 116 char = u;code = 117 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = ;code = 32 char = d;code = 100 char = e;code = 101 char = n;code = 110 char = t;code = 116 char = a;code = 97 char = l;code = 108 char = ;code = 32 char = c;code = 99 char = l;code = 108 char = i;code = 105 char = n;code = 110 char = i;code = 105 char = c;code = 99 char = s;code = 115 char = ;code = 32 char = i;code = 105 char = s;code = 115 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = c;code = 99 char = o;code = 111 char = m;code = 109 char = m;code = 109 char = e;code = 101 char = n;code = 110 char = d;code = 100 char = e;code = 101 char = d;code = 100 char = ;code = 32 char = s;code = 115 char = o;code = 111 char = ;code = 32 char = a;code = 97 char = s;code = 115 char = ;code = 32 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = r;code = 114 char = e;code = 101 char = d;code = 100 char = u;code = 117 char = c;code = 99 char = e;code = 101 char = ;code = 32 char = c;code = 99 char = o;code = 111 char = n;code = 110 char = s;code = 115 char = i;code = 105 char = d;code = 100 char = e;code = 101 char = r;code = 114 char = a;code = 97 char = b;code = 98 char = l;code = 108 char = y;code = 121 char = ;code = 32 char = t;code = 116 char = h;code = 104 char = e;code = 101 char = ;code = 32 char = d;code = 100 char = i;code = 105 char = s;code = 115 char = c;code = 99 char = h;code = 104 char = a;code = 97 char = r;code = 114 char = g;code = 103 char = e;code = 101 char = ;code = 32 char = o;code = 111 char = f;code = 102 char = ;code = 32 char = m;code = 109 char = e;code = 101 char = r;code = 114 char = c;code = 99 char = u;code = 117 char = r;code = 114 char = y;code = 121 char = ;code = 32 char = i;code = 105 char = n;code = 110 char = t;code = 116 char = o;code = 111 char = ;code = 32 char = w;code = 119 char = a;code = 97 char = s;code = 115 char = t;code = 116 char = e;code = 101 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 = 46 char = <;code = 60 char = b;code = 98 char = r;code = 114 char = /;code = 47 char = >;code = 62 result sql = The aim of this study was to estimate mercury burden in waste water samples collected during one working day in 27 dental clinics. The samples were subjected to authorized analysis using the technique of QS-IE Enhanced Cold Vapour Mercury Analyzer to estimate the amount of mercury discharged. The mean value of mercury discharged was 2.49 parts per billion (ppb) for the clinics equipped with amalgam separators and 94.75 ppb for the clinics without amalgam separators. Some of the small amalgam particles released when new fillings are placed or during removal of old restorations form a sediment in tubes and drains. The remaining particles are carried with the waste water stream to the local purifying plant. If threshold values for heavy metal content including mercury are exceeded, the sludge is not allowed to be recycled as fertiliser. Installation of an approved amalgam-separating apparatus in dental clinics is recommended so as to reduce considerably the discharge of mercury into waste water.
Publication: SADJ 2002 Jun ;57(6)::213-5.
Publication Date: 2002 Jun
Study Author(s): al-Shraideh, M;al-Wahadni, A;Khasawneh, S;al-Shraideh, M J;
Institution: Department of Allied Dental Sciences, Jordan University of Science and Technology, PO Box 3030, Irbid-Jordan.
Shortcut link to this study:
The aim of this study was to estimate mercury burden in waste water samples collected during one working day in 27 dental clinics. The samples were subjected to authorized analysis using the technique of QS-IE Enhanced Cold Vapour Mercury Analyzer to estimate the amount of mercury discharged. The mean value of mercury discharged was 2.49 parts per billion (ppb) for the clinics equipped with amalgam separators and 94.75 ppb for the clinics without amalgam separators. Some of the small amalgam particles released when new fillings are placed or during removal of old restorations form a sediment in tubes and drains. The remaining particles are carried with the waste water stream to the local purifying plant. If threshold values for heavy metal content including mercury are exceeded, the sludge is not allowed to be recycled as fertiliser. Installation of an approved amalgam-separating apparatus in dental clinics is recommended so as to reduce considerably the discharge of mercury into waste water.
PMID: 12229075