char = I;code = 73
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
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char = n;code = 110
char = c;code = 99
char = e;code = 101
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char = o;code = 111
char = f;code = 102
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char = s;code = 115
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char = l;code = 108
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char = e;code = 101
char = d;code = 100
char = ;code = 32
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char = e;code = 101
char = u;code = 117
char = t;code = 116
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = m;code = 109
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char = r;code = 114
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
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char = d;code = 100
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char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = ;code = 32
char = m;code = 109
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char = c;code = 99
char = u;code = 117
char = r;code = 114
char = y;code = 121
char = ;code = 32
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char = c;code = 99
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
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char = n;code = 110
char = t;code = 116
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
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char = e;code = 101
char = d;code = 100
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
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char = t;code = 116
char = s;code = 115
char = .;code = 46
result sql = Importance of dissolved neutral mercury sulfides for methyl mercury production in contaminated sediments.
Importance of dissolved neutral mercury sulfides for methyl mercury production in contaminated sediments.
char = B;code = 66
char = i;code = 105
char = o;code = 111
char = t;code = 116
char = i;code = 105
char = c;code = 99
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char = t;code = 116
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char = a;code = 97
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char = s;code = 115
char = f;code = 102
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char = m;code = 109
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 = i;code = 105
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = g;code = 103
char = a;code = 97
char = n;code = 110
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char = c;code = 99
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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 = 44
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = (;code = 40
char = I;code = 73
char = I;code = 73
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
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 = (;code = 40
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
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char = ;code = 32
char = i;code = 105
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char = p;code = 112
char = o;code = 111
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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 = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = l;code = 108
char = y;code = 121
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 = b;code = 98
char = y;code = 121
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = v;code = 118
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 = n;code = 110
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = x;code = 120
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = b;code = 98
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 = a;code = 97
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = R;code = 82
char = B;code = 66
char = );code = 41
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 = 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 = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
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char = e;code = 101
char = c;code = 99
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 = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = (;code = 40
char = I;code = 73
char = I;code = 73
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = n;code = 110
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char = l;code = 108
char = o;code = 111
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char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
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 = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = v;code = 118
char = i;code = 105
char = r;code = 114
char = o;code = 111
char = n;code = 110
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
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 = (;code = 40
char = i;code = 105
char = );code = 41
char = ;code = 32
char = b;code = 98
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = k;code = 107
char = i;code = 105
char = s;code = 115
char = h;code = 104
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 = 44
char = ;code = 32
char = (;code = 40
char = i;code = 105
char = i;code = 105
char = );code = 41
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = -;code = 45
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = h;code = 104
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = (;code = 40
char = i;code = 105
char = i;code = 105
char = i;code = 105
char = );code = 41
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = -;code = 45
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = h;code = 104
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
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 = 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 = H;code = 72
char = g;code = 103
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
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 = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = u;code = 117
char = b;code = 98
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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char = a;code = 97
char = t;code = 116
char = ;code = 32
char = 2;code = 50
char = 3;code = 51
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = C;code = 67
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 4;code = 52
char = 8;code = 56
char = ;code = 32
char = h;code = 104
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 = N;code = 78
char = 2;code = 50
char = (;code = 40
char = g;code = 103
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
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char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
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char = n;code = 110
char = t;code = 116
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char = a;code = 97
char = t;code = 116
char = i;code = 105
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char = ;code = 32
char = i;code = 105
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char = s;code = 115
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char = i;code = 105
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char = s;code = 115
char = .;code = 46
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char = P;code = 80
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char = s;code = 115
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char = c;code = 99
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char = a;code = 97
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char = i;code = 105
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char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = o;code = 111
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char = e;code = 101
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = s;code = 115
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char = d;code = 100
char = e;code = 101
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char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = H;code = 72
char = g;code = 103
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char = c;code = 99
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char = p;code = 112
char = l;code = 108
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char = x;code = 120
char = e;code = 101
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char = w;code = 119
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char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = a;code = 97
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char = o;code = 111
char = r;code = 114
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char = a;code = 97
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char = i;code = 105
char = c;code = 99
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char = t;code = 116
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char = i;code = 105
char = o;code = 111
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = [;code = 91
char = H;code = 72
char = g;code = 103
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char = S;code = 83
char = R;code = 82
char = );code = 41
char = 2;code = 50
char = (;code = 40
char = a;code = 97
char = q;code = 113
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
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 = d;code = 100
char = i;code = 105
char = s;code = 115
char = s;code = 115
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char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = r;code = 114
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char = a;code = 97
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char = i;code = 105
char = c;code = 99
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ];code = 93
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = i;code = 105
char = d;code = 100
char = e;code = 101
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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 = u;code = 117
char = m;code = 109
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char = f;code = 102
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char = a;code = 97
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char = m;code = 109
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char = c;code = 99
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char = y;code = 121
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char = l;code = 108
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char = i;code = 105
char = d;code = 100
char = e;code = 101
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char = g;code = 103
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char = S;code = 83
char = H;code = 72
char = );code = 41
char = 2;code = 50
char = 0;code = 48
char = (;code = 40
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char = q;code = 113
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char = ];code = 93
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char = H;code = 72
char = g;code = 103
char = S;code = 83
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char = (;code = 40
char = a;code = 97
char = q;code = 113
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char = ];code = 93
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char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
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char = t;code = 116
char = l;code = 108
char = y;code = 121
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char = ;code = 32
char = p;code = 112
char = o;code = 111
char = s;code = 115
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char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = (;code = 40
char = p;code = 112
char = ;code = 32
char = <;code = 60
char = ;code = 32
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char = 0;code = 48
char = 0;code = 48
char = 1;code = 49
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = ;code = 32
char = =;code = 61
char = ;code = 32
char = 2;code = 50
char = 0;code = 48
char = );code = 41
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
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 = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
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 = r;code = 114
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 = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = (;code = 40
char = K;code = 75
char = m;code = 109
char = ,;code = 44
char = ;code = 32
char = d;code = 100
char = a;code = 97
char = y;code = 121
char = (;code = 40
char = -;code = 45
char = 1;code = 49
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char = );code = 41
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = h;code = 104
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 5;code = 53
char = -;code = 45
char = 1;code = 49
char = 0;code = 48
char = 0;code = 48
char = ;code = 32
char = c;code = 99
char = m;code = 109
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = w;code = 119
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = k;code = 107
char = i;code = 105
char = s;code = 115
char = h;code = 104
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 = 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 = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
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 = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = (;code = 40
char = S;code = 83
char = R;code = 82
char = );code = 41
char = 2;code = 50
char = (;code = 40
char = a;code = 97
char = q;code = 113
char = );code = 41
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = r;code = 114
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 = g;code = 103
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
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 = s;code = 115
char = h;code = 104
char = i;code = 105
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = K;code = 75
char = m;code = 109
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = w;code = 119
char = o;code = 111
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = e;code = 101
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = h;code = 104
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 = 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 = s;code = 115
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
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 = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = i;code = 105
char = d;code = 100
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 = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
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 = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = r;code = 114
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 = 44
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 = r;code = 114
char = e;code = 101
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = o;code = 111
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char = g;code = 103
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
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char = r;code = 114
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char = l;code = 108
char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = s;code = 115
char = h;code = 104
char = i;code = 105
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = K;code = 75
char = m;code = 109
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 = u;code = 117
char = m;code = 109
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = [;code = 91
char = H;code = 72
char = g;code = 103
char = (;code = 40
char = S;code = 83
char = H;code = 72
char = );code = 41
char = 2;code = 50
char = 0;code = 48
char = (;code = 40
char = a;code = 97
char = q;code = 113
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char = ];code = 93
char = ;code = 32
char = a;code = 97
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char = d;code = 100
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char = [;code = 91
char = H;code = 72
char = g;code = 103
char = S;code = 83
char = 0;code = 48
char = (;code = 40
char = a;code = 97
char = q;code = 113
char = );code = 41
char = ];code = 93
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
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char = t;code = 116
char = l;code = 108
char = y;code = 121
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char = ;code = 32
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = c;code = 99
char = o;code = 111
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char = r;code = 114
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char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
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char = a;code = 97
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char = i;code = 105
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char = n;code = 110
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char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
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char = (;code = 40
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = g;code = 103
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char = k;code = 107
char = g;code = 103
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char = 1;code = 49
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char = i;code = 105
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char = b;code = 98
char = r;code = 114
char = a;code = 97
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char = k;code = 107
char = i;code = 105
char = s;code = 115
char = h;code = 104
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char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = p;code = 112
char = ;code = 32
char = <;code = 60
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 0;code = 48
char = 1;code = 49
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char = ;code = 32
char = n;code = 110
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char = =;code = 61
char = ;code = 32
char = 2;code = 50
char = 3;code = 51
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char = ,;code = 44
char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = s;code = 115
char = o;code = 111
char = u;code = 117
char = t;code = 116
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char = e;code = 101
char = r;code = 114
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char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = -;code = 45
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char = u;code = 117
char = c;code = 99
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char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
char = y;code = 121
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char = f;code = 102
char = r;code = 114
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char = s;code = 115
char = h;code = 104
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
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char = p;code = 112
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char = <;code = 60
char = ;code = 32
char = 0;code = 48
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char = 0;code = 48
char = 0;code = 48
char = 1;code = 49
char = ,;code = 44
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char = ,;code = 44
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char = a;code = 97
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char = a;code = 97
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char = 0;code = 48
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char = ;code = 32
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char = T;code = 84
char = h;code = 104
char = e;code = 101
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char = s;code = 115
char = l;code = 108
char = o;code = 111
char = p;code = 112
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char = (;code = 40
char = b;code = 98
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char = b;code = 98
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char = f;code = 102
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char = e;code = 101
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char = a;code = 97
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char = i;code = 105
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char = i;code = 105
char = p;code = 112
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char = K;code = 75
char = m;code = 109
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char = (;code = 40
char = d;code = 100
char = a;code = 97
char = y;code = 121
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char = =;code = 61
char = ;code = 32
char = a;code = 97
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char = +;code = 43
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char = b;code = 98
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char = [;code = 91
char = H;code = 72
char = g;code = 103
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char = S;code = 83
char = H;code = 72
char = );code = 41
char = 2;code = 50
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char = (;code = 40
char = a;code = 97
char = q;code = 113
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char = ];code = 93
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char = [;code = 91
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char = g;code = 103
char = S;code = 83
char = 0;code = 48
char = (;code = 40
char = a;code = 97
char = q;code = 113
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char = ];code = 93
char = );code = 41
char = ;code = 32
char = a;code = 97
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char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = (;code = 40
char = m;code = 109
char = i;code = 105
char = c;code = 99
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char = o;code = 111
char = g;code = 103
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char = k;code = 107
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char = -;code = 45
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char = =;code = 61
char = ;code = 32
char = a;code = 97
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char = ;code = 32
char = +;code = 43
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char = b;code = 98
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char = (;code = 40
char = [;code = 91
char = H;code = 72
char = g;code = 103
char = (;code = 40
char = S;code = 83
char = H;code = 72
char = );code = 41
char = 2;code = 50
char = 0;code = 48
char = (;code = 40
char = a;code = 97
char = q;code = 113
char = );code = 41
char = ];code = 93
char = ;code = 32
char = +;code = 43
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char = [;code = 91
char = H;code = 72
char = g;code = 103
char = S;code = 83
char = 0;code = 48
char = (;code = 40
char = a;code = 97
char = q;code = 113
char = );code = 41
char = ];code = 93
char = );code = 41
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
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char = a;code = 97
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char = i;code = 105
char = n;code = 110
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = e;code = 101
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char = r;code = 114
char = e;code = 101
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 = s;code = 115
char = h;code = 104
char = i;code = 105
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result sql = Biotic transformation of inorganic mercury, Hg(II), to mono methyl mercury (MeHg) is proposed to be largely controlled by passive uptake of neutral Hg complexes by sulfate reducing bacteria (SRB). In this study, the chemical speciation of Hg(II) in seven locally contaminated sediments covering environments such as (i) brackish water, (ii) low-productivity freshwater, and, (iii) high-productivity freshwater was related to potential Hg methylation rates, determined by incubation at 23 degrees C for 48 h under N2(g), and to total MeHg concentrations in sediments. Pore water speciation was modeled considering Hg complexes with halides, organic thiols [Hg(SR)2(aq), associated to dissolved organic matter], monosulfides, and bisulfides. The sum of neutral mercury sulfides [Hg(SH)20(aq)] and [HgS0(aq)] was significantly, positively (p < 0.001, n = 20) correlated to the specific methylation rate constant (Km, day(-1)) at depths of 5-100 cm in two brackish water sediments. Total Hg, total mercury sulfides or Hg(SR)2(aq) in pore water gave no significant relationships with Km. In two subsets of freshwater sediments, neutral mercury sulfides were positively correlated to total Hg in pore water, and therefore, total Hg also gave significant relationships with Km. The sum of [Hg(SH)20(aq)] and [HgS0(aq)] was significantly, positively correlated to total sediment MeHg (microg kg-1) in brackish waters (p < 0.001, n = 23), in southern, high-productivity freshwaters (p < 0.001, n = 20), as well as in northern, low-productivity freshwater (p = 0.048, n = 6). The slopes (b, b') of the relationships Km (day-1) = a + b([Hg(SH)20(aq)] + [HgS0(aq)]) and MeHg (microg kg-1) = a' + b'([Hg(SH)20(aq)] + [HgS0(aq)]) showed an inverse relationship with the C/N ratio, supposedly reflecting differences in primary production and energy-rich organic matter availability among sites. We conclude that concentrations of neutral inorganic mercury sulfide species, together with the availability of energy-rich organic matter, largely control Hg methylation rates in contaminated sediments. Furthermore, Hg(SH)20(aq) is suggested to be the dominant species taken up by MeHg producing bacteria in organic-rich sediments without formation of HgS(s).

Publication: Environ. Sci. Technol. 2007 Apr 1 ;41(7)::2270-6.
Publication Date: 2007 Apr 1
Study Author(s): Drott, Andreas;Lambertsson, Lars;Björn, Erik;Skyllberg, Ulf;
Institution: Department of Forest Ecology, Swedish University of Agricultural Sciences, S-90183 Umeå, Sweden.
Shortcut link to this study:
Biotic transformation of inorganic mercury, Hg(II), to mono methyl mercury (MeHg) is proposed to be largely controlled by passive uptake of neutral Hg complexes by sulfate reducing bacteria (SRB). In this study, the chemical speciation of Hg(II) in seven locally contaminated sediments covering environments such as (i) brackish water, (ii) low-productivity freshwater, and, (iii) high-productivity freshwater was related to potential Hg methylation rates, determined by incubation at 23 degrees C for 48 h under N2(g), and to total MeHg concentrations in sediments. Pore water speciation was modeled considering Hg complexes with halides, organic thiols [Hg(SR)2(aq), associated to dissolved organic matter], monosulfides, and bisulfides. The sum of neutral mercury sulfides [Hg(SH)20(aq)] and [HgS0(aq)] was significantly, positively (p < 0.001, n = 20) correlated to the specific methylation rate constant (Km, day(-1)) at depths of 5-100 cm in two brackish water sediments. Total Hg, total mercury sulfides or Hg(SR)2(aq) in pore water gave no significant relationships with Km. In two subsets of freshwater sediments, neutral mercury sulfides were positively correlated to total Hg in pore water, and therefore, total Hg also gave significant relationships with Km. The sum of [Hg(SH)20(aq)] and [HgS0(aq)] was significantly, positively correlated to total sediment MeHg (microg kg-1) in brackish waters (p < 0.001, n = 23), in southern, high-productivity freshwaters (p < 0.001, n = 20), as well as in northern, low-productivity freshwater (p = 0.048, n = 6). The slopes (b, b') of the relationships Km (day-1) = a + b([Hg(SH)20(aq)] + [HgS0(aq)]) and MeHg (microg kg-1) = a' + b'([Hg(SH)20(aq)] + [HgS0(aq)]) showed an inverse relationship with the C/N ratio, supposedly reflecting differences in primary production and energy-rich organic matter availability among sites. We conclude that concentrations of neutral inorganic mercury sulfide species, together with the availability of energy-rich organic matter, largely control Hg methylation rates in contaminated sediments. Furthermore, Hg(SH)20(aq) is suggested to be the dominant species taken up by MeHg producing bacteria in organic-rich sediments without formation of HgS(s).
PMID: 17438774

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