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result sql = Mercury levels in surface waters of the Carson River-Lahontan Reservoir system, Nevada: Influence of historic mining activities.
Mercury levels in surface waters of the Carson River-Lahontan Reservoir system, Nevada: Influence of historic mining activities.
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char = e;code = 101
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char = d;code = 100
char = o;code = 111
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char = t;code = 116
char = r;code = 114
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char = a;code = 97
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char = T;code = 84
char = h;code = 104
char = e;code = 101
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
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char = d;code = 100
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char = r;code = 114
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char = c;code = 99
char = t;code = 116
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
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 = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = D;code = 68
char = );code = 41
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = w;code = 119
char = a;code = 97
char = y;code = 121
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = t;code = 116
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
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 = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
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
char = T;code = 84
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = [;code = 91
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = T;code = 84
char = ];code = 93
char = /;code = 47
char = [;code = 91
char = H;code = 72
char = g;code = 103
char = T;code = 84
char = ];code = 93
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
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 = d;code = 100
char = o;code = 111
char = w;code = 119
char = n;code = 110
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 = s;code = 115
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = e;code = 101
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = g;code = 103
char = e;code = 101
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
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = p;code = 112
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = u;code = 117
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
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 = r;code = 114
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 = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = ;code = 32
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 = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
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 = a;code = 97
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
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 = l;code = 108
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = e;code = 101
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 = c;code = 99
char = o;code = 111
char = m;code = 109
char = b;code = 98
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
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 = s;code = 115
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = b;code = 98
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = b;code = 98
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char = t;code = 116
char = h;code = 104
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char = h;code = 104
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char = g;code = 103
char = h;code = 104
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char = e;code = 101
char = l;code = 108
char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
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
char = o;code = 111
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char = s;code = 115
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char = f;code = 102
char = o;code = 111
char = u;code = 117
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char = n;code = 110
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char = w;code = 119
char = a;code = 97
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char = d;code = 100
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char = e;code = 101
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char = s;code = 115
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char = ;code = 32
char = a;code = 97
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char = o;code = 111
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char = h;code = 104
char = e;code = 101
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char = f;code = 102
char = a;code = 97
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char = t;code = 116
char = o;code = 111
char = r;code = 114
char = s;code = 115
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char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
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char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = o;code = 111
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char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = q;code = 113
char = u;code = 117
char = e;code = 101
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char = u;code = 117
char = s;code = 115
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char = g;code = 103
char = e;code = 101
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char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = y;code = 121
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = .;code = 46
char = ;code = 32
char = C;code = 67
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
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char = t;code = 116
char = r;code = 114
char = a;code = 97
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char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = T;code = 84
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
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char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = c;code = 99
char = o;code = 111
char = l;code = 108
char = u;code = 117
char = m;code = 109
char = n;code = 110
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char = a;code = 97
char = p;code = 112
char = p;code = 112
char = e;code = 101
char = a;code = 97
char = r;code = 114
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 = e;code = 101
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 = b;code = 98
char = y;code = 121
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char = i;code = 105
char = n;code = 110
char = p;code = 112
char = u;code = 117
char = t;code = 116
char = s;code = 115
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char = o;code = 111
char = f;code = 102
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 = p;code = 112
char = a;code = 97
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = c;code = 99
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char = e;code = 101
char = s;code = 115
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char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = s;code = 115
char = h;code = 104
char = e;code = 101
char = d;code = 100
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char = d;code = 100
char = u;code = 117
char = r;code = 114
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char = p;code = 112
char = r;code = 114
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char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = n;code = 110
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = l;code = 108
char = t;code = 116
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
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char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
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char = v;code = 118
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char = ,;code = 44
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char = i;code = 105
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char = o;code = 111
char = s;code = 115
char = s;code = 115
char = e;code = 101
char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = g;code = 103
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char = f;code = 102
char = r;code = 114
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char = m;code = 109
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char = t;code = 116
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char = a;code = 97
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char = e;code = 101
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char = l;code = 108
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char = m;code = 109
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char = r;code = 114
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char = o;code = 111
char = b;code = 98
char = s;code = 115
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char = r;code = 114
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
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char = a;code = 97
char = d;code = 100
char = d;code = 100
char = i;code = 105
char = t;code = 116
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char = o;code = 111
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char = o;code = 111
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char = l;code = 108
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char = s;code = 115
char = s;code = 115
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char = f;code = 102
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char = g;code = 103
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char = i;code = 105
char = c;code = 99
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char = e;code = 101
char = s;code = 115
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char = s;code = 115
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char = ,;code = 44
char = ;code = 32
char = t;code = 116
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char = e;code = 101
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char = r;code = 114
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char = m;code = 109
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = l;code = 108
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char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = v;code = 118
char = o;code = 111
char = l;code = 108
char = a;code = 97
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char = i;code = 105
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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
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char = o;code = 111
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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 = g;code = 103
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
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char = a;code = 97
char = n;code = 110
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char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = a;code = 97
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char = p;code = 112
char = a;code = 97
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char = h;code = 104
char = w;code = 119
char = a;code = 97
char = y;code = 121
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
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result sql = Total mercury (HgT), methylmercury (MeHg), and other operationally defined Hg species were determined on water samples collected from a river-reservoir system impacted by historic mine wastes. Simultaneously, a comprehensive study was undertaken to determine the influence of some major physico-chemical parameters on the fate of Hg within the system. Total Hg levels showed an increase from background concentrations of 4 ng liter(-1) upstream of mining activity, to peak values of 1500-2100 ng liter(-1) downstream of Hg contaminated mine tailings piles. MeHg concentrations varied from 0.1 to 7 ng liter(-1) in surface waters. In both cases, peak values were associated with the highest concentrations of total suspended solids (TSS). Particulate Hg (HgP) was typically >50% of HgT and increased downstream. The dissolved fraction of MeHg (MeHgD) always constituted a large portion of total methylmercury (MeHgT). The [MeHgT]/[HgT] ratio decreased downstream suggesting either a high percentage of inorganic Hg input from point sources, or low specific rates of MeHg production within the aquatic system. The latter could be due to the combined effects on microbial populations of both high levels of Hg concentrations found in water and sediments, and other factors related to the aqueous geochemistry of the system. Concentrations of HgT in the water column appeared to be enhanced by inputs of contaminated particles from the watershed during spring snow melt. In the reservoir, significant losses of Hg from the water column were observed. In addition to losses of Hg bound to particles by sedimentation, the removal through volatilization of dissolved gaseous Hg could be an important pathway.

Publication: Environ. Pollut. 1996 ;92(2)::193-201.
Publication Date: 1996
Study Author(s): Bonzongo, J C;Heim, K J;Warwick, J J;Lyons, W B;
Institution: Center for Environmental Sciences and Engineering, MS. 199, University of Nevada, Reno, NV 89557-0014, USA.
Shortcut link to this study:
Total mercury (HgT), methylmercury (MeHg), and other operationally defined Hg species were determined on water samples collected from a river-reservoir system impacted by historic mine wastes. Simultaneously, a comprehensive study was undertaken to determine the influence of some major physico-chemical parameters on the fate of Hg within the system. Total Hg levels showed an increase from background concentrations of 4 ng liter(-1) upstream of mining activity, to peak values of 1500-2100 ng liter(-1) downstream of Hg contaminated mine tailings piles. MeHg concentrations varied from 0.1 to 7 ng liter(-1) in surface waters. In both cases, peak values were associated with the highest concentrations of total suspended solids (TSS). Particulate Hg (HgP) was typically >50% of HgT and increased downstream. The dissolved fraction of MeHg (MeHgD) always constituted a large portion of total methylmercury (MeHgT). The [MeHgT]/[HgT] ratio decreased downstream suggesting either a high percentage of inorganic Hg input from point sources, or low specific rates of MeHg production within the aquatic system. The latter could be due to the combined effects on microbial populations of both high levels of Hg concentrations found in water and sediments, and other factors related to the aqueous geochemistry of the system. Concentrations of HgT in the water column appeared to be enhanced by inputs of contaminated particles from the watershed during spring snow melt. In the reservoir, significant losses of Hg from the water column were observed. In addition to losses of Hg bound to particles by sedimentation, the removal through volatilization of dissolved gaseous Hg could be an important pathway.
PMID: 15091399

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