|
|
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result sql = Pathway-dependent isotope fractionation during aerobic and anaerobic degradation of monochlorobenzene and 1,2,4-trichlorobenzene.
Pathway-dependent isotope fractionation during aerobic and anaerobic degradation of monochlorobenzene and 1,2,4-trichlorobenzene.char = S;code = 83
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result sql = Stable carbon isotope fractionation is a valuable tool for monitoring natural attenuation and to establish the fate of groundwater contaminants. In this study, we measured carbon isotope fractionation during aerobic and anaerobic degradation of two chlorinated benzenes: monochlorobenzene (MCB) and 1,2,4-trichlorobenzene (1,2,4-TCB). MCB isotope fractionation was measured in anaerobic methanogenic microcosms, while 1,2,4-TCB isotope experiments were carried out in both aerobic and anaerobic microcosms. Large isotope fractionation was observed in both the anaerobic microcosm experiments. Enrichment factors (ε) for anaerobic reductive dechlorination of MCB and 1,2,4-TCB were -5.0‰ ± 0.2‰ and -3.0‰ ± 0.4‰, respectively. In contrast, no significant isotope fractionation was found during aerobic microbial degradation of 1,2,4-TCB. The cleavage of a C-Cl σ bond occurs during anaerobic reductive dechlorination of MCB and 1,2,4-TCB, while no σ bond cleavage is involved during aerobic degradation via dioxygenase. The difference in isotope fractionation for aerobic versus anaerobic biodegradation of MCB and 1,2,4-TCB can be explained by the difference in the initial step of aerobic versus anaerobic biodegradation pathways.
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char = e;code = 101
char = n;code = 110
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char = d;code = 100
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char = 2;code = 50
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char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = l;code = 108
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char = r;code = 114
char = o;code = 111
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char = e;code = 101
char = n;code = 110
char = z;code = 122
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = .;code = 46
result sql = Pathway-dependent isotope fractionation during aerobic and anaerobic degradation of monochlorobenzene and 1,2,4-trichlorobenzene.
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char = n;code = 110
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char = s;code = 115
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char = c;code = 99
char = h;code = 104
char = l;code = 108
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char = o;code = 111
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char = e;code = 101
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char = e;code = 101
char = n;code = 110
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char = M;code = 77
char = C;code = 67
char = B;code = 66
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char = ;code = 32
char = a;code = 97
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char = ,;code = 44
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char = o;code = 111
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char = 1;code = 49
char = ,;code = 44
char = 2;code = 50
char = ,;code = 44
char = 4;code = 52
char = -;code = 45
char = T;code = 84
char = C;code = 67
char = B;code = 66
char = );code = 41
char = .;code = 46
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char = M;code = 77
char = C;code = 67
char = B;code = 66
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char = i;code = 105
char = s;code = 115
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char = t;code = 116
char = o;code = 111
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char = e;code = 101
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char = f;code = 102
char = r;code = 114
char = a;code = 97
char = c;code = 99
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char = o;code = 111
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char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = a;code = 97
char = s;code = 115
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char = m;code = 109
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char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
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char = d;code = 100
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char = a;code = 97
char = n;code = 110
char = a;code = 97
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char = r;code = 114
char = o;code = 111
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char = i;code = 105
char = c;code = 99
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char = m;code = 109
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char = t;code = 116
char = h;code = 104
char = a;code = 97
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char = o;code = 111
char = g;code = 103
char = e;code = 101
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char = i;code = 105
char = c;code = 99
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char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
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char = c;code = 99
char = o;code = 111
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char = m;code = 109
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
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char = 1;code = 49
char = ,;code = 44
char = 2;code = 50
char = ,;code = 44
char = 4;code = 52
char = -;code = 45
char = T;code = 84
char = C;code = 67
char = B;code = 66
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = t;code = 116
char = o;code = 111
char = p;code = 112
char = e;code = 101
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char = e;code = 101
char = x;code = 120
char = p;code = 112
char = e;code = 101
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char = i;code = 105
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
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char = w;code = 119
char = e;code = 101
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 = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = b;code = 98
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char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = b;code = 98
char = i;code = 105
char = c;code = 99
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = e;code = 101
char = r;code = 114
char = o;code = 111
char = b;code = 98
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = r;code = 114
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char = c;code = 99
char = o;code = 111
char = s;code = 115
char = m;code = 109
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = L;code = 76
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
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char = i;code = 105
char = s;code = 115
char = o;code = 111
char = t;code = 116
char = o;code = 111
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char = e;code = 101
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char = f;code = 102
char = r;code = 114
char = a;code = 97
char = c;code = 99
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char = i;code = 105
char = o;code = 111
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char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = o;code = 111
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char = s;code = 115
char = e;code = 101
char = r;code = 114
char = v;code = 118
char = e;code = 101
char = d;code = 100
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char = i;code = 105
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char = b;code = 98
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = a;code = 97
char = e;code = 101
char = r;code = 114
char = o;code = 111
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char = i;code = 105
char = c;code = 99
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char = m;code = 109
char = i;code = 105
char = c;code = 99
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char = c;code = 99
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char = s;code = 115
char = m;code = 109
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char = e;code = 101
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char = E;code = 69
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char = i;code = 105
char = c;code = 99
char = h;code = 104
char = m;code = 109
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char = t;code = 116
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char = f;code = 102
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
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char = s;code = 115
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char = &;code = 38
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char = 9;code = 57
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char = a;code = 97
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char = o;code = 111
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char = c;code = 99
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char = i;code = 105
char = o;code = 111
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char = M;code = 77
char = C;code = 67
char = B;code = 66
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char = -;code = 45
char = T;code = 84
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char = B;code = 66
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char = w;code = 119
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char = ;code = 32
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char = &;code = 38
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char = ,;code = 44
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char = v;code = 118
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char = I;code = 73
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char = c;code = 99
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char = 2;code = 50
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char = -;code = 45
char = T;code = 84
char = C;code = 67
char = B;code = 66
char = .;code = 46
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char = T;code = 84
char = h;code = 104
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char = C;code = 67
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char = C;code = 67
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char = B;code = 66
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char = T;code = 84
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char = w;code = 119
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char = a;code = 97
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char = M;code = 77
char = C;code = 67
char = B;code = 66
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char = a;code = 97
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char = 1;code = 49
char = ,;code = 44
char = 2;code = 50
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char = -;code = 45
char = T;code = 84
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char = B;code = 66
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
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result sql = Stable carbon isotope fractionation is a valuable tool for monitoring natural attenuation and to establish the fate of groundwater contaminants. In this study, we measured carbon isotope fractionation during aerobic and anaerobic degradation of two chlorinated benzenes: monochlorobenzene (MCB) and 1,2,4-trichlorobenzene (1,2,4-TCB). MCB isotope fractionation was measured in anaerobic methanogenic microcosms, while 1,2,4-TCB isotope experiments were carried out in both aerobic and anaerobic microcosms. Large isotope fractionation was observed in both the anaerobic microcosm experiments. Enrichment factors (ε) for anaerobic reductive dechlorination of MCB and 1,2,4-TCB were -5.0‰ ± 0.2‰ and -3.0‰ ± 0.4‰, respectively. In contrast, no significant isotope fractionation was found during aerobic microbial degradation of 1,2,4-TCB. The cleavage of a C-Cl σ bond occurs during anaerobic reductive dechlorination of MCB and 1,2,4-TCB, while no σ bond cleavage is involved during aerobic degradation via dioxygenase. The difference in isotope fractionation for aerobic versus anaerobic biodegradation of MCB and 1,2,4-TCB can be explained by the difference in the initial step of aerobic versus anaerobic biodegradation pathways.
Publication: Environ. Sci. Technol. 2011 Oct 1 ;45(19)::8321-7. :doi: 10.1021/es201224x.
Publication Date: 2011 Oct 1
Study Author(s): Liang, Xiaoming;Howlett, Michael R;Nelson, Jennifer L;Grant, Gavin;Dworatzek, Sandra;Lacrampe-Couloume, Georges;Zinder, Stephen H;Edwards, Elizabeth A;Sherwood Lollar, Barbara;
Institution: Department of Geology, University of Toronto , Toronto, Ontario M5S 3B1, Canada.
Shortcut link to this study:
Publication Date: 2011 Oct 1
Study Author(s): Liang, Xiaoming;Howlett, Michael R;Nelson, Jennifer L;Grant, Gavin;Dworatzek, Sandra;Lacrampe-Couloume, Georges;Zinder, Stephen H;Edwards, Elizabeth A;Sherwood Lollar, Barbara;
Institution: Department of Geology, University of Toronto , Toronto, Ontario M5S 3B1, Canada.
Shortcut link to this study:
Stable carbon isotope fractionation is a valuable tool for monitoring natural attenuation and to establish the fate of groundwater contaminants. In this study, we measured carbon isotope fractionation during aerobic and anaerobic degradation of two chlorinated benzenes: monochlorobenzene (MCB) and 1,2,4-trichlorobenzene (1,2,4-TCB). MCB isotope fractionation was measured in anaerobic methanogenic microcosms, while 1,2,4-TCB isotope experiments were carried out in both aerobic and anaerobic microcosms. Large isotope fractionation was observed in both the anaerobic microcosm experiments. Enrichment factors (ε) for anaerobic reductive dechlorination of MCB and 1,2,4-TCB were -5.0‰ ± 0.2‰ and -3.0‰ ± 0.4‰, respectively. In contrast, no significant isotope fractionation was found during aerobic microbial degradation of 1,2,4-TCB. The cleavage of a C-Cl σ bond occurs during anaerobic reductive dechlorination of MCB and 1,2,4-TCB, while no σ bond cleavage is involved during aerobic degradation via dioxygenase. The difference in isotope fractionation for aerobic versus anaerobic biodegradation of MCB and 1,2,4-TCB can be explained by the difference in the initial step of aerobic versus anaerobic biodegradation pathways.
PMID: 21851082
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