Environmental Engineering Reference
In-Depth Information
table 4.4
Mercury Isotope Fractionation During Chemical Reactions and Phase Transfer Processes
Maximum observed
deviation in ‰
Process
202
Hg
199
Hg
201
Hg
202/198
Values
Reference
Microbial reduction
Reactant
6.16
NR
a
NR
1.0013
1.0020
Kritee et al., 2007
Product
2.56
NR
NR
Photoreduction, reactant
2.24
2.15
2.16
0.9994
Bergquist and
Blum, 2007
Photoreduction
Reactant
0.46
2.21
1.77
Zheng and
Hintelmann, 2009
Product
1.20
7.74
6.27
Dark reduction
Reactant
0.09
ND
b
ND
Product
1.89
0.20
0.18
Abiotic reduction, reactant
5.58
NR
NR
1.0011
Photodemethylation
0.36
1.67
1.21
0.9983
0.9987
Bergquist and Blum,
2007
DGHg volatilization
Reactant
1.50
ND
ND
1.00044
1.00047
Zheng et al., 2007
Product
0.75
ND
ND
Evaporation
Liquid to gas
0.86
NR
NR
1.0062
1.0068
Estrade et al., 2008
Liquid to gas
0.93
ND
ND
Sonke et al., 2008
Methylation
1.40
NR
NR
Dzurko, 2006
Octanol/water partitioning
2.43
ND
ND
Octanol
Malinovsky et al.,
2008
Water
0.28
ND
ND
Creatine kinase, reaction with MeHg
422
781
578
Buchachenko et al.,
2004
NOTE
: Deviations are expressed relative to the starting material of the reaction or transfer process.
DGHg
not reported.
a.
Authors did not provide data to evaluate whether mass, independent fractionation exists.
b.
Authors tested for, but did not observe, any mass, independent fractionation.
dissolved gaseous mercury; ND
not detected; NR
