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Methylation Index and Analysis of SRB-Mediated Mercury Methylation

​
particulate organic carbon (μM/L)
1
sediment ox-red potential (mV)
1
mobile mercury concentration (μM/L)
1
methylation rate constant k
0.06
saturation constant a
0.25
​
​
​
Mercury methylation is a process by which Hg bio-accumulates in ecosystems. The methylation index is a parameter correlated with methylmercury (MeHg) concentration in water bodies based on sulfur-reducing bacteria (SRB), particulate organic carbon (POC), sediment oxidation-reduction potential and mobile mercury concentration. The Michaelis–Menten equation for MeHg leads to an alternate comparison, in terms of
a
, the MeHg saturation constant;
k
, the half-saturation methylation constant; and
Hg
T
, total sedimentary mercury. In Graph 2, river POC is estimated as 56
μ
M/L, estuarine POC is estimated as 6
μ
M/L, and seawater is estimated as 0.3
μ
M/L. Graph 3 also displays the limit of MeHg formation in the system as mobile mercury concentration increases.
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