Title of article :
Effects of sulfate reducing bacteria and sulfate concentrations on mercury methylation in freshwater sediments Original Research Article
Author/Authors :
Dingding Shao، نويسنده , , Yuan Kang، نويسنده , , Shengchun Wu، نويسنده , , Jiemin Cheng and Ming H. Wong، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Pages :
6
From page :
331
To page :
336
Abstract :
Methylmercury (MeHg) is the most poisonous form of mercury (Hg) and it enters the human body primarily through consumption of Hg contaminated fish. Sulfate reducing bacteria (SRB) are major producers of MeHg in anoxic sediments. The dsrAB gene was isolated from freshwater fish pond sediments. Sequence analyses showed that the SRB in sediments was mainly composed of Desulfobulbus propionicus and Desulfovibrio vulgaris. The two species of SRB were cultured from freshwater sediments. The addition of inorganic Hg to these freshwater sediments caused an increase in MeHg concentrations at 30 days incubation. MeHg levels were sensitive to sulfate concentrations; a medium sulfate level (0.11 mg/g) produced higher levels than treatments lacking sulfate addition or when amended with 0.55 mg/g. Assessment of bacterial levels by PCR measurements of microbial DNA indicated that the MeHg levels were correlated with cell growth.
Keywords :
Methylmercury , Sulfate amendment , Sulfate reducing bacteria , DNA quantification
Journal title :
Science of the Total Environment
Serial Year :
2012
Journal title :
Science of the Total Environment
Record number :
988328
Link To Document :
بازگشت