Abstract
A method for the removal of mercury sulfide from mercury-contaminated sediments was developed, which consists of chemical leaching and volatilization of mercury by bacteria. More than 85% of the mercury in sediment containing 0.11-37.4 mg/kg of mercury was efficiently extracted with 3 M HCl and 74 mM FeCl3. Subsequent volatilization by bacteria resulted in the removal of 62.9-75.1% of mercury from mercury-contaminated Minamata Bay sediments. Methylmercury was also eliminated from soil at a high efficiency. Thus, this combined method of chemical and microbial treatments could be used for efficient removal of both organic and inorganic mercurials from natural sediments.
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