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首页> 外文期刊>Environmental Science & Technology >Methylmercury Formation in a Wetland Mesocosm Amended with Sulfate
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Methylmercury Formation in a Wetland Mesocosm Amended with Sulfate

机译：用硫酸盐修正的湿地中膜中的甲基汞形成

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摘要

This study used an experimental model to evaluate methylmercury accumulation when the soil of a constructed wetland is amended with sulfate. The model was planted with Schoenoplectus californicus and designed to reduce wastestream metals and metal-related toxicity. The soil was varied during construction to provide a control and two sulfate treatments which were equally efficient at overall mercury and copper removal. After an initial stabilization period, methylmercury concentrations in porewater were up to three times higher in the sulfate-treated porewater (0.5-1.6 ng/L) than in the control (<0.02-0.5 ng/L). Mean percent methylmercury was 9.0% in the control with 18.5 and 16.6% in the low- and high-sulfate treatments, respectively. Methylmercury concentrations measured in mesocosm surface water did not reflect the differences between the control and the sulfate treatments that were noted in porewater. The mean bulk sediment methylmercury concentration in the top 6 cm of the low-sulfate treatment (2.33 ng/g) was significantly higher than other treatment means which ranged from 0.96 to 1.57 ng/g. Total mercury in sediment ranged from 20.8 to 33.4 ng/g, with no differences between treatments. Results suggest thatthe non-sulfate-amended control was equally effective in removing metals while keeping mercury methylation low.
机译：本研究使用实验模型评估了人工湿地土壤中硫酸盐改良后甲基汞的积累。该模型种植了加州分枝杆菌（Schoenoplectus californicus），旨在减少废金属和与金属有关的毒性。施工期间土壤变化以提供控制和两种硫酸盐处理，它们在去除汞和铜方面同样有效。经过最初的稳定期后，硫酸盐处理过的孔隙水中（0.5-1.6 ng / L）中孔隙水中甲基汞的浓度比对照（<0.02-0.5 ng / L）中高三倍。对照中甲基汞的平均百分比为9.0％，低硫酸盐和高硫酸盐处理分别为18.5和16.6％。在中层地表水中测得的甲基汞浓度未反映出在孔隙水中观察到的对照和硫酸盐处理之间的差异。在低硫酸盐处理的前6 cm处，平均沉积物甲基汞的平均浓度（2.33 ng / g）显着高于其他处理方式，范围为0.96至1.57 ng / g。沉积物中的总汞量为20.8至33.4 ng / g，两次处理之间无差异。结果表明，未经硫酸盐修饰的对照在去除金属上同样有效，同时保持较低的汞甲基化水平。

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