Effects of fulvic substances on the distribution and migration of Hg in landfill leachate.
Effects of fulvic substances on the distribution and migration of Hg in landfill leachate.
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DOI：
10.1039/c1em10103j
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
Chai Xiaoli;Li Guixiang;Wu Jun;Tong Huan-huan;Jie Rong;Z. Youcai
中科院分区：
文献类型：
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作者：
Chai Xiaoli;Li Guixiang;Wu Jun;Tong Huan-huan;Jie Rong;Z. Youcai
对不同填埋场稳定化过程中汞的分布和迁移进行了研究。由于填埋场垃圾的异质性和多变性，汞浓度的变化范围很大。此外，影响汞在垃圾填埋场中迁移的时变条件，包括pH、有机质和植被覆盖，也可能影响垃圾中汞的时间分布。汞的主要组分元素汞随时间的延长而减少，而稳定组分则随时间的延长而增加。从垃圾渗滤液中提取的黄腐酸(FA)对汞的总络合稳定常数较低，这表明有机S基团可能被少量汞迅速饱和，而留下羧基或酚基等含氧官能团作为汞的主要结合部位。
Mercury (Hg) distribution and migration in different landfill stabilization processes were evaluated in this study. Wide ranges of Hg concentrations were observed because of the heterogeneity and variability of landfill refuse. In addition, temporally variable conditions, including pH, organic matter, and vegetation cover, which influence Hg migration in landfills, may also affect the temporal distribution of Hg in landfill refuse. The main fraction of Hg, elemental Hg, decreased with time, while the stable fractions of Hg increased. The fulvic acid (FA) extracted from the landfill leachate had much lower overall Hg-complexation stability constants, which suggests that organic S groups might have been rapidly saturated by small amounts of Hg while leaving oxygen functional groups, such as carboxylic functional or phenolic groups, acting as the primary binding sites for Hg.