Gaseous methyl- and inorganic mercury in landfill gas from landfills in Florida, Minnesota, Delaware, and California☆
Gaseous methyl- and inorganic mercury in landfill gas from landfills in Florida, Minnesota, Delaware, and California☆
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DOI：
10.1016/j.atmosenv.2004.09.060
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发表时间：
2005
影响因子：
5
通讯作者：
S. Lindberg;G. Southworth;E. Prestbo;D. Wallschläger;M. Bogle;J. Price
中科院分区：
文献类型：
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作者：
S. Lindberg;G. Southworth;E. Prestbo;D. Wallschläger;M. Bogle;J. Price
城市垃圾填埋场含有多种汞源，可排放到大气中。厌氧细菌产生甲烷表明，垃圾填埋场可能充当甲基化汞化合物的生物反应器。自从我们之前在佛罗里达的一个垃圾填埋场进行研究以来，在美国几个地区的另外九个城市垃圾填埋场的垃圾填埋气体中，已经确定并量化了气态无机汞和甲基化汞。总气态汞的浓度在μgm− 3范围内，而甲基化化合物的浓度在ngm− 3范围内，除了一个填埋场之外。二甲基汞是主要的甲基化物质，浓度高达100 ngm −3，而一甲基汞一般较低。在废物暴露处理场地（如工作面、转运区）附近进行的有限测量表明，在这些活动中也会释放出甲基汞。尽管美国产生的垃圾填埋气中有越来越多的被燃烧（这会将有机汞热分解为无机汞），但未燃烧的垃圾填埋气是甲基化汞排放到大气中的一个潜在的重要人为来源。
Municipal waste landfills contain numerous sources of mercury which could be emitted to the atmosphere. Their generation of methane by anaerobic bacteria suggests that landfills may act as bioreactors for methylated mercury compounds. Since our previous study at a single Florida landfill, gaseous inorganic and methylated mercury species have now been identified and quantified in landfill gas at nine additional municipal landfills in several regions of the US. Total gaseous mercury occurs at concentrations in the μgm−3range, while methylated compounds occur at concentrations in the ngm−3range at all but one of the landfill sites. Dimethylmercury is the predominant methylated species, at concentrations up to 100ngm−3, while monomethyl mercury was generally lower. Limited measurements near sites where waste is exposed for processing (e.g. working face, transfer areas) suggest that dimethylmercury is released during these activities as well. Although increasing amounts of landfill gas generated in the US are flared (which should thermally decompose the organic mercury to inorganic mercury), unflared landfill gas is a potentially important anthropogenic source of methylated mercury emissions to the atmosphere.