Methylated mercury species in municipal waste landfill gas sampled in Florida, USA
Methylated mercury species in municipal waste landfill gas sampled in Florida, USA
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DOI：
10.1016/s1352-2310(01)00176-5
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发表时间：
2001-08-01
影响因子：
5
通讯作者：
Reinhart, D
中科院分区：
文献类型：
--
作者：
Lindberg, SE;Wallschläger, D;Reinhart, D
含汞材料已被置于市政垃圾填埋场，其来源广泛，包括荧光灯、电池、电气开关、温度计和一般废物。尽管已知汞在环境中具有挥发性、持久性和毒性，但尚未对汞在垃圾填埋场中的命运进行广泛研究。旨在通过厌氧细菌产生甲烷来减少废物的垃圾填埋场的性质表明，这些系统也可能作为生产甲基化汞化合物的生物反应器。这些物种的毒性要求需要确定它们是否在城市垃圾填埋气（LFG）中排放。在先前的研究中，我们在佛罗里达的两个垃圾填埋场测量了填埋气中总气态汞（TGM）的含量，范围为mug/m3，并在填埋气冷凝物中发现了高水平的一甲基汞（MMM），这表明填埋气中可能存在气态有机汞化合物。在目前的研究中，我们测量了TGM，汞-0，和甲基化汞化合物直接在LFG从另一个佛罗里达垃圾填埋场。同样，TGM在mug/m3范围内，MMM在冷凝物中发现，这次我们在LGF中确定了mug/m3范围内的二甲基汞（DMM）。这些结果确定垃圾填埋场可能是DMM向空气排放的人为来源，并可能有助于解释大陆降雨中MMM的报告。出版社：Elsevier Science Ltd
Mercury-bearing material has been placed in municipal landfills from a wide array of sources including fluorescent lights, batteries, electrical switches, thermometers, and general waste. Despite its known volatility, persistence, and toxicity in the environment, the fate of mercury in landfills has not been widely studied. The nature of landfills designed to reduce waste through generation of methane by anaerobic bacteria suggests the possibility that these systems might also serve as bioreactors for the production of methylated mercury compounds. The toxicity of such species mandates the need to determine if they are emitted in municipal landfill gas (LFG). In a previous study, we had measured levels of total gaseous mercury (TGM) in LFG in the mug/m(3) range in two Florida landfills, and elevated levels of monomethyl mercury (MMM) were identified in LFG condensate, suggesting the possible existence of gaseous organic Hg compounds in LFG. In the current study, we measured TGM, Hg-0, and methylated mercury compounds directly in LFG from another Florida landfill. Again, TGM was in the mug/m(3) range, MMM was found in condensate, and this time we positively identified dimethyl mercury (DMM) in the LGF in the mug/m(3) range. These results identify landfills as a possible anthropogenic source of DMM emissions to air, and may help explain the reports of MMM in continental rainfall. Published by Elsevier Science Ltd.