Occurrence of monoethylmercury in the Florida Everglades: Identification and verification |
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Authors: | Yuxiang Mao Yongguang Yin Guangliang Liu Guibin Jiang |
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Institution: | a Department of Chemistry & Biochemistry and Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA b Henan Polytechnic University, Jiaozuo, 454000 China c State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China d State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Science, 46 Guanshui Road, Guiyang 550002, China |
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Abstract: | A few studies have reported the occurrence of monoethylmercury (CH3CH2Hg+) in the natural environment, but further verification is needed due to the lack of direct evidence and/or uncertainty in analytical procedures. Various analytical techniques were employed to verify the occurrence of CH3CH2Hg+ in soil of the Florida Everglades. The identity of CH3CH2Hg+ in Everglades soil was clarified, for the first time, by GC/MS. The employment of the recently developed aqueous phenylation-purge-and-trap-GC coupled with ICPMS confirmed that the detected CH3CH2Hg+ was not a misidentification of CH3SHg+. Stable isotope-tracer experiments further indicated that the detected CH3CH2Hg+ indeed originated from Everglades soil and was not an analytical artifact. All these evidence clearly confirmed the occurrence of CH3CH2Hg+ in Everglades soil, presumably as a consequence of ethylation occurring in this wetland. The prevalence of CH3CH2Hg+ in Everglades soil suggests that ethylation could play an important role in the biogeochemical cycling of Hg. |
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Keywords: | Monoethylmercury Occurrence Soil Everglades Isotope tracer |
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