Methylmercury speciation in the environment
Although mono-methylmercury (MeHg) is generally accepted to be the most toxic form of mercury (Hg), it is present in the environment in more than one chemical form. MeHg includes many MeHg complexes with various inorganic (e. g., OH, Cl, HS) and organic ligands (e. g., thiols). A soft Lewis acid, MeHg tends to form strong complexes with reduced sulfide species (e. g., sulfide, polysulfides, and thiols). Increasing evidence has shown that differet MeHg complexes can have markedly different chemical reactivities, bioavailahilities, and toxicities, yet most studies so far focussed only on the total concen tration of MeHg, due to the lack of analytical methods for MeHg speciation. Here we present two approaches for speciating MeHg in the environment. The first involves thermodynamic modelling, and the second is a direct analytical technique by high performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). Applications and limitations of each method are discussed.
mercury methylmercury speciafion hioavailability thiols HPLC-ICP-MS
M. Lemes F. Wang
Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada Department of Environm
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
782-783
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）