期刊
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
卷 102, 期 5, 页码 657-664出版社
SPRINGER
DOI: 10.1007/s00128-018-2531-1
关键词
Mercury isotope; Mass dependent fractionation; Mass independent fractionation; Coal combustion; Atmospheric mercury
资金
- National Key Research and Development Plan [2016YFC0201600, 2017YFC0212700]
- National Natural Science Foundation of China [41773104, 41602167, U1612442]
Mercury (Hg) stable isotope is a useful tool to understand the transformation of atmospheric Hg. The observation on the enrichment of heavier isotopes in gaseous elemental Hg (GEM) relative to oxidized Hg-II species in atmosphere cannot be convincingly explained by isotope fractionation of Hg redox processes. This review shows that the large Hg isotope mass dependent fractionation (MDF) in coal-fired boilers is one of the underlying reasons. The reported Hg isotope data of feed coals and their combustion products are first summarized to give a general overview of how Hg isotopes fractionate before Hg discharge from coal-fired boilers. Then, predictive MDF models are discussed to simulate Hg-202 values of different Hg species in coal combustion flue gases. The discharged GEM is predicted to have the highest Hg-202 followed by gaseous Hg-II and particulate-bound Hg-II, which is in consistent with the observed MDF pattern of atmospheric Hg species.
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