期刊
MARINE POLLUTION BULLETIN
卷 98, 期 1-2, 页码 40-46出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.07.015
关键词
Methylation; Monomethylmercury; Tert-butyl compounds; Ultraviolet irradiation; Aqueous solution
资金
- National Natural Science Foundation of China [21307167, 40903046, 41202136, 41271505, 20937002]
- National Basic Research Program of China [2013CB430004]
- Doctoral Fund of Ministry of Education of China [20130171120038]
The methylation of mercury (Hg) is of great concern as methylmercury (MeHg), the most toxic species, is produced. This study examined the possibilities of tert-butyl compounds (tert-butyl alcohol (TBA) and tert-butyl hydroperoxide (TBH)) and other alcohols serving as methyl donors for Hg photo-methylation under light irradiation. The yield of MeHg varied among the methyl donors, and it was also significantly influenced by salinity and pH. MeHg could be generated in the presence of TBH under visible light irradiation. The hydroxyl radical ((OH)-O-center dot) was found to promote MeHg production at low levels, but degrade MeHg in excess. The photo-production of MeHg was tentatively proposed via the complexation of Hg and methyl donors, the formation of an intermediate (O-center dot(Hg)C(CH3)(3)), and the intramolecular methyl transfer from methyl donors to Hg. This study implicates photoreactions between Hg and organic pollutants in understanding the fate and transformation of Hg in the aquatic environment. (C) 2015 Elsevier Ltd. All rights reserved.
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