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Simulate methylation reaction of arsenic(III) with methyl iodide in an aquatic system
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.ORCID iD: 0000-0002-5729-1908
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
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2006 (English)In: Applied organometallic chemistry, ISSN 0268-2605, E-ISSN 1099-0739, Vol. 20, no 11, p. 747-753Article in journal (Refereed) Published
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Abstract [en]

The methylation reaction of inorganic arsenic occurring in aquatic systems was studied by HPLC-HGAFS as a method to separate and detect soluble methylarsenic species. Transformation from inorganic arsenic to methylarsenic was essential for major changes in toxicity to organisms. Monomethylarsenic [AsOCH(3)(OH)(2)] was the only product in the methylation reaction of inorganic arsenic(III) with methyl iodide (MeI). This process can be described as an oxidative carbonium-ion transfer, with MeI acting as a methyl donor. From a thermodynamic point of view, the activity of the carbonium ion and pH were the two major influencing factors. The pH dependence of redox potential of As(III) was the reason for the effect of pH on methylation of arsenic. The influences of salinity and concentration of the methyl donor may be explained by their effects on the activity of carbonium. Moreover, kinetics experiments demonstrated that the methylation reaction was first-order for both As(III) and methyl iodide. First-order reaction rates were also calculated at different pH, salinity and MeI, and were found to be in the range 0.0026-0.0123 h(-1). The methylation rate varied largely under different reaction conditions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2006. Vol. 20, no 11, p. 747-753
Keywords [en]
methylation; methyl iodide; inorganic arsenic; reaction kinetics; methylarsenic; aquatic environment
National Category
Environmental Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-47586DOI: 10.1002/aoc.1140ISI: 000241999700004Scopus ID: 2-s2.0-33750514585OAI: oai:DiVA.org:oru-47586DiVA, id: diva2:895350
Note

Funding Agencies:

National Natural Science Foundation of China 20477053

National Basic Research Program of China 2003CB415001 2005CB422206

Available from: 2016-01-18 Created: 2016-01-18 Last updated: 2017-11-30Bibliographically approved

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Wang, Thanh

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