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Anaerobic Biotransformation of Organoarsenical Pesticides Monomethylarsonic Acid and Dimethylarsinic Acid

Sierra-Alvarez, Reyes ; Yenal, Umur ; Field, Jim A ; Kopplin, Mike ; Gandolfi, A. Jay ; Garbarino, John R

Journal of agricultural and food chemistry, 2006-05, Vol.54 (11), p.3959-3966 [Periódico revisado por pares]

Washington, DC: American Chemical Society

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Anaerobic Biotransformation of Organoarsenical Pesticides Monomethylarsonic Acid and Dimethylarsinic Acid
Autor: Sierra-Alvarez, Reyes ; Yenal, Umur ; Field, Jim A ; Kopplin, Mike ; Gandolfi, A. Jay ; Garbarino, John R
Assuntos: anaerobes ; anaerobic conditions ; arsenical herbicides ; Bioconversions. Hemisynthesis ; biodegradation ; Biological and medical sciences ; Biotechnology ; biotransformation ; cacodylic acid ; denitrifying bacteria ; Fundamental and applied biological sciences. Psychology ; herbicide residues ; isolation ; methanogens ; Methods. Procedures. Technologies ; monomethylarsonic acid ; sewage sludge ; sulfate-reducing bacteria ; upflow anaerobic sludge blanket reactor
É parte de: Journal of agricultural and food chemistry, 2006-05, Vol.54 (11), p.3959-3966
Notas: http://pubs.acs.org/journals/jafcau/index.html
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Descrição: Monomethylarsonic acid (MMAV) and dimethylarsinic acid (DMAV) are extensively utilized as pesticides, introducing large quantities of arsenic into the environment. Once released into the environment, these organoarsenicals are subject to microbial reactions. Aerobic biodegradation of MMAV and DMAV has been evaluated, but little is known about their fate in anaerobic environments. The objective of this study was to evaluate the biotransformation of MMAV and DMAV in anaerobic sludge. Biologically mediated conversion occurred under methanogenic or sulfate-reducing conditions but not in the presence of nitrate. Monomethylarsonous acid (MMAIII) was consistently observed as an important metabolite of MMAV degradation, and it was recovered in molar yields ranging from 5 to 47%. The main biotransformation product identified from DMAV metabolism was MMAV, which was recovered in molar yields ranging from 8 to 65%. The metabolites indicate that reduction and demethylation are important steps in the anaerobic bioconversion of MMAV and DMAV, respectively. Keywords: Arsenic; methanogenic; sulfate reduction; redox transformations; monomethylarsonous acid
Editor: Washington, DC: American Chemical Society
Idioma: Inglês

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Anaerobic Biotransformation of Organoarsenical Pesticides Monomethylarsonic Acid and Dimethylarsinic Acid

Sierra-Alvarez, Reyes ; Yenal, Umur ; Field, Jim A ; Kopplin, Mike ; Gandolfi, A. Jay ; Garbarino, John R

Washington, DC: American Chemical Society

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