Anaerobic Biotransformation of Organoarsenical Pesticides Monomethylarsonic Acid and Dimethylarsinic Acid

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 h...

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Published inJournal of agricultural and food chemistry Vol. 54; no. 11; pp. 3959 - 3966
Main Authors Sierra-Alvarez, Reyes, Yenal, Umur, Field, Jim A, Kopplin, Mike, Gandolfi, A. Jay, Garbarino, John R
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 31.05.2006
Subjects
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
Reduction
Transformation
methanogenic
Acids
Arsenic
Anaerobe
Biotransformation
Pesticides
redox transformations
Sulfates
sulfate reduction
monomethylarsonous acid
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Summary: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
Bibliography:http://pubs.acs.org/journals/jafcau/index.html
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content type line 23
ISSN:0021-8561
1520-5118
DOI:10.1021/jf053223n