Anaerobic biotransformation of organoarsenical pesticides monomethylarsonic acid and dimethylarsinic acid

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

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)3959-3966
Number of pages8
JournalJournal of agricultural and food chemistry
Volume54
Issue number11
DOIs
StatePublished - May 31 2006

Keywords

  • Arsenic
  • Methanogenic
  • Monomethylarsonous acid
  • Redox transformations
  • Sulfate reduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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