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Applied and Environmental Microbiology, September 2004, p. 5688-5691, Vol. 70, No. 9
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.9.5688-5691.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Methanogenic Inhibition by Arsenic Compounds

Reyes Sierra-Alvarez,* Irail Cortinas, Umur Yenal, and Jim A. Field

Department of Chemical and Environmental Engineering, University of Arizona, Tucson, Arizona

Received 12 February 2004/ Accepted 22 May 2004

ABSTRACT

The acute acetoclastic methanogenic inhibition of several inorganic and organic arsenicals was assayed. Trivalent species, i.e., methylarsonous acid and arsenite, were highly inhibitory, with 50% inhibitory concentrations of 9.1 and 15.0 µM, respectively, whereas pentavalent species were generally nontoxic. The nitrophenylarsonate derivate, roxarsone, displayed moderate toxicity.

* Corresponding author. Mailing address: Department of Chemical and Environmental Engineering, University of Arizona, P.O. Box 210011, Tucson, AZ 85721-0011. Phone: (520) 626-2896. Fax: (520) 621-6048. E-mail: Rsierra{at}email.arizona.edu.

Applied and Environmental Microbiology, September 2004, p. 5688-5691, Vol. 70, No. 9
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.9.5688-5691.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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