PMID: 15378982Sep 24, 2004Paper

Aging reduces the bioavailability of even a weakly sorbed pesticide (carbaryl) in soil

Environmental Toxicology and Chemistry
Riaz AhmadAngus M Alston

Abstract

We investigated bioavailability and biodegradation of carbaryl (1-naphthyl methylcarbamate) in a soil with a long history of pesticide contamination from a storage facility located at Mamoon Kanjan, Pakistan. Carbaryl is weakly sorbed and generally considered to be easily degradable in soil. Extraction studies revealed that 49% of the total carbaryl in soil (88.0 mg kg(-1)) was not water-extractable and also not bioavailable, as demonstrated by inoculation of the contaminated soil with a carbaryl-degrading, mixed bacterial culture. Inoculation of the contaminated soil with the carbaryl-degrading culture showed that the bacteria were capable of degrading only the available (i.e., water-extractable) fraction of the pesticide. When the soil was pulverized in a ball mill to enhance the release of residue, an additional 19% of the carbaryl became bioavailable. A significant proportion of residue (approximately 33%) remained unavailable. The long (>12 years) contact time between the pesticide and soil (i.e., aging), allowing possible sequestration into soil nanopores and the organic matter matrices, is suggested to have rendered the pesticide unavailable for microbial degradation. High concentration (88.0 mg kg(-1)) in soil facilitat...Continue Reading

Citations

Sep 24, 2013·Journal of Hazardous Materials·T WoignierM Lesueur-Jannoyer
Aug 8, 2015·Environmental Science and Pollution Research International·Thierry WoignierMagalie Lesueur-Jannoyer
Nov 8, 2011·Journal of Contaminant Hydrology·Hefa ChengYuanan Hu
Jul 5, 2011·Environment International·Mallavarapu MegharajRavi Naidu
Nov 29, 2005·Journal of Contaminant Hydrology·Nathan W HawsEdward J Bouwer
Jul 31, 2019·Environmental Science and Pollution Research International·Thierry WoignierMagalie Jannoyer
Jun 28, 2007·Environmental Science & Technology·Xavier Louchart, Marc Voltz
Feb 16, 2006·Journal of Agricultural and Food Chemistry·Jussara B RegitanoMichael J Sadowsky
Sep 27, 2008·Journal of Agricultural and Food Chemistry·H CiglaschM Kaupenjohann

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