Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/61213
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Type: Journal article
Title: Faster degradation of herbicidally-active enantiomer of imidazolinones in soils
Author: Ramezani, M.
Oliver, D.
Kookana, R.
Lao, W.
Gill, G.
Preston, C.
Citation: Chemosphere, 2010; 79(11):1040-1045
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2010
ISSN: 0045-6535
1879-1298
Statement of
Responsibility: 
Mohammad Kazem Ramezani, Danielle P. Oliver, Rai S. Kookana, Wenjian Lao, Gurjeet Gill and Christopher Preston
Abstract: Imidazolinones are chiral herbicides, comprised of two enantiomers with differential herbicidal activity. In this study, the selective degradation of enantiomers of the three imidazolinone herbicides, imazapyr, imazethapyr and imazaquin, was determined in a variety of soils selected to cover a broad range of physico-chemical characteristics. The R(+) enantiomer of all three herbicides, which has greater herbicidal activity (up to eight times), was found to degrade faster than the less active S(-) enantiomer. The enantiomer fraction (EF) was used as a descriptor of enantio-selectivity of the imidazolinone herbicides. The EF values increased with increasing incubation time for imidazolinones with a fast initial phase followed by a slower phase. While the enantio-selectivity was not significant in acidic soils (pH(w) 5.02 and 5.20), it was highly significant (P<0.001) in alkaline soils (pH(w) 7.6, 8.2 and 8.7). Significant positive correlations of EF values of imazapyr (P<0.001, R(2)=0.41), imazethapyr (P<0.002, R(2)=0.47) and imazaquin (P<0.001, R(2)=0.54) were found with the soil pH(w) ranging from 5.02 to 8.7. However, no correlation of EF was found with other soil properties. In addition to showing enantioselective degradation of the three herbicides in the soils studied, the study highlighted that for imidazolinones the herbicidally more active enantiomer can be preferably degraded by microorganisms.
Keywords: Enantio-selectivity; Imazapyr; Imazethapyr; Imazaquin
Rights: Crown copyright © 2010 Published by Elsevier Ltd.
RMID: 0020096851
DOI: 10.1016/j.chemosphere.2010.03.046
Description (link): http://www.elsevier.com/wps/find/journaldescription.cws_home/362/description#description
Appears in Collections:Agriculture, Food and Wine publications

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