The impact of soil organic matter and soil sterilisation on the bioaccessibility of (14)C-azoxystrobin determined by desorption kinetics

Clegg, Helen and Riding, Matthew J. and Oliver, Robin and Jones, Kevin C. and Semple, Kirk T. (2014) The impact of soil organic matter and soil sterilisation on the bioaccessibility of (14)C-azoxystrobin determined by desorption kinetics. Journal of Hazardous Materials, 278. pp. 336-342. ISSN 0304-3894

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Abstract

As soils represent a major sink for most pesticides, factors influencing pesticide degradation are essential in identifying their potential environmental risk. Desorption of (14)C-azoxystrobin was investigated over time in two soils under sterile and non-sterile conditions using exhaustive (solvent) and non-exhaustive (aqueous) methods. Desorption data were fitted to a two-compartment model, differentiating between fast and slow desorbing fractions. With increased ageing, rapid desorption (Frap) (bioaccessibility) decreased with corresponding increases in slowly desorbing fractions (Fslow). The rapid desorption rate constant (kfast) was not affected by ageing, sterility or extraction solvent. The non-exhaustive extractions had similar desorption profiles; whereas exhaustive extractions in aged soils had the highest Frap. In non-sterile soil, Frap was lower resulting in higher Fslow, while desorption rates remained unaffected. Organic matter (OM) reduces Frap; but not desorption rates. Microorganisms and OM enhanced ageing effects, reducing the fraction of fast desorbing chemicals and potentially the bioaccessibility of pesticides in soil.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
70306
Deposited By:
Deposited On:
12 Aug 2014 15:06
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Feb 2020 08:23