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1 September 2003 The Fate of Chloroacetanilide Herbicides and Their Degradation Products in the Nzoia Basin, Kenya
Odipo Osano, Daniel Nzyuko, Mwakio Tole, Wim Admiraal
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Abstract

Alachlor, metolachlor and their respective environmentally stable aniline degradation products, 2,6-diethylaniline and 2-ethyl-6-methylaniline were analyzed in water and sediment samples from 9 sites along River Nzoia, Kenya using gas chromatography. The degradation products were detected in > 90% of the sediment and water samples, while the parent compounds occurred in < 14% of the water samples. Much higher concentrations of the pesticides and their degradation products occurred in the sediment than in the water (1.4 up to 10 800-fold), indicating an accumulation of the compounds in the sediment. The constant occurrence of the degradation products in the sediment during the study period infers a persistence of these compounds. It is hypothesized that the prevailing tropical climatic conditions favor a quick breakdown of the pesticides to their environmentally stable degradation products, thereby making the latter more important pollutants than their parent products in the study area.

Odipo Osano, Daniel Nzyuko, Mwakio Tole, and Wim Admiraal "The Fate of Chloroacetanilide Herbicides and Their Degradation Products in the Nzoia Basin, Kenya," AMBIO: A Journal of the Human Environment 32(6), 424-427, (1 September 2003). https://doi.org/10.1579/0044-7447(2003)032[0424:TFOCHA]2.0.CO;2
Accepted: 1 September 2002; Published: 1 September 2003
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