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Getenga, Z.M.* ; Dörfler, U. ; Schroll, R.

Study of atrazine degradation in soil from Kenyan sugarcane-cultivated fields in controlled laboratory conditions.

Toxicol. Environ. Chem. 91, 195-207 (2009)

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Open Access Green as soon as Postprint is submitted to ZB.

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A study to compare the extent of atrazine mineralization in soils from Kenyan sugarcane-cultivated fields with and without history of atrazine use was carried out in the laboratory under controlled conditions. The study was testing the hypothesis that repeated atrazine application to soil will not result in enhanced atrazine mineralization. The study was carried out with 14C-uniformly ring-labeled atrazine in a laboratory under controlled conditions. Atrazine mineralization to 14CO2 in soil with no history of atrazine use was negligible (0.16%) after 163 days of soil incubation. The three metabolites hydroxyatrazine, desisopropylatrazine, and desethylatrazine in the proportion of 17.7%, 1.3%, and 2.6%, respectively, were in the soil after 75 days. In the soil from the sugarcane-cultivated field with history of atrazine use, atrazine mineralization was 89.9% after 98 days. The same soil, amended with mature compost, showed a lag phase of eight days before rapid atrazine mineralization was observed.

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