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Transformation rates of four widely used pesticides were determined in surface waters that were characterised on the basis of hydrological status and physico-chemical, biochemical and chemical composition. Large variations in transformation rates were observed, ranging from 0.004 to 0.01 day -1 (half-life = 70-173 days) for aldicarb, 0.005 to 0.57 day -1 (half-life = 1-139...
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