Effect of Temperature and Moisture on Degradation of Herbicide Atrazine in Agricultural Soil

Degradation rate and degraded products, deethylatrazine (DEA), deisopropylatrazine (DIA) and atrazine-2hydroxy (HA), of herbicide atrazine in agricultural soil were determined by ultra-performance liquid chromatography–mass spectrometry. When treating soils for 60d at 25°C, the degradation rate of atrazine increased with the moisture from 5 to 20%. The degradation was fitted one-order kinetic equation and degradation rate constant (k) and Half-life (T1/2) were obtained. T1/2 decreased by 3–4 folds with the increasing temperature from 5 to 35°C and moisture from 5 to 20%. The species and content of the degraded products increased with the temperature and moisture. When treating soil for 60d, the sum content of three degraded products, DEA, DIA and HA is 3–6.8 times greater than atrazine residue. An updated metabolism pathway of atrazine in soil was presented. Keywords— Atrazine, Degradation kinetics, Degradation products, Metabolism pathways, Soil.

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