毒死蜱在土壤中的光催化降解

Studies on the Photodegradation of Chlorpyrifos in Soil

以 5 0 0 W氙灯为光源 ,研究了毒死蜱在 2种不同土壤中的光化学降解以及土壤湿度、 Ti O2 、 Fe3+对其光解的影响。结果表明 ,毒死蜱在土壤中光解较快 ,其半衰期为 1 9.5 6～ 2 5 .89h;Ti O2 、Fe3+对其光解有显著的促进作用 ,光解半衰期分别缩短了 1 4.98%和 2 6.2 9% ;土壤水分对于毒死蜱光解的影响与土壤质地有关。

The photodegradation of chlorpyrifos in two kinds of soils were studied under the irradiation of Xenon Lamp. The results showed that TiO 2,Fe 3+ accelerated the photolytic rates of chlorpyrifos in humid soil. Half lives of chlorpyrifos in humid soil,TiO 2,Fe 3+ were 23 70 h,20 15 h and 17 47 h,respectively. Soil properties were observed playing an important role in decreasing the photolytic rates of chlorpyrifos.