4种农药在稻田水中的残留降解

对乐果、杀虫单、丁草胺和氰戊菊酯４种 经，在稻田水中的残留降解情况，进行了及比较。结果表明，４种农药在稻田水中的残留降解符合Ｃ－Ｃｏ．３＾ｋｔ或Ｃ＝Ａ．ｅ＾－１６＋Ｂ．３＾βｉ的数学式，据此可计算其平均降解半衰期（ｔ０．５）分别为：１．８６、１．３５、０．８８和０．３８ｄ，其中丁草胺和氰戊菊酯的降解前快后慢，氰戊菊酯的降解愉丁乐果，土壤吸附氰戊菊酯是其降解快的重要原因，脂溶性农药对水环境的污染要轻

Residue Degradation of Four Kinds of Pesticide in Rice Field Water

Residue degradation of dimethorate, molosultap, butachlor and fenvalerate in rice field water have been studied and compared. The result showed that residue degradation of four kinds of pesticide in rice field water coincided with C=C0.e-kt mathematical model, their average half-life (t0.5)of residue degradation in rice field water were 1.86, 1.35, 0.88 and 0.38 days respectively, residue degradation of butachlor and fenvalerate was fast in early stage and slow in late stage; degradation of fenvalerate was faster than of dimethoate, soil absorbing fenvalerate from water was an important reason of its fast degradation. Based on the test result, considering that water environmental pollution by lipo soluble pesticides was lighter than water-soluble pesticides.