马拉硫磷、杀螟松、甲基嘧啶硫磷与溴氰菊酯在储粮中残留消解与分布的研究

Study on Residue Degradation of Malathion, Fenitrothion, Piriniphos Methyl and Deltamethrin in Stored Grain

在实验室30℃温度下,马拉硫磷、杀螟松与甲基嘧啶硫磷在稻谷内半衰期(t 1/2)相应为1,2.3,3.7个月的仓库条件下,在小麦内马拉硫磷t 1/2为5.4个月,溴氰菊酯15.6个月。采用砻糠载体法施药,在粮食内残留消解动态呈二次方程反应。喷雾法则消解动态呈一级动力学反应。药剂在稻谷加工产品大米和米饭内残留消解率显著低于小麦粉和馒头。

At 30℃ laboratory condition the half ]ires (t 1/2)of residual degradation of malathion, fenitrothion and pirimiphos methyl in rice of residual degradation were respectively 1, 2.3 and 3.7 months. In granary condition the malathion t 1/2 in wheat was 5.4 months and the deltamethion t 1/2 in wheat was 15.6 months. When the pesticides were applied with rice-hull carrier the dynamics of residual degradation exprespse as two exponential equation reaction. When the pesticides were sprayed directly on grain, it expressed as first order reaction. The residual amount in polished rice and cooked rice were significantiy lower than in wheat flour and steamed bread.