壳聚糖对菠菜中毒死蜱和乐果的降解作用（Effects of Spraying Chitosan on Degradation of Chlorpyrifos and Dimethoate Residues in Spinach）

在露地栽培条件下,研究了叶面喷施壳聚糖水溶液对菠菜中毒死蜱和乐果的降解作用.结果表明,叶面喷施不同浓度的壳聚糖(50、100、200、400mg·L-1)可有效降低菠菜中毒死蜱和乐果残留量,其中较低浓度壳聚糖能更有效地降低菠菜中毒死蜱、乐果的残留量.50mg·L-1壳聚糖使菠菜中毒死蜱残留量较对照降低40.2%,安全间隔期缩短2.07d;100mg·L-1壳聚糖使菠菜中乐果残留量较对照降低46.9%,安全间隔期缩短0.5d.壳聚糖作为一种有机磷农药降解剂应用于蔬菜生产是可行的.

Effects of Spraying Chitosan on Degradation of Chlorpyrifos and Dimethoate Residues in Spinach

Effects of spraying chitosan on chlorpyrifos and dimethoate residues in spinach was investigated in the openfield.Results showed that spraying different concentrations of chitosan(50,100,200,400mg·L-1)could reduce chlorpyrifos and dimethoate residues in spinach effectively.And among of the different concentrations of chitosan,low concentrations of chitosan could more effectively reduce chlorpyrifos and dimethoate residues in spinach.By spraying 50mg·L-1 of chitosan,chlorpyrifos residue in spinach was 40.2 percent lower than that of control,the plant pre-harvest interval(PHI)shorten 2.07d than that of control.While with 100mg·L-1 of chitosan,dimethoate residue in spinach was 46.9 percent lower and the PHI shorten 0.5d than that of control.The practice proved that chitosan as a degradation preparation of organophosphorus pesticide is feasible.