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为了解40%甲维.毒死蜱水乳剂在甘蓝植株和土壤上使用后的安全性状况,采用高效液相色谱-荧光检测器(HPLC-FLD)和气相色谱-电子捕获检测器(GC-ECD)分别对甘蓝植株和土壤样品中的甲维盐及毒死蜱的含量进行测定,并通过田间试验对药中甲维盐和毒死蜱在甘蓝和土壤中的消解动态进行研究。结果表明:甲维盐和毒死蜱在甘蓝和土壤中均消解较快,甲维盐在甘蓝植株和土壤中的半衰期分别为17.68和40.52 h;毒死蜱在甘蓝植株和土壤中的半衰期分别为1.54~4.68 d和4.13~15.40d。这说明40%甲维.毒死蜱水乳剂属较易降解农药,对甘蓝植株及土壤均安全无害。
In order to understand the safety of 40% carbaryl chlorpyrifos emulsion on cabbage plants and soil, HPLC-FLD and GC-ECD were used to determine the safety of chlorpyrifos emulsion. The contents of carbaryl and chlorpyrifos in cabbage plants and soil samples were determined respectively. The digestion dynamics of carbaryl and chlorpyrifos in cabbage and soil were studied by field experiments. The results showed that carbaryl and chlorpyrifos both digested rapidly in cabbage and soil, the half-lives of carbaryl in cabbage and soil were 17.68 and 40.52 h, respectively, and the half-lives of chlorpyrifos in cabbage and soil were 1.54-4.68 d and 4.13 ~ 15.40d. This shows that 40% of the methyl chlorpyrifos emulsion is a biodegradable pesticide that is safe and harmless to cabbage plants and soil.