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通过田间植株直接施药-定期采样-样品提取净化-气相色谱分析的方法,研究了48%毒死蜱乳油中毒死蜱在杭白菊胎菊和土壤中的消解动态,并在室内探讨了不同温度对干胎菊中毒死蜱消解的影响。结果表明:在有效成分0.48和0.72 kg/hm22个施药剂量下,毒死蜱在杭白菊土壤和鲜胎菊中的消解半衰期分别为9.24~10.82 d和2.94~4.22 d;不同温度下,干胎菊中毒死蜱的半衰期在12.64~27.39 d之间,存在显著性差异(P<0.05),其消解速率随温度升高而加快;在杭白菊上分别以有效成分0.48 kg/hm2(推荐高剂量)和0.72 kg/hm2(1.5倍推荐高剂量)的剂量喷雾施药2次,距末次施药后21 d时,毒死蜱在干胎菊中的残留量分别为0.58和0.89 mg/kg,均低于我国制定的毒死蜱在茶叶中的最大残留限量(MRL)标准(1 mg/kg)。
The direct digestion of chlorpyrifos 48% chlorpyrifos in the chrysanthemum and soil of Chrysanthemum morifolium was studied by the direct application of plants in the field - regular sampling - sample extraction and purification - gas chromatography analysis, and the effects of different temperatures on dry embryos Effect of chlorpyrifos on digestion. The results showed that the half-lives of chlorpyrifos in the soil of Chrysanthemum morifolium and Totana chrysantha were 9.24-10.82 d and 2.94-4.22 d at the effective dose of 0.48 and 0.72 kg / hm2, respectively. At different temperatures, The half-life of chlorpyrifos in the range of 12.64 ~ 27.39 d, there was a significant difference (P <0.05), the rate of digestion accelerated with increasing temperature; the Chrysanthemum respectively with the active ingredient 0.48 kg / hm2 (recommended high dose) and 0.72 kg / hm2 (1.5 times the recommended high dose) spraying dose twice, 21 d after the last application, the residual amount of chlorpyrifos in the dry cartilage were 0.58 and 0.89 mg / kg, lower than our country Chlorpyrifos established in the tea leaf maximum residue limit (MRL) standard (1 mg / kg).