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[目的]研究毒死蜱在桑叶和土壤中的消解动态,评价毒死蜱在桑树上使用的安全性,并根据消解曲线方程推测施药后的养蚕安全间隔期。[方法]分别以1500 mg a.i./L和1 m L/m~2毒死蜱药液喷施桑树和土壤后,采用气相色谱法分析桑叶和土壤样品中的残留量变化情况,并建立其消解曲线方程。[结果]毒死蜱在桑叶和土壤中的半衰期分别为1.9~4.0、8.4~9.4 d,浙江和广东两地毒死蜱施药后桑叶中残留量<0.2 mg/kg时的家蚕安全饲养间隔期分别为35、18 d。[结论]毒死蜱在桑叶和土壤中易被降解,其降解速率受环境条件的影响。因此,需根据施药地不同的环境条件来确定其家蚕饲养安全间隔期。
[Objective] The study aimed to study the digestion dynamics of chlorpyrifos in mulberry leaves and soil, evaluate the safety of chlorpyrifos in mulberry trees, and estimate the safety interval of sericulture after spraying according to the digestion curve equation. [Method] After mulberry and soil were sprayed with chlorpyrifos at a dose of 1500 mg ai / L and 1 m L / m ~ 2 respectively, the changes of residues in mulberry leaves and soil samples were analyzed by gas chromatography and its digestion curve was established equation. [Result] The half-lives of chlorpyrifos in mulberry leaves and soil were 1.9 ~ 4.0 and 8.4 ~ 9.4 d, respectively. When the residues of chlorpyrifos in mulberry leaves were less than 0.2 mg / kg in Zhejiang and Guangdong provinces, the safe feeding interval were respectively For 35,18 d. [Conclusion] Chlorpyrifos was easily degraded in mulberry leaves and soil, and its degradation rate was affected by environmental conditions. Therefore, according to the different application of environmental conditions to determine the safety of silkworm feeding interval.