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采用乙腈提取、固相萃取净化和高效液相色谱法,分析测定了啶虫脒在露地和大棚2种种植条件下黄瓜和土壤中的残留及消解动态。结果表明:9%啶虫脒可湿性粉剂同时在露地和大棚中按有效成分30.375 g/hm2剂量(推荐高剂量的1.5倍)施药1次,啶虫脒在露地和大棚黄瓜及其土壤中的原始沉积量分别为0.20、0.13 mg/kg和0.29、0.14 mg/kg,露地黄瓜和土壤中的原始沉积量均分别低于大棚;相应地,啶虫脒在黄瓜和土壤中的半衰期分别为9.7、9.4 d(露地)和10.1、11.9 d(大棚)。9%啶虫脒可湿性粉剂同时在露地和大棚中按有效成分20.25 g/hm2和30.375 g/hm2的剂量施药1次和2次,在相同施药剂量、施药次数和采收间隔期情况下,除个别情况外,露地黄瓜中啶虫脒的最终残留量均低于大棚,分别为0.01~0.05 mg/kg(露地)和0.01~0.09 mg/kg(大棚)。
Acetonitrile extraction, SPE purification and HPLC were used to determine the residues and digestion dynamics of acetamiprid in cucumber and soil under the two kinds of planting conditions. The results showed that: 9% acetamiprid WP at the same time in the open and greenhouses by the active ingredient 30.375 g / hm2 dose (1.5 times the recommended high dose) applied once, acetamiprid in the open and greenhouse cucumber and its soil The initial sediment contents of cucumber and soil were 0.20,0.13 mg / kg and 0.29,0.14 mg / kg, respectively. The initial sediment contents of cucumber and soil were lower than that of greenhouse. Correspondingly, the half-lives of acetamiprid in cucumber and soil were 9.7, 9.4 d (open field) and 10.1, 11.9 d (greenhouse). 9% acetamiprid WP at the same time in the open field and greenhouse active ingredients 20.25 g / hm2 and 30.375 g / hm2 dose 1 and 2 times the application dose, the number of applications and harvest interval In all cases, the final residues of acetamiprid in open-field cucumbers were lower than in greenhouses, except for a few cases, in the range of 0.01-0.05 mg / kg (open field) and 0.01-0.09 mg / kg (greenhouse), respectively.