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为了明确啶虫脒在高原夏菜上的残留及其在生产中的合理使用,采用气相色谱-质谱法测定了啶虫脒在高原夏菜甘蓝和青花菜上的残留量;分析比较了啶虫脒在两种蔬菜上的降解动态。结果表明,啶虫脒在两种高原夏菜上的残留降解动态均符合一级反应动力学模型,但在相同施药剂量下啶虫脒在青花菜上的残留沉积量高于甘蓝,并且降解缓慢,其半衰期在青花菜上为3.5~3.9 d,甘蓝上为3.0~3.3 d。啶虫脒在药后9、15 d分别在甘蓝和青花菜上的残留量均可降到规定的最大残留限量以下。因此,建议3%啶虫脒EC按15.75~18.0 g/hm2施用,在甘蓝上的安全间隔期不少于9 d,青花菜上不少于15 d。
In order to clarify the residues of acetamiprid in plateau summer vegetables and their rational use in production, the residues of acetamiprid in plateau cabbage and broccoli were determined by gas chromatography-mass spectrometry. Degradation dynamics of amidine on two vegetables. The results showed that the degradation kinetics of acetamiprid in two plateau summer vegetables was consistent with the first-order reaction kinetics model. However, the residual deposition of acetamiprid in broccoli was higher than that of cabbage under the same application dose, Slow, its half-life in broccoli 3.5 ~ 3.9 d, 3.0 ~ 3.3 d on cabbage. Residues of acetamiprid in cabbage and broccoli at 9 and 15 days after treatment were both lower than the prescribed maximum residue limit. Therefore, it is recommended that 3% Acetamiprid EC be applied at 15.75-18.0 g / hm2 with a safety interval of not less than 9 d on cabbage and no less than 15 d on broccoli.