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[目的]为评价二嗪磷在水稻上使用后的残留行为及环境安全性,在浙江宁波进行了50%二嗪磷水乳剂在水稻上的田间试验。[方法]建立了液相色谱串联质谱检测稻田水、土壤、水稻植株和糙米中二嗪磷残留方法。[结果]二嗪磷在稻田水、土壤及水稻植株中的平均消解半衰期分别为2.5、8.7、9.9 d。按照750、1125 g a.i./hm~2的剂量,施药2次和3次,末次施药后10、20、30 d,二嗪磷在糙米中最终残留量低于国家残留限量(0.1 mg/kg)。[结论]50%二嗪磷水乳剂剂型环保、使用安全,适合在水稻上应用。
[Objective] The purpose of this study was to evaluate the residual behavior of diazinon in rice and its environmental safety. A field experiment on 50% diazinon emulsion in rice was conducted in Ningbo, Zhejiang Province. [Method] A method for the determination of diazinon residues in paddy field water, soil, rice plants and brown rice by liquid chromatography-tandem mass spectrometry was established. [Result] The average digestion half-lives of diazinon in paddy field, soil and rice plants were 2.5, 8.7 and 9.9 d, respectively. The final residue of diazinon in brown rice was lower than the national residue limit (0.1 mg / L) at the dosage of 750,1125 g ai / hm ~ 2 twice and three times after 10,20 and 30 d after the last application, kg). [Conclusion] The formulation of 50% diazinon water emulsion is environmentally friendly, safe to use and suitable for application on rice.