摘要
采用气相色谱质谱法测定了烯酰吗啉在春季大葱中的残留消解动态和最终残留量。样品经乙腈提取,SAX/PSA固相萃取柱净化,气相色谱质谱选择离子(GC/MS/SIM)检测。结果表明:方法在0.01～0.1mg/kg水平的平均添加回收率为96.2%～105.7%,相对标准偏差为3.5%～5.7%,烯酰吗啉最小检出量为0.02ng,最低检测质量分数为0.002mg/kg。烯酰吗啉在大葱中消解较快,半衰期为3.5d,药后14d消解95%以上。50%烯酰吗啉可湿性粉剂按推荐剂量(300ga.i./hm2)和加倍剂量(600ga.i./hm2)对水喷雾2～3次,末次施药后7、14、21d烯酰吗啉在大葱中残留量为0.0094～0.681mg/kg,低于日本规定的最大允许残留量(MRL)。
Gas chromatography-mass spectrum （GC-MS） was used in the field residue dynamics study and final residues of dimethomorph in scallion in spring. Scallion samples were extracted with acetonitrile and the extracts were cleaned up by SPE column filled with sax tandem psa, followed by determination using gas chromatographymass spectrum with selected ion monitor （GC/MS/SIM）. The fortified recovery at level of 0.01-0.1 mg/kg ranged from 96.2-105.7%, with relative standard deviation of 3.5-5.7%. The limit of detection of dimethomorph by the method was 0.02 ng, and the limit of quantification for dimethomorph in scallion was 0.002 mg/kg. The field residue dynamics study showed that the half-lives of dimethomorph in scallion was 3.5 d. When the scallion was sprayed two to three times with dimethomorph 50% WP of 300 g a.i./ha and 600 g a.i./ha, at the 7th, 14th and 21th day after the last application, the final residues of dimethomorph in scallion were 0.0094-0.681 mg/kg, which were below the MRL in Japan.
出处
《农药》
CAS
北大核心
2010年第1期47-49,52,共4页
Agrochemicals
基金
山东出入境检验检疫系统科研项目(SK200824)
关键词
烯酰吗啉
大葱
消解
残留
dimethomorph
scallion
degradation
residue
