摘要
为了评价嘧菌酯在洋葱上使用的安全性,对其在洋葱中的残留水平、消解趋势进行研究。样品用乙腈提取,提取液经PSA、GCB吸附剂分散固相萃取净化后,用高效液相色谱-串联质谱检测。结果表明,嘧菌酯在洋葱头中的平均回收率在94%~104%,相对标准偏差为3%。在洋葱植株中的平均回收率在100%~101%,相对标准偏差在0.4%~2%,最小检出量为1.0×10^(-10) g。按照有效成分300 g/hm^(2)和450 g/hm^(2)的用量,喷雾施药2~3次,施药间隔7 d,距末次施药间隔10、14、21 d采样。在山西、河南、江苏、上海、广西、山东的最终残留试验表明,嘧菌酯在洋葱头中的最终残留量值为小于0.010~1.08 mg/kg,其中在江苏、广西的洋葱植株上的降解半衰期分别为3.9、3.8 d。该方法简单可靠,可满足嘧菌酯在洋葱的残留检测要求。洋葱中嘧菌酯残留量低于联合国粮农/世卫组织联合法典委员会(CAC)、欧盟和日本规定的最大残留量。
To evaluate the safety of pyrimidil on onion,the residue level and digestion trend of pyrimidil in onion were studied.The samples were extracted with acetonitrile,purified by PSA and GCB adsorbent dispersion solid-phase extraction,and then detected by high performance liquid chromatography-tandem mass spectrometry.The average recovery rate of cyproil in onion was 94%-104%.The relative standard deviation was 3%.The average recovery rate in onion plants was between 100% and 101%.The relative standard deviation was between 0.4% and 2%.The minimum detection amount was 1.0×10^(-10) g.According to the dosage of active ingredients 300 g/hm^(2) and 450 g/hm^(2),spray application was conducted for 2-3 times with 7 d interval and sampling at 10,14 and 21d interval between the last application.The final residue test in Shanxi,Henan,Jiangsu,Shanghai,Guangxi and Shandong showed that the final residue of cytosyl in onion was less than 0.010-1.08 mg/kg.The degradation half-lives of onion plants in Jiangsu and Guangxi were 3.9 and 3.8 d,respectively.The method is simple and reliable,and can meet the requirement of pyrimidil residue in onion.The residual amount of pyrimethanil in onion is lower than the maximum residue amount stipulated by CAC,EU and Japan.
作者
李春勇
金静
王霞
秦曙
LI Chunyong;JIN Jing;WANG Xia;QIN Shu(Shanxi Center for Testing of Functional Agro-Products,Laboratory of Quality and Safety Risk Assessment for Agro-Products(Taiyuan),Ministry of Agriculture and Rural Affairs,Taiyuan 030031,China)
出处
《现代农药》
CAS
2021年第1期38-41,共4页
MODERN AGROCHEMICALS
基金
农业农村部农业行业标准制定和修订项目(农财发[2018]46号)
山西省重点研发计划重点项目(201903D211011)。
关键词
嘧菌酯
洋葱
残留
消解动态
azoxystrobin
onion
residue
dissipation dynamics
