摘要
为评价叶菌唑在小麦中的残留行为及其产生的膳食摄入风险，于北京、安徽及黑龙江进行了1年3地田间试验，建立了叶菌唑在小麦中的残留分析方法，并对我国不同人群的膳食暴露风险进行了评价。样品用乙腈提取，经Florisil固相萃取柱净化，气相色谱一氮磷检测器（GC—NPD）检测，外标法定量。结果表明：在0．02～10mg／蚝的添加水平下，叶菌唑在小麦籽粒和植株中的平均回收率在81％～101％之间，相对标准偏差（RSD）在2．1％-9．1％之间；其在小麦籽粒和植株中的定量限（LOQ）分别为0．02和O．04mg／kg。叶菌唑在小麦植株中的消解符合一级动力学方程，半衰期为4．9—7．3d。收获时小麦籽粒中叶菌唑的最大残留量为0．037mg／kg，低于美国和欧盟设定的最大残留限量（MRL）0．15nag／kg。针对我国不同人群的膳食摄入及风险评估暴露，风险商值（RQ）在0．001—0．002之间，表明叶菌唑在小麦中的膳食摄入风险较低。
In order to evaluate the residue behavior and dietary intake risk of metconazole applied to wheat, the residual trial of metconazole in wheat were carded out in Beijing, Anhui and Heilongiiang provinces. A new method was developed to determine the residue of metconazole in wheat. The risk assessment to different populations based on data of terminal residues in wheat was investigated. The samples were extracted with acetonitrile, purified by florisil SPE column, and determined by gas chromatography coupled with nitrogen phosphorus detector （NPD）. At fortified levels of 0.02 - 10 mg/kg, recoveries of metconazole in wheat and straw were between 81% - 101%, with RSD of 2. 14% -9. 10%. The limits of quantification （LOQs） were 0.02 mg/kg in grain, 0.04 mg/kg in straw. The results indicated that the dissipation of metconazole in straw fitted to the first order kinetics with half-lives of 4. 9 - 7.3 days. At harvest period, the highest residue of metconazole in grain was 0.037 mg/kg, which was lower than the maximum residue limit （MRL, 0. 15 mg/kg） set by the United States and European Union. The risk quotients （RQs） were between 0. 001 -0. 002 for different populations in China, which indicated its low risk in wheat.
出处
《农药学学报》
CAS
CSCD
北大核心
2015年第3期307-312,共6页
Chinese Journal of Pesticide Science
关键词
叶菌唑
小麦
消解动态
残留
风险评价
metconazole
wheat
dissipation
residue
risk assessment
