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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-氮磷检测器(GC-NPD)检测,外标法定量。结果表明:在0.02~10 mg/kg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0.04 mg/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4.9~7.3 d。收获时小麦籽粒中叶菌唑的最大残留量为0.037 mg/kg,低于美国和欧盟设定的最大残留限量(MRL)0.15 mg/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 of wheat in wheat and the dietary risk of it, the field experiments of metconazole in wheat were carried out in Beijing, Anhui and Heilongjiang provinces. The dietary exposure risks of different populations in China were evaluated. The samples were extracted with acetonitrile, purified by Florisil solid phase extraction column, detected by gas chromatography-nitrogen and phosphorus detector (GC-NPD) and quantified by external standard method. The results showed that the average recoveries of metconazole in wheat grains and plants ranged from 81% to 101% with relative standard deviations (RSDs) between 2.1% and 9.1% at the level of 0.02-10 mg / kg (LOQ) of 0.02 and 0.04 mg / kg in wheat grain and plant, respectively. The digestion of metconazole in wheat plants followed the first-order kinetic equation with a half-life of 4.9-7.3 days. The maximum residual content of meconazole in wheat grain at harvest was 0.037 mg / kg, below the MRL of 0.15 mg / kg set by the United States and the European Union. For dietary intake and risk assessment exposure of different populations in China, the risk quotient (RQ) ranged from 0.001 to 0.002, indicating that the risk of dietary exposure to metconazole in wheat is low.