气相色谱法测定荔枝中7种拟除虫菊酯类农药残留量

发布时间：2018-03-13 21:21

本文选题：气相色谱法　切入点：拟除虫菊酯类农药　出处：《理化检验(化学分册)》2017年02期 　论文类型：期刊论文

【摘要】：采用气相色谱法测定荔枝中联苯菊酯、甲氰菊酯、氯氟氰菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯和溴氰菊酯等7种拟除虫菊酯类农药的残留量。荔枝样品用丙酮-正己烷(1+1)混合液提取,所得提取液用活性炭柱和中性氧化铝柱的串联柱净化,用DB-35毛细管色谱柱分离,电子捕获检测器检测。7种拟除虫菊酯类农药的质量浓度均在0.05~0.8mg·L~(-1)内与其峰面积呈线性关系,方法的检出限(3S/N)在0.005~0.01mg·kg~(-1)之间。在0.05,0.1,0.2mg·kg~(-1)等3个浓度水平进行加标回收试验和精密度试验,回收率在81.0%~104%之间,测定值的相对标准偏差(n=6)在1.7%~5.1%之间。采用此法测定了荔枝样品中联苯菊酯的含量,所得测定值与行业标准方法测定结果相符。
[Abstract]:Bifenthrin, methpermethrin, cypermethrin, cypermethrin, cypermethrin and cypermethrin in litchi were determined by gas chromatography. The residues of seven pyrethroid pesticides, such as fenvalerate and deltamethrin, were extracted from litchi samples with acetone-hexane 11) mixture, and purified by series column of activated carbon column and neutral alumina column. The mass concentration of 7 pyrethroid pesticides was determined by DB-35 capillary column. The concentration of pyrethroid pesticides was in the range of 0.05 ~ 0. 8mg 路L ~ (-1) and the peak area was linear. The detection limit of 3s / N was 0.005 ~ 0.01mg 路kg ~ (-1), and the recovery rate was between 81.0% and 10.4% at the concentration of 0.05 ~ 0.1g 路kg ~ (-2) mg 路kg ~ (-1). The relative standard deviation (RSDs) of the determined values was between 1.7and 5.1%. The method was used to determine the content of bifenthrin in litchi samples, and the results were in agreement with the industry standard method.
【作者单位】：海南出入境检验检疫局技术中心;海南大学食品学院;
【基金】：海南省重点科技计划项目(ZDXM20120039;ZDXM20120040) 海南省自然科学基金(212018) 国家质检总局科技计划项目(2013IK153)
【分类号】：TS255.7;O657.71

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