气相色谱法快速测定菜心中3种有机磷农药残留
2016-10-20杨娟吴星祥黎小鹏陈楠马世柱冯敏铃
杨娟 吴星祥 黎小鹏 陈楠 马世柱 冯敏铃


摘要 建立了菜心中甲拌磷、水胺硫磷和丙溴磷3种有机磷农药的气相色谱快速测定方法。菜心样品经乙腈提取,选用DB-1701P(30 m×0.250 mm×0.25 μm)毛细管柱色谱分离,FPD检测器检测。结果表明:3种有机磷农药在50~1 000 ng/L浓度范围内,均有良好的线性关系,相关系数不低于0.999 9,在14 min内完全分离;3种有机磷农药的加标回收率为81.1%~107.6%,相对标准偏差在(n=7)3.4%~9.8%之间。该方法适于菜心中3种有机磷农残的快速检测。
关键词 气相色谱法;菜心;有机磷农药;残留量
中图分类号 X839.2;O657.71 文献标识码 A 文章编号 1007-5739(2016)05-0140-01
Abstract A gas chromatography method was developed for the rapid determination of 3 organophosphorus pesticides residues,including phorate,isocarbophos and profenofos in flowering Chinese cabbage sample. The samples were extracted with acetoneitrile,then separated in a DB-1701P(30 m×0.250 mm×0.25 μm)capillary column and detected with flame photometric detector(FPD). The results showed that the 3 organophosphorus pesticide′s linearity were good,their correlation coefficients not less than 0.999 9 in range of 50~1 000 ng/L and they could be separated within the 14 min;at the same time that the 3 organophosphorus pesticide′s spiked recoveries ranged from 81.1% to 107.6% with RSD′s(n=7)in the range of 3.4%~9.8%. The proposed method was suitable for fast detecting 3 organophosphorus pesticide in flowering Chinese cabbage.
Key words gas chromatography;flowering Chinese cabbage;organophosphorus pesticide;residue
菜心又名菜薹、廣东菜薹、广东菜、菜花等,以花薹供食用。菜心是广西、广东两省蔬菜的主栽品种,其种植面积在叶类蔬菜品种中居首位[1]。近年来,随着种植面积不断扩大,复种次数不断增多,病害也越来越严重。因此,在菜心种植过程中常需施用有机磷农药进行病虫害防治。有机磷类农药在帮助作物增产的同时,由于过量使用和不当使用引起了农药残留问题[2-3]。因此,建立一种快速、准确测定菜心中有机磷多种农药残留检测方法具有重要意义。
笔者采用气相色谱法对菜心中甲拌磷、水胺硫磷和丙溴磷3种有机磷农药进行快速测定,该方法具有灵敏度高、重现性好、检测结果准确可靠的优点。
1 材料与方法
1.1 仪器与试剂
Agilent 7890A气相色谱,配FPD检测器(美国安捷伦公司),T-18 digital匀浆机(德国IKA公司),IKAM3型旋涡混合器(德国IKA公司),MULTIVAPTM 118氮吹仪(美国Organomation公司)。
丙酮为色谱纯(德国Merck公司);氯化钠为分析纯(广州化学试剂厂),使用前在140 ℃烘烤4 h;……
