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时间:2017-11-25
《茶叶中21种有机磷农药的测定》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2016年2月Vol.34No.2February2016ChineseJournalofChromatography194~201研究论文DOI:10.3724/SP.J.1123.2015.07021羟基化多壁碳纳米管分散固相萃取-气相色谱-质谱法测定茶叶中21种有机磷农药*荣杰峰,韦航,李亦军,黄伙水,许美珠(泉州出入境检验检疫局,福建泉州362000)摘要:建立了用羟基化多壁碳纳米管(MWCNTs-OH)、N-丙基乙二胺键合固相吸附剂(PSA)和MgSO4作为吸附剂的改进QuEChERS-气相色谱
2、-质谱快速检测茶叶中21种有机磷农药的方法。茶叶中残留的农药经正己烷-丙酮(2∶1,v/v)混合溶剂提取,以MWCNTs-OH、PSA和MgSO4去除杂质,离心、过滤后经气相色谱-电子轰击源质谱测定,外标法定量。结果表明,目标化合物在0.01~0.50mg/kg范围内的线性关系良好。空白茶叶样品在低、中、高3个添加水平下的平均回收率为81.5%~109.4%,相对标准偏差(n=5)为2.3%~10.6%,定量限为0.001~0.040mg/kg。该方法操作简单、快速、灵敏、成本低,能满足茶叶中常见有机磷农
3、药残留的检测要求。关键词:羟基化多壁碳纳米管;分散固相萃取;气相色谱-质谱;有机磷农药;茶叶中图分类号:O658文献标识码:A文章编号:1000-8713(2016)02-0194-08Determinationof21organophosphoruspesticidesinteabygaschromatography-massspectrometrycoupledwithhydroxylatedmulti-walledcarbonnanotubesbasedondispersivesolid-phase
4、extraction*RONGJiefeng,WEIHang,LIYijun,HUANGHuoshui,XUMeizhu(QuanzhouEntry-ExitInspection&QuarantineBureau,Quanzhou362000,China)Abstract:Arapiddeterminationmethodof21organophosphoruspesticidesinteawasdevel-opedbyQuEChERSmethodusingmodifiedmulti-walledcarb
5、onnanotubes(MWCNTs-OH),primary-secondaryamine(PSA)andMgSO4coupledwithgaschromatography-massspectrome-try.Thepesticideresiduesinteawereextractedwithahexane-acetone(2∶1,v/v)mixture,andcleanedupbydispersivesolid-phaseextractionusingMWCNTs-OHandprimary-second
6、aryamine(PSA)asthesorbents.Aftercentrifugationandfiltration,thetargetcompoundswereanalyzedbygaschromatography-massspectrometryandquantifiedbytheexternalstandardmethod.Undertheoptimizedconditions,goodlinearitieswereobtainedintherangeof0.01-0.50mg/kg.Theave
7、ragerecoverieswereintherangeof81.5%-109.4%atthreespikedlevels,withrelativestandarddeviations(RSDs,n=5)of2.3%-10.6%.Thelimitsofquantificationwere0.001-0.040mg/kg.Thismethodissimple,fast,sensitive,cheap,andcanmeettherequirementsoftherapiddetectionoforganoph
8、osphoruspesticidesintea.Keywords:hydroxylatedmulti-walledcarbonnanotubes;dispersivesolid-phaseextraction(DSPE);gaschromatography-massspectrometry(GC-MS);organophosphoruspesticides;tea*收稿日期:2015-07-21*通讯联系人.Tel:(0595
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