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用于气相色谱和气相色谱_质谱测定_省略_氯有机污染物残留的样品前处理方法_佟玲.doc

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——————————————————————————————————————————————— 用于气相色谱和气相色谱_质谱测定_省略_氯有机污染物残留的样品前处理方法_佟玲 2011年3 月 March2011ChineseJournalofChromatographyVol.29No.3228~233研究论文DOI:10.3724/SP.J.1123.2011.00228 用于气相色谱和气相色谱-质谱测定植物样品中 含氯有机污染物残留的样品前处理方法 佟玲,杨佳佳,吴淑琪* (国家地质实验测试中心,北京100037) MS)测定植物样品中摘要:根据植物样品中的主要干扰物质,建立了用于气相色谱(GC)和气相色谱-质谱联用(GC- 含氯有机污染物残留的样品前处理方法,有效提高了对植物样品中有机氯农药及多氯联苯检测的灵敏度。采用均 考察了凝胶渗透色谱(GPC)和固相萃取(SPE)对提取液的净化效果。结果发现,采用质提取法对样品进行提取, GC测定目标物时,MS测定目标物时,提取液需经GPC和SPE两次净化;而采用GC-仅用SPE一次净化即可。该方法快速、经济、灵敏,适合多种植物样品中有机污染物残留分析的样品前处理要求。 关键词:气相色谱;气相色谱-质谱;样品前处理;有机氯农药;多氯联苯;植物 中图分类号:O658文献标识码:A8713(2011)03-0228-06文章编号:1000- Samplepretreatmentfordeterminationofchlorinatedorganic pollutantsinplantsbygaschromatographyand gaschromatography-massspectrometry TONGLing,YANGJiajia,WUShuqi* (NationalResearchCenterforGeoanalysis,Beijing100037,China) Abstract:Thesamplepretreatmentmethodsforthedeterminationofchlorinatedorganicpollutantsinplantsbygaschromatography(GC)andGC-massspectrometry(MS)wereestablished.Thehomogene-ousextractionwasusedtoextractthechlorinatedorganicpollutantsfromplants.Themaininterferencesintheco-extractfromseveralkindsofplantsampleswererecognized.Thesensitivityoftheanalysisonor-ganochlorinepesticidesandpolychlorinatedbiphenyls(PCB)inplantsampleswaseffectivelyimproved.Theremovalefficiencyoftheinterferencesfromtheextractbygelpermeationchromatography(GPC)andsolid-phaseextraction(SPE)wasinvestigated.Theimpuritiessuchasfattyacidsandphenolscanbecleaned-upthroughaCarb/NH2SPEcolumnwith20mLmixedsolventofhexane-ethylacetate(8∶2,v/v)in3%tolueneastheeluent,andtherecoverieswerehigherthan74%.ItwasnecessarytocombineGPCwithSPEastheclean-upmethodwhenthesamplewasdeterminedbyGC,andonlytheSPEastheclean-upmethodwasusedifamassspectrometerwasemployedasadetector.Themethodsarerapidandsensitive,andcanbeusedintheanalysisoforganicpollutantresiduesinplantsamplesefficiently. Keywords:gaschromatography(GC);gaschromatography-massspectromet
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