进样溶剂极性对地下水中有机氯农药色谱行为的影响

百花草

[align=justify]摘　要：地下水中有机氯农药分析时采用正己烷为进样溶剂,而考核样品的溶剂通常为甲醇.正己烷和甲醇分别是典型的非极性溶剂和极性溶剂.文章研究了正己烷和甲醇两种溶剂对地下水中9种必测有机氯农药(六氯苯、α-六六六、β-六六六、γ-六六六、δ-六六六、p,p′-DDE、p,p′-DDD、o,p′-DDT、p,p′-DDT)色谱行为的影响.结果表明,溶剂的极性对有机氯农药的响应值有显著的影响:甲醇为进样溶剂时,由于极性强,造成汽化室内活性位点的暴露,导致某些待测组分被活性位点吸附,甲醇相的待测物响应值明显低于正己烷相待测物响应值.
关键词：溶剂极性;汽化室;有机氯农药;灵敏度;地下水
分类号：O657.71;S482.32 　文献标识码：A
文章编号：0254-5357(2009)01-0021-04

Effect of Polarity of the Injection Solvents on the Gas Chromatographic Behaviors of Organochlorine Pesticides in Groundwater Samples

SONG Shu-ling　 HU Kou-kou　 RAO Zhu　

基金项目：国家地质实验测试中心基础性研究--地下水中有机氯农药高灵敏度分析方法项目资助(200607CSJ09) 作者简介：宋淑玲(1978-),女,陕西延安人,助理研究员,主要从事有机分析研究工作.E-mail: songshuling163@163.com 作者单位：宋淑玲（国家地质实验测试中心,北京,100037）　 　　　　　胡蔻蔻（中国矿业大学,北京,100083）　 　　　　　饶竹（国家地质实验测试中心,北京,100037）　 参考文献： [align=justify][1]Zhang Maosheng,Huang Jiarong,Wei Changlin,Yu Binbin,Yang Xiaoqing,Xi Chena.Mixed liquids for single-drop microextraction of organochlorine pesticides in vegetables[J].Talanta,2008,74:599-604. [2]Moreno D V,Ferrera Z S,Santana J J R.SPME and SPE comparative study for coupling with microwave-assisted micellar extraction in the analysis of organochlorine pesticides residues in seaweed samples[J].Microchemical Journal,2007,87:139-146. [3]Wang Wentao,Meng Bingjun,Lu Xiaoxia,Liu Yu,Tao Shu.Extraction of polycyclic aromatic hydrocarbons and organochlorine pesticides from soils:A comparison between Soxhlet extraction,microwave-assisted extraction and accelerated solvent extraction techniques[J].Anal Chim Acta,2007,602:211-222. [4]史双昕,黄业如.我国水环境中有机氯杀虫剂类POPs的研究进展[J].癌变·畸变·突变,2007,19(3):194-198. [5]Zawiyah S,Che Man Y B,Nazimah S A H,Chin C K,Tsukamoto I,Hamanyza A H,Norhaizan I.Determination of organochlorine and pyrethroid pesticides in fruit and vegetables using SAX/PSA clean-up column[J].Food Chemistry,2007,102:98-103. [6]Zawiyah S,Che Man Y B,Nazimah S A H,Chin C K.Determination of organochlorine and pyrethroid pesticides in fruit and vegetables using solid phase extraction clean-up cartridges[J].Journal of Chromatography A,2006,1127:254-261. [7]Xue Jian,Hao Lili,Peng Fei.Residues of 18 organochlorine pesticides in 30 traditional Chinese medicines[J].Chemosphere,2008,71(6):1051-1055. [8]Ma?tovská K,Lehotay S J.Evaluation of common organic solvents for gas chromatographic analysis and stability of multiclass pesticide residues[J].Journal of Chromatography A,2004,1040:259-272. [9]LeBel G L,Williams D T.Determination of hexachlo-rocyclopentadiene at the nanogram per liter level in drinking water[J].Journal of the Association Official Analytical Chemists,1979,62:1353-1361. [10]Anastassiades M,Ma tovsk K,Lehotay S J.Evalua-tion of analyte protectants to improve gas chromatographic analysis of pesticides[J].Journal of Chromatography A,2003,1015:163-184.