空气中苯系物在不同萃取头上的竞争吸附研究
Study on Competitive Adsorption of BTEXs on the SPME Coat in Air
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摘要:
目的 探索并提高对空气中苯系物的快速定量检测能力。 方法 采用多组分苯系物标准气体对萃取头的吸附情况和各种参数进行分析,对固相微萃取技术应用于空气中苯系物的检测方法和竞争吸附行为进行研究。 结果 萃取效率最高的萃取头为碳分子筛/ 聚二甲基硅氧烷(CAR/PDMS);沸点越高的苯系物在萃取头上的竞争力越强;在2~42.5 mg/m3 浓度范围,标准气体的吸附量随浓度呈一定的线性关系。 结论 固相微萃取技术在空气中苯系物定量检测的应用过程中受多种因素影响,各种苯系物在萃取头表面存在显著的竞争吸附效应,使定量较为困难。 Abstract:Objective To improve the capabilities of rapid quantitative detection for benzene homologues in air. Methods Adsorption analysis and evaluation of various parameters of solid-phase micro-extraction(SPME)technology on the extraction of multi-component standard benzene homologue gas (BETXs) standard gas were investigated. The detection methods and mutual competitive adsorption behaviour of benzene homologues on SPME coat were studied. Results The most efficient SPME coat is CAR/PDMS. Benzene homlogue with higher boiling point posses higher competitiveness in the extraction of the coat. Adsorption of standard gas in range of 2-42.5 mg/m3 increases with the concentration linearly. Conclusion Application of SPME technology for determining benzene homologues in air was influenced by many factors. Competitive adsorption among components in BETXs on the surface of extraction head makes more or less difficult for quantitative determination.
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