论文部分内容阅读
[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。
[Objective] To explore and improve the rapid quantitative detection of benzene series in the air. [Method] Adsorption conditions and various parameters of extraction heads were analyzed by using multi-component benzene series standard gases. The detection methods and competitive adsorption behaviors of solid phase micro-extraction for benzene series in the air were studied. [Result] The highest extraction efficiency was carbon molecular sieve / polydimethylsiloxane (CAR / PDMS). The higher the boiling point was, the higher the competiveness of the benzene series on the extraction head was. At 2 ~ 42.5 mg / m3 Concentration range, the standard gas adsorption capacity showed a certain linear relationship with the concentration. [Conclusion] Solid phase microextraction technology is affected by many factors in the application of quantitative determination of benzene series in the air. There are significant competitive adsorption effects of various benzene series on the surface of the extraction head, making it more difficult to quantify.