Tang Hongmao, Beg Khaliq R, Al-Otaiba Yousef
Urban and Environment Division, Coastal and Air Pollution Department, Kuwait Institute for Scientific Research, P.O. Box 24885, 13109 Safat, Kuwait.
ScientificWorldJournal. 2006 May 12;6:551-62. doi: 10.1100/tsw.2006.111.
Kuwait experiences desert climatic weather. Due to the extreme hot and dry conditions in this country, some analytical phenomena have been discovered. Therefore, a systematic study of sampling and analyzing volatile organic compounds in air by using GC-MS with a cryogenic trap is reported in this paper. This study included comparisons of using different sample containers such as Tedlar bags and SUMMA canisters, and different cryogenic freezing-out air volumes in the trap. Calibration curves for different compounds and improvement of replicated analysis results were also reported here. The study found that using different sample containers produced different results. Analysis of ambient air samples collected in Tedlar bags obtained several volatile organic compounds with large concentrations compared to using SUMMA canisters. Therefore, to choose a sample container properly is a key element for successfully completing a project. Because GC-MS with a cryogenic trap often generates replicated results with poor agreement, an internal standard added to gas standards and air samples by using a gas syringe was tested. The study results proved that it helped to improve the replicated results.
科威特属于沙漠气候。由于该国极端炎热干燥的气候条件，发现了一些分析现象。因此，本文报道了一项利用带有低温捕集阱的气相色谱 - 质谱联用仪对空气中挥发性有机化合物进行采样和分析的系统研究。该研究包括比较使用不同的样品容器，如泰德拉袋和苏玛罐，以及捕集阱中不同的低温冷冻空气体积。本文还报道了不同化合物的校准曲线以及重复分析结果的改进情况。研究发现，使用不同的样品容器会产生不同的结果。与使用苏玛罐相比，对收集在泰德拉袋中的环境空气样品进行分析得到了几种浓度较高的挥发性有机化合物。因此，正确选择样品容器是成功完成一个项目的关键因素。由于带有低温捕集阱的气相色谱 - 质谱联用仪常常产生一致性较差的重复结果，因此测试了通过气体注射器向气体标准品和空气样品中添加内标物的方法。研究结果证明，这有助于改善重复结果。
