热脱附-气相色谱法测定空气中的总挥发性有机化合物研究

摘要

建立了热脱附-毛细管气相色谱法测定空气中苯、甲苯、乙酸丁酯、乙苯、对/间二甲苯、邻二甲苯、苯乙烯和十一烷等挥发性有机物的检测方法。九种挥发性有机物在一定浓度范围内标准曲线线性良好，相关系数均在0.997～0.999之间。检出限在0.002～0.005 mg/m3（采样体积1.0 L计）。用该方法检测了企业产生的有机废气及厂区周边环境空气，实验结果表明该方法灵敏度高、操作简单、重现性好、准确可靠，能够满足对实际样品的分析要求。%This paper developed a method for determination of TVOC including benzene , toluene, butyl acetate, ethyl ben-zene, p/m-xylene, o -xylene, styrene, undecane using thermal desorption -gas chromatography.The related coefficient of standard curves was 0.997~0.999, and the detection limit was 0.002~0.005 mg/m3 when sampling volume reached 1.0L.The results showed that this method was more sensitive, easy to operate, and its repeatability was much better and its measurement re-sults were more accurate and reliable.Thus, it is suitable for TVOC determination.