气相色谱法测定工作场所空气中10种挥发性有机物

Determination of 10 Volatile Organic Compounds in Workplace Air by Gas Chromatography

[目的]建立同时测定工作场所空气中10种挥发性有机物含量的气相色谱检测方法。[方法]目标物采用活性炭管吸附和二硫化碳解吸,经Elite-XLB毛细管柱程序升温分离,气相色谱法氢火焰离子化检测器测定。[结果]苯、甲苯、二甲苯、环己烷、正庚烷、异丙醇、丙酮、丁酮、四氢呋喃和甲基丙烯酸甲酯的采样效率均大于90%,样品在室温下可保存5 d;检出限依次为0.110 0、0.660 0、0.120 0、0.580 0、0.008 9、0.990 0、0.006 0、0.055 0、0.630 0和0.3000 mg/L,在约10~800 mg/L浓度范围,相关系数均大于0.999 0;平均加标回收率范围在86.7%~102.4%之间,相对标准偏差范围在1.6%~5.9%之间。[结论]该方法简便快速,准确性好,灵敏度高,适用于工作场所空气中10种挥发性有机物的同时测定。

[ Objective ] To establish a method for the simultaneous determination of 10 kinds of volatile organic compounds in workplace air by gas chromatography. [ Methods ] Air samples were adsorbed by active carbon and desorbed by carbon bisulfide, followed by temperature programmed separation using Elite-XLB column, and finally quantified with flame ionization detector. [ Results ] The sampling efficiencies of benzene, toluene, xylene, cyclohexane, normal heptane, isopropyl alcohol, acetone, butanone, tetrahydrofuran, and methyl methacrylate were all greater than 90%, and the samples could be stored at room temperature for 5 days. The detection limits were 0.110 0, 0.660 0, 0.120 0, 0.580 0, 0.008 9, 0.9900, 0.006 0, 0.055 0, 0.630 0, and 0.3000mg/L, respectively, with correlation coefficients greater than 0.9990 within the corresponding concentration range of 10-800mg/L. The average recoveries of standard addition ranged between 86.7% and 102.4%, and the relative standard deviations were between 1.6% and 5.9%. [ Conclusion ] This simple method is highly efficient, accurate, and sensitive, which is applicable to the simultaneous determination of 10 kinds of volatile organic compounds in the air of workplace.