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
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摘要:
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。
Abstract: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, 0.990 0, 0.006 0, 0.055 0, 0.630 0, and 0.300 0 mg/L, respectively, with correlation coefficients greater than 0.999 0 within the corresponding concentration range of 10-800 mg/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.
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