实验室中有害气体苯、甲苯、甲醇和丙酮的检测分析

The Analysis and Detection of Harmful Gas Benzene、Toluene、Methanol and Acetone in Laboratory

目的采用气相色谱法检测实验室空气中苯,甲苯,甲醇和丙酮的含量。方法在每个月的上中下旬个选择一天,以DMF(N,N-二甲基甲酰胺)为吸收剂,采用气泡吸收管收集实验室内空气,气相色谱法测定(DM-WAX毛细管柱,FID检测器)。结果实验室中苯,甲苯,甲醇和丙酮分离良好,苯加标回收率为97.88%,甲苯加标回收率为98.73%,甲醇加标回收率为98.99%,标回收率为97.08%,相对标准偏差苯为0.81%,甲苯为0.72%,甲醇为0.67%,丙酮为0.06%。苯检出限7.19×10-3mg/ml,甲苯检出限7.2×10-9mg/ml,甲醇检出限为8.78×10-8mg/ml,丙酮检出限为8.39×10-10mg/ml。结论该法简便,快速,重现性好,灵敏度高,适合实验室中苯,甲苯,甲醇,丙酮的检测。

Objective We adopt gas chromatography to detect contents of benzene, toluene, methanol, acetone in laboratory. Methods In the early, middle and late in each month, this experiment selects a day, using DMF （N, N-dimethyl formamide） absorption, bubble absorption tube to collect the air in the laboratory, Gas Chromatography get the results （the DM-WAX capillary column material, the FID detector）. Re- suits In the laboratory benzene, toluene methanol and acetone separation are good. Benzene recovery was 97. 88%, toluene rccovcry was 98.73%, methanol recovery was 98.99%, acetone recovery was 97.08%, relative standard deviation of benzene was 0. 85%, toluene was 1.41%. methanol was 0. 67 %, acetone was 0.06 %. Benzene detection limit was7.19 × 10^-3 mg/ml, toluene detection limit was 7.2 × 10^-9 nag/ ml, methanol detcction limit was 8. 78 × 10^-8 mg/ml, acetone detection limit was 8.39 × 10^-10 mg/ml. The method is simple, fast, good reproduc-ibility, high sensitivity, suitable for the detection of benzene, toluene in the laboratory.