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目的探讨改进工作场所空气中异丙醇的溶剂解吸-气相色谱测定法。方法采用活性炭管采集样品,选用不同的解吸液解吸,HP-5毛细管色谱柱分离,火焰离子化检测器检测。结果采用体积分数为5%异丁醇-二硫化碳溶液解吸,平均解吸效率为101.50%~104.60%,批内相对标准偏差为0.28%~0.71%;异丙醇质量浓度在1.35~2 200.80 mg/L范围内呈线性关系,相关系数为0.999 9;方法检出限为0.40 mg/L,定量下限为1.35 mg/L,最低检出浓度和最低定量浓度分别为0.30和0.90 mg/m3(以采集1.5 L工作场所空气计);采用HP-5毛细管色谱柱可将样品中的乙醇干扰与异丙醇有效分离。结论采用体积分数为5%异丁醇-二硫化碳溶液进行解吸可以有效提高活性炭管中异丙醇的解吸效率,且方法灵敏度高,精密度好,适用于工作场所空气中异丙醇的测定。
Objective To investigate the solvent desorption-gas chromatographic method for the determination of isopropanol in workplace air. Methods Samples were collected by activated charcoal tube, desorbed by different desorption solutions, separated by HP-5 capillary column and detected by flame ionization detector. Results The average desorption efficiencies were 101.50% -104.60% by desorption with 5% isobutyl alcohol-carbon disulfide and the relative standard deviation was 0.28% -0.71%. The isopropanol concentration was 1.35-2.200.80 mg / L The detection limit was 0.40 mg / L, the lower limit of quantification was 1.35 mg / L, the lowest and the lowest concentration were 0.30 and 0.90 mg / m3 respectively L Workplace Air Meters); ethanol interference in samples can be effectively separated from isopropanol using HP-5 capillary columns. Conclusion The desorption efficiency of isopropanol in activated carbon tube can be effectively improved by 5% isobutyl alcohol-carbon disulfide solution desorption. The method has high sensitivity and good precision and is suitable for the determination of isopropanol in the air of workplace.