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目的改进工作场所空气中环己烷与甲基环己烷的溶剂解吸-气相色谱测定方法。方法采用活性炭管采集样品,二硫化碳解吸,经DB-1毛细管色谱柱分离,火焰离子化检测器检测,标准曲线法定量。结果本方法环己烷与甲基环己烷的质量浓度分别在1.0~1 402.2与0.8~1 999.4 mg/L范围内呈线性关系,相关系数均为0.999 9;检出限均为0.3 mg/L,定量下限分别为1.0和0.8 mg/L,最低检出浓度均为0.2 mg/m3,最低定量浓度分别为0.7和0.6 mg/m3(以采集1.5 L工作场所空气计);平均解吸效率分别为98.5%~99.3%和97.6%~99.0%;批内相对标准偏差(RSD)分别为0.36%~0.59%与0.34%~0.50%,批间RSD分别为0.89%~2.04%与0.87%~2.22%;样品在室温下可保存7 d。结论本方法灵敏度高,精密度好,操作简单,可用于同时测定工作场所空气中环己烷与甲基环己烷。
OBJECTIVE: To improve the solvent desorption of cyclohexane and methylcyclohexane in the air of the workplace - a gas chromatographic method. Methods Samples were collected by activated charcoal tube, carbon disulfide was desorbed, separated by DB-1 capillary column, detected by flame ionization detector and quantified by standard curve method. Results The mass concentration of cyclohexane and methylcyclohexane in this method was linear in the range of 1.0-1 402.2 and 0.8-1999.4 mg / L, respectively. The correlation coefficients were both 0.999 9. The detection limits were 0.3 mg / L, the lower limit of quantification was 1.0 and 0.8 mg / L, the lowest detected concentration was 0.2 mg / m3 and the lowest concentration was 0.7 and 0.6 mg / m3 respectively (to collect 1.5 L of workplace air); mean desorption efficiencies The relative standard deviations (RSDs) were 0.36% -0.59% and 0.34% -0.50%, respectively, and the inter-assay RSD were 0.89% -2.04% and 0.87% -2.22 %; Sample can be stored for 7 days at room temperature. Conclusion The method has high sensitivity, good precision and simple operation. It can be used for the simultaneous determination of cyclohexane and methylcyclohexane in the air of the workplace.