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目的:建立溶剂解吸-毛细管柱气相色谱法测定工作场所空气中邻甲酚。方法:对工作场所空气中邻甲酚用硅胶采样管采样,丙酮解吸,DB-FFAP毛细管柱分离,火焰离子化检测器检测,标准曲线法定量。结果:邻甲酚浓度在0.0μg/ml～200μg/ml范围内呈线性关系,回归方程为y=21.48C-7.796,相关系数r=0.9999;方法检出限为0.3μg/ml,最低检出浓度0.04 mg/m3(以采集7.5L空气计)。解吸效率为87%～102%,相对标准偏差(RSD)为2.3%～5.4%。高、中、低浓度的标准重复测定的相对标准偏差(RSD)均小于1%,样品在硅胶采样管中于冰箱下至少可保存7 d。结论:建立的方法灵敏度很高、快速准确,操作简单,可以应用于工作场所空气中邻甲酚的测定。
Objective: To establish a solvent desorption - capillary gas chromatography for the determination of o-cresol in the workplace. Methods: o-cresol in the air of the workplace was sampled by silica gel sampling tube, desorbed by acetone, separated by DB-FFAP capillary column, detected by flame ionization detector and quantified by standard curve method. Results: The calibration curve of o-cresol was linear in the range of 0.0μg / ml ~ 200μg / ml. The regression equation was y = 21.48C-7.796, the correlation coefficient was 0.9999. The detection limit was 0.3μg / ml. Concentration 0.04 mg / m3 (to collect 7.5 L air meter). Desorption efficiency of 87% to 102%, relative standard deviation (RSD) of 2.3% to 5.4%. The relative standard deviations (RSDs) of standard, repeat, high, medium and low concentrations were all less than 1%. Samples were stored in a silica gel tube for at least 7 days under the refrigerator. Conclusion: The established method has high sensitivity, fast and accurate, simple operation and can be applied to the determination of o-cresol in the air of the workplace.