工作场所空气中氢化三联苯的采集及分析方法研究

Study of sample collection and analysis methods for the hydrogenated terphenyl in workplace air

目的建立工作场所空气中氢化三联苯的溶剂解吸气相色谱测定方法。方法按照工作场所空气中毒物检测方法的研制规范的要求进行实验,对空气中氢化三联苯通过活性炭管吸附,二硫化碳解吸,毛细管色谱柱分离,氢火焰离子化检测器(FID)检测,以保留时间定性,峰面积和定量。结果该方法在6～60μg/ml范围呈线性关系,最低检出限为1.2μg/ml,不同浓度的相对标准偏差为1.3%～2.0%,解吸效率为89.3%～95.4%,回收率96.5%～101.4%,采样效率为100%,100mg活性炭连同玻璃棉的穿透容量为6.7mg,样品在室温下可保存7天,空气中共存的联苯、邻、对、间三联苯不干扰测定。结论该方法各项指标均达到工作场所空气中毒物检测方法的研制规范要求,适用于工作场所空气中氢化三联苯的现场监测。

Objective To establish solvent desorption gas chromatographic method for determination of hydrogenated terphenyl in workplace air.Methods According to standards of methods for determination of toxic substances in workplace air,hydrogenated terphenyl in the air was first adsorbed by activated carbon,desorbed by carbon disulfide,and determined by gas chromatography,then quality was used with retention time and quantitation was used by the sums of peaks area.Results The method presented linear relationship within the ranges of 6 60μg /ml.The relative standard deviations（RSD） were 1.3%-2.0% and the detection limits were 1.2μg /ml.The desorption efficiencies were 89.3%-95.4%.Sampling efficiencies were 100% and the breakthrough volumes were beyond 6.7 mg in a 100 mg active carbon with glass wool.The samples in active carbon tubes could be stored for 7 days at room temperature and its repetition was good.Other solvents in the air such as coexisting diphenyl,ortho-,meta-,para-terphenyls had no interferences in this method.Conclusion The method could meet with the requirements of Standards of methods for determination of toxic substances in workplace air and be feasible for determination of hydrogenated terphenyl in workplace air.