毛细管气相色谱法同时检测工作场所空气中三氯乙烯和四氯乙烯

摘要

A method was established for simultaneous determination of trichloroethylene, tetrachloroethylene in the atmosphere by solvent desorption capillary gas chromatography. After being collected by activated carbon cube and desorpted with carbon disulfide, samples of atmosphere were determined by capillary gas chromatography. Under the conditions of 1.5 L sampling volume and 1.0 mL desorption volume, the linear range of trichloroethylene, tetrachloroethylene in the air was 0–212,0–204μg/mL, respectively. The linear correlation coefficients were all more than 0.999 9. Therelative standard deviations were less than 2.5%(n=6). The detection limits were 0.90, 1.15μg/mL, respectively. The minimum detectable concentration was 0.6,0.8 mg/m3, respectively. The desorption efficiency was 96.1%–98.1%. The method is simple with good separation effect, good linear amd short detection time, which is suitable to determine trichloroethylene, tetrachloroethylene in the atmosphere.%建立大气中三氯乙烯、四氯乙烯的溶剂解吸毛细管气相色谱测定方法。大气样品用活性炭管采集后以二硫化碳解吸，再用毛细管气相色谱法进行测定。在采样体积为1.5 L，解吸体积为1.0 mL的条件下，空气中三氯乙烯、四氯乙烯的线性范围分别为0～212μg／mL，0～204μg／mL，线性相关系数均大于0.9999，测定结果的相对标准偏差均小于2.5%（n=6），最低检出限分别为0.90，1.15μg／mL，最低检出浓度分别为0.6，0.8 mg／m3，解吸效率为96.1%～98.1%。该法操作简便，分离效果好，检测时间短，适于空气中三氯乙烯和四氯乙烯的检测。