工作场所空气中1，1-二氯-1-硝基乙烷的气相色谱测定法

Determination of 1, 1-dichloro-l-nitroethane in air of workplaces by Gas Chromatography

目的建立工作场所空气中1，1-二氯-1-硝基乙烷的气相色谱测定方法。方法活性炭管采集工作场所空气中的1，1-二氯-1-硝基乙烷，以二硫化碳解吸后毛细管柱气相色谱法测定。结果方法的测定范围为4．0—-58．2μg/ml；回归方程Y=283X-1076，相关系数r=0．9999；最低检出浓度为0．4mg／m^3（以采集3L空气样品计）；不同浓度测定的相对标准偏差（RSD）为1．8％-4．1％（批内精密度试验的RSD分别为2．9％、1．8％和2．0％；批间精密度试验的RSD分别为4．1％、3．5％和3．2％）；解吸效率为88．5％～90．6％；穿透容量大于0．7mg；采样效率100％；样品在室温下至少可保存7d。结论方法的各项指标均符合GBZ／T210．4—2008《职业卫生标准制订指南-工作场所空气中化学物质测定方法》要求，可用于工作场所空气中1，1-二氯-1-硝基乙烷的测定。

Objective To establish a gas chromatography method for detecting the concentration of 1,1-dichloro-1-nitroethane in air of workplaces. Method 1,1-dichloro-1-nitroethane in air of workplaces was collected by activated charcoal tube, absorbed using carbon disulfide and analyzed by Gas Chromatography （FID）with FFAP capillary column. Results The linear rang of 1,1-dichloro-1-nitroethane in this method was 4.0-858.2 μg/ml, the linear regression formula was Y=283X-1076, the correlation coefficient was 0.9999, the lowest detection concentration was 0.4 mg/m3 （3L sampling air）, the relative standard deviation （RSD） wasl.8%- 4.1%, the desorption efficiency was 88.5%-90.6%, the breakthrough volume was 〉0.7 mg, the sampling efficiency was 100%, the samples could be kept at ambient temperature for at least 7 days. Conclusion The indicators of this method were conformed to the requirements of ＂Guide for establishing occupational health standards-Determination methods of air chemicals in workplace＂. This method could be used to detect 1,1-dichloro- 1-nitroethane in air of workplaces.