工作场所空气中1,2-二氯乙烷的毛细管柱气相色谱测定法

Capillary Column Gas Chromatography in Determining Dichloroethane in the Air of Workplaces

目的建立工作场所空气中1，2-二氯乙烷毛细管柱气相色谱测定方法。方法按照《车间空气监测检验方法研究规范》的要求进行实验室实验及现场实验。结果方法在0～0．36μg／ml范围内呈现线性关系；样品在炭管中至少可保存8d，方法的重现性好，不同浓度的相对标准偏差为1．1％～2．0％；活性炭管对1，2-二氯乙烷的吸附效果良好，100mg活性炭对1，2-二氯乙烷的穿透容量大于13．2mg，当1，2-二氯乙烷的浓度为22．7～112．4mg／m^3时，采样效率均达99．69％～100％；平均解吸效率为85.6％～89．4％；方法的最低检测浓度为0．66mg／m^3；空气中与1，2-二氯乙烷共存二氯甲烷、甲苯、正己烷、三氯甲烷、三氯乙烯等在该方法条件下不干扰测定。结论该方法各项指标均达到《车间空气监测检验方法研究规范》的要求，适用于工作场所空气中1，2-二氯乙烷的现场监测。

[Objective] To establish capillary column gas chromatography for detennining dichloroethane in the air of workplaces. [ Methods]Laboratory experiment and experiment on site were conducted according to the demand of ＂Standardization of Methods for Determining Substances in the Air of Workplaces＂. [Results]This method presents linear relation within 0 - 0.36μg/ml. The samples can be stored in the active carbon tube for at least 8 days. The RSD was 1.1% - 2.0% ; the breakthrough capacity was over 13.2mg per 100mg absorbent charcoal; the absorption efficiency was 99.69% - 100% ; the average desorption efficiency was 85.6% - 89.4% ; the lowest deteetian limit was 0.66 mg/m^3. Other relative organic solvents like dichloremethane, toluene, n - hexanes and trichloroethylene didn＇t interfere rite determination. [ Conclusion] All the indexes of this method accord with the demand in the ＂Standardization of Methods for Determining Substances in the Air of Workplaces＂ ; it is applicable for determining dichloroethane in the air of workplaces.