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目的建立工作场所空气中邻氯苯乙烯的热解吸气相色谱测定方法。方法将美国测定方法用的10%SP-1000填允色谱柱改为日常空气检验中常用的FFAP毛细管通用色谱柱。按照《工作场所空气中有毒物质检测方法研究规范》的要求进行实验。结果本方法在0～1 200μg/ml范围呈线性关系(r=0.999 9);样品在炭管中于4℃冰箱中可保存8 d;方法的重现性好,不同浓度的RSD为1.28%～1.97%;方法的最低检出限为0.52μg/ml;平均解吸效率为75.73%～86.96%;采样效率为98.17%～100.00%;100 mg活性炭对邻氯苯乙烯的穿透容量是6.6 mg;空气中与邻氯苯乙烯共存苯乙烯、对氯苯乙烯、间氯苯乙烯等在本方法条件下不干扰测定。结论本文所用方法各项指标均达到《工作场所空气中有毒物质检测方法研究规范》的要求,适用于工作场所空气中邻氯苯乙烯的现场监测。
Objective To establish a pyrolysis gas chromatographic method for the determination of o-chlorostyrene in workplace air. Methods The 10% SP-1000 fill-in column used in the U.S. method was changed to the common FFAP capillary column used in routine air tests. In accordance with the “workplace air toxic substances testing methods research” requirements of the experiment. Results The method was linear in the range of 0-1 200 μg / ml (r = 0.999 9). The samples were stored in a carbon tube at 4 ℃ for 8 days. The reproducibility of the method was good. The RSD of different concentrations was 1.28% ~ 1.97%. The detection limit of the method was 0.52μg / ml. The average desorption efficiency was 75.73% ~ 86.96% .The sampling efficiency was 98.17% ~ 100.00%. The permeation capacity of 100 mg activated carbon to o-chlorostyrene was 6.6 mg ; Air co-presence of o-chlorostyrene styrene, p-chlorostyrene, m-chlorostyrene, etc. in this method conditions do not interfere with the determination. Conclusions The indexes of the method used in this paper meet the requirements of the “Norms for the detection of toxic substances in workplace air” and are applicable to the on-site monitoring of o-chlorostyrene in the air of the workplace.