干洗场所空气中TCE、PCE气相色谱测定方法研究

A Method for Study TCE, PCE in the Air of Workplace

本文提出用活性碳管吸附、以二硫化碳溶剂解吸、气相色谱氢火焰离子化检测器分析测定干洗场所空气中三氯乙烯 (TCE)、四氯乙烯 (PCE) ,色谱条件 :色谱柱长 2米、内径 3mm不锈钢柱 ,填充聚乙二醇6 0 0 0∶6 2 0 1红色担体 (6 0— 80目 ) =5∶10 0 ,柱温 96℃ ,气化室 170℃ ,氢火焰离子化检测器 170℃ ,载气流量N2 2 0ml/min ,线性范围TCE 0 .10— 0 .6 0mg/ml,PCE 0 .10— 2 .0 0mg/ml,相关系数 0 .9995— 0 .9997,检出限TCE 0 .14ug/ml,PCE 1.4ug/ml,方法的精密度TCE 2 0、10 0、2 0 0ug/ml标准溶液分析 ,变异系数分别为1.2 9%、2 .6 2 %、1.2 2 % ,PCE 14、15 5、2 90mg/L标准溶液分析 ,变异系数分别为 3 .76 %、1.82 %、1.6 8% ,稳定性PCETCE在活性碳管中 7天内稳定 ,变异系数 0 .6 5— 3.2 1% ,回收率 91.0— 10 8.4% ,二硫化碳对TCEPCE的解吸效率 91.12— 10 6 .1% ,测定中与PCETCE共存物质二氯甲烷、三氯甲烷、苯、甲苯不干扰目标组分测定。方法适用于日常卫生监督监测工作 ,可同时测定作业场所空气中三氯乙烯。

Trichloroethylene (TCE) and tetrachloroethylene (PCE) in the air of workplace was first collected by active carbon tube, then eluted with carbon disulfide, finally detected by hydrogen flame detector. Chromatography factors: column L=2m, Di=4mm, filed polyethylene glycol 6000:6201=5:100, Tc=96℃,gasified room 170℃, FID 170℃, carrier flow N 2 20ml/min. The results showed: liner range: TCE 0.10-0.60mg/ml, PCE 0.10-2.0mg/ml, r=0.9995-0.997. Deletion limit: TCE 0.14ug/ml, PCE 1.4ug/ml. RSD(%): detected by TCE 20, 100, 200ug/ml standard solution, the variable coefficients were 1.29%, 2.62%, 1.22%. Detected by PCE 14, 155, 290ug/ml standard solution, the variable coefficients were 3.76%, 1.82% and 1.68%. Stability: TCE PCE in active carbon tube could be stable for 7 days. The variable coefficients were 0.65-3.21%. Desorption rate were 91.0-108.4%. The elution rate with carbon disulfide was 91.12-106.1%. Dichloromethane, trichloromethane, benzene, toluene may coexist with TCE PCE. But they do not disturb determination. This method could be applied to routine health supervision and determination.