溶剂解吸气相色谱法测定空气中辛烷的实验研究  

Experimental research on gas chromatographic determination for octane desorbed by sovent in the workplace air

作　　者：赵文良[1] 李颐[1] 熊维维[1] 

机构地区：[1]上海市静安区疾病预防控制中心,上海200042

出　　处：《上海预防医学》2005年第2期67-70,共4页Shanghai Journal of Preventive Medicine

摘　　要：[目的 ]　研究炭管采集空气中辛烷的气相色谱分析方法。　 [方法 ]　活性炭吸附空气中辛烷 ,样品经溶剂解吸 ,色谱检测。　 [结果 ]　当空气中辛烷浓度范围在 175～ 70 0mg/m3 (参照国标PC -TWA 5 0 0mg/m3 )时 ,方法的变异系数为 1.8% ;回归方程式Y =13 9+4 .97X ,相关系数r =0 .9994。最低检测限 0 .13 μg(进样 1.0 μl)。平均解吸效率为 98.2 % ,穿透容量 (BTV)为 13 .7mg。活性炭吸附 991μg的辛烷 ,样品放置 2周 ,回收率仍可达 96.6% ,变异系数为1.5 %。本法的测定范围上限取决于炭管的吸附量 ,而该吸附量可随空气中辛烷的浓度及其它物质而变化。　 [结论 ]　本方法可应用于车间环境中辛烷浓度的测定 。Objective To study the use of gas chromatographic (GC) analytical method for octane in the workplace air using charcoal tube for sampling. Charcoal was used to adsorp octanein air, sample was desorpted by solvent and analyied by GC(FID). The coefficient of variation for the whole analytical method was in the range of 175～700mg/m3 was 1.8%.Regression formula was y=139+4.97X, r=0.9994.Determination limit was 0.13μg(injection for 1.0μl ).Desorption efficiency was 98.2%,breakthrough volume(BTV) was 13.7mg.After taking 991μg of octane in the charcoal tube and two weeks storage, its recovery efficiency was 96.6%. The upper detection limit of the method was dependent on the desorptive capacity of the charcoal tube.This capacity varies with the concentration of octane and other substances in the air. [Conclusion] This method can be used to determine the concentration of octane in workplace air by simply changing gas chromatographic conditions from isothermal to a temperature programmed mode of operation. It can determine simultaneously two or more substances of the workplace air.

关 键 词：辛烷 炭管 溶剂解吸 穿透容量 气相色谱 辛烷 炭管 溶剂解吸 穿透容量 气相色谱 

分 类 号：R122.11[医药卫生—环境卫生学]