气相色谱法测定车用汽油中的有机氯化物

Qualitative and Quantitative analysis of organic chlorides in gasoline by GC-ECD

采用配有电子捕获检测器的气相色谱仪（GC-ECD）对不同来源的车用汽油样品中的有机氯化物进行定性和定量分析。9种有机氯化物的氯含量在各自检测范围内线性关系良好,其线性相关系数均达到0.998以上,检出限为0.01-0.94mg/L。结果表明,车用汽油中的有机氯化物主要为二氯甲烷（CH2Cl2）、氯丙烯（C3H5Cl）、三氯甲烷（CHCl3）、1,2-二氯乙烷（C2H4Cl2）、1,2-二氯丙烷（C3H6Cl2）、三氯乙烯（C2HCl3）、四氯乙烯（C2Cl4）等,其他有机氯化物的含量较少。各种氯化物中氯含量的相对标准偏差均在3%以内,加标回收率在92.5%-114%之间,能够满足车用汽油中有机氯化物的日常检测需求。

The qualitative and quantitative analysis method（ GC-ECD） for organic chlorides in gasoline is developed. Under the optimized conditions,the linearities of 9 organic chlorines were good in their detection range,the correlation coefficients of them were above 0. 998,and the limits of detection were 0. 01 - 0. 94 mg / L.Through analysis of different gasoline,it is known that the main organic chlorides in gasoline were dichloromethane,chloropropene,trichloromethane,1,2-dichloroethane,1,2-dichloropropane,trichloroethylene,tetrachloroethylene etc. The amount of other kinds of chloride was very low. The relative standard deviation（ RSD） of all kinds of organic chloride by GC-ECD was less than 3 %; the recovery was found to be in the range of 92. 5 % -114 %. The method could meet the demand of conventional chromatographic analysis.