汽油中苯的测定

采用高分辨毛细管气相色谱对汽油中的苯进行测定。在汽油样品组分中选定一组分为内标，测定样品后再用内加法添加苯，再次测定，并以两次测定的峰面积数据计算苯量。本文在汽油辛烷值的测定基础上，发展了一种新的汽油中苯量的测定方法：采用国产色谱仪，带内标的内加法即可对汽油中的苯量进行准确测定．在不同标号的汽油测定实验中，相对标准偏差不超过3％。与国标方法相比，该方法简便快速，对仪器设备要求低，提高了分析效率，降低了分析成本，便于推广。

Determination of benzene in gasoline by high-resolution gas chromatography

An efficient method for the determination of benzene in gasoline has been found. High-resolution gas chromatograph(HRGC) made in China was applied to analysis in gasoline samples.In National Standard Methods of China,the determination of bezene is complicated,and the calculation of data is time-consuming.A new method was developed in the paper.By using standard addition method combined with internal standard method together,the gasoline samples were analyzed by first order programmed temperature gas chromatography.The relative standard deviation of results was about 3%,which satisfys the requirement of ordinary demand of determination of benzene.Compared with methods used before,this method is fast and efficient,and it is not necessary for much higher performance of GC instrument.So the method enhances efficiency while lowers the cost of analysis.