›› 2015, Vol. 46 ›› Issue (12): 94-97.

• 分析与评定 • 上一篇    下一篇

X射线荧光光谱法测定汽油中的氯含量

顾海波,张大华,雷秦睿,谢燕红   

  1. 中国石油兰州润滑油研究开发中心
  • 收稿日期:2015-05-06 修回日期:2015-06-16 出版日期:2015-12-12 发布日期:2015-11-26
  • 通讯作者: 顾海波 E-mail:guhaibo_rhy@petrochina.com.cn

DETERMINATION OF CHLORINE CONTENT IN GASOLINE BY X-RAY FLUORESCENCE SPECTROMETRY

  • Received:2015-05-06 Revised:2015-06-16 Online:2015-12-12 Published:2015-11-26

摘要: 介绍了一种利用X射线荧光光谱法测定汽油中氯含量的方法。在管电压为25 kV、管电流为1.0 mA 的最佳实验条件下,氯质量分数在10?1 000 μg/g范围内与荧光强度呈良好的线性关系。主要考察石油醚与甲苯体积比为6:4的混合物、异辛烷、市售氯标样3种基体对汽油中氯含量测定结果的影响,并绘制了各自的标准曲线,方程式分别为y=0.158 4x—48.90,y=0.210 1 x—58.16,y=0.205 4 x—63.12;线性相关系数分别为0.999 8,0.999 9,0.999 9;确定了最佳基体为异辛烷。对该方法进行了准确性和重复性考察,不同牌号汽油和氯形态样品测试结果的回收率均为95%?105%,方法的相对标准偏差小于4.2%。

关键词: X-射线荧光光谱, 氯含量, 汽油, 基质

Abstract: A method for determining chlorine content in gasoline by X-ray fluorescence analysis is introduced. At the best conditions of 25 kV and 1.0 mA, the chloride concentration in the range of 10-1 000 ug/g is linear with the fluorescence intensity. The influence of different substrates (mixture of petroleum ether and toluene (a valume ratio of 6:4 v/v), isooctane and commercially available chlorine standard sample)on the results of determination is studied, and their standard curves were established, respectively. It is found that the isooctane is the best substrate for the method. Precision and repeatability of the method were investigated. The effect of different gasoline and samples with different chlorine forms was invested. The results show that the recovery rate is between 95% and 105%, and the relative standard deviation is less than 4.2%.

Key words: X- ray fluorescence spectrometry, chlorine content, gasoline, substrate