柱切换离子色谱法测定原油中盐含量

摘要

A fast determination method for salt content in crude oil by ion chromatography was de-veloped. The samples were extracted by high frequency oscillation extraction using mixture of water, ethanol,and xylene. The column-switching technique was then used on line to eliminate the interference of ethanol in extraction solution in chromatography analysis. Then the chloride was detected by ion chro-matography. The results show a great linear relationship in the concentration range from 0. 1 to 100 mg-NaCl/L,the correlation coefficient is greater than 0. 999. The detection limit for ion chromatography is 0. 01 mgNaCl/L based on signaloise ratio of 3. The difference between this method and the coulometry method is not significant. The column-switching ion chromatography can meet the analysis requirement of salt content in crude oil but much fast and simple.%建立了用离子色谱方法快速批量测定原油中盐含量的方法,通过手动高频震荡萃取后,利用柱切换技术在线消除萃取液中乙醇对离子色谱系统的干扰,然后经过离子色谱柱对无机氯化物进行分离分析,在优化的色谱条件下,盐质量浓度在0. 1～100 mgNaCl/L范围内线性相关系数均大于0. 999,离子色谱检出限为0. 01 mgNaCl/L(信噪比为3).该方法与现行标准方法电量法之间的差异不显著,可满足原油中盐含量的分析要求.