离子色谱法测定油田添加剂中氯离子含量

Determination of chlorine ion in the oil field additives by ion chromatography

采用ICS-900型阴离子色谱仪,建立了一种快速准确测定不同油田添加剂中Cl-含量的方法。样品以氢氧化钠溶液为溶剂,经高温焙烧除去其中有机物组分,防止其对色谱柱的污染和对测定的干扰影响。用热水提取灰分中的Cl-,过滤定容后用离子色谱法测定其中Cl-含量。经实验优化条件后,在1.00~40.00 mg/L浓度范围内线性关系良好,相关系数r2=0.9995,方法检出限0.005mg/L。加标回收率均在99%以上,相对标准偏差(RSD)为1.1%~1.3%。经实验证明:此方法能便捷准确地测定不同油田添加剂中Cl-含量。

A method is presented to determine the content of the chlorine ion in the oil field additives based on ion chromatography. In order to eliminate the pollution to chromatographic column and impact on the determination of the interference,we use sodium hydroxide as solvent,after high temperature calcination to remove organic matter with color components. Then with hot water extraction content of chloride ions in ash,the capacity after the filter with ion chromatography determination of the chlorine ion content. Under the optimum experimental conditions,the detection limit of this method was 0.005 mg/L. The linear range was from 1.00 to 40.00 mg/L with r2=0.9995. The average recoveries were all above 99%. The relative standard(RSD)was from 1.1% to 1.3%. The developed method is simple,fast and applicable for analysis of the content of chloride ion in oil field additives.