氧化银沉淀-离子色谱法测定盐湖水中的氟离子、硝酸根和硫酸根

我国盐湖资源丰富,盐湖水中的氟离子、氯离子、硝酸根和硫酸根的准确测定对盐湖资源的开发具有重要的意义。采用离子色谱法测定盐湖水中的阴离子时,高浓度氯离子会对氟离子、硝酸根和硫酸根的测定造成干扰。本研究以氧化银为沉淀剂,有效去除高浓度的氯离子,通过阳离子交换树脂有效控制了溶液的pH,提高了氟离子、硝酸根和硫酸根的测量准确性。3种离子的加标回收率均在91.3%~108%之间,且方法操作简单,适用于盐湖水中阴离子的分析。

Determination of fluoride,nitrate and sulfate in brine by Silver Oxide Precipitation-Ion Chromatography

China is rich in salt lake resources.The determination of fluorine,chloride,nitrate and sulfate ions in brine is of great significance for the development of salt lake resources.When using ion chromatography to analyze the anions in brine,the high chloride ion concentration will affect the determination of fluoride,nitrate and sulfate ions.In this study,silver oxide was used as precipitant to effectively remove the high concentration of chloride ions,and the pH of the solution was adjusted by the cation exchange resin,which has improved the measurement accuracy of fluoride,nitrate and sulfate ions.The recovery of the three ions was 91.3%~108%.The method is simple to operate,suitable for the analysis of anions in brine.