离子色谱法测定水中7种阴离子

建立了离子色谱法同时测定水中7种阴离子的方法。样品过滤后,采用IonPac AS-19阴离子色谱柱分离,KOH溶液梯度淋洗,电导检测器检测水中氟离子、亚氯酸盐、溴酸盐、氯离子、硝酸盐、氯酸盐、硫酸盐的含量。7种阴离子线性关系良好r0.998 8,加标回收率为91.6%~108%,相对标准偏差(RSD)为0.13%~8.8%。样品前处理简便,分离度和加标回收率均较高,适用于水中7种阴离子的测定。

Determination of Seven Types of Anions in Water by Ion Chromatography

A method for simultaneous determination of seven types of anions in water by ion chromatography was established. After water sample was filtered, it was separated using IonPac AS-19 anion chromatographic column with gradient elution by KOH solution. Afterwards, the amounts of fluoride, chlorite, bromate, chloride, nitrite, chlorate and sulfate were determined using an electrical conductivity detector (ECD). The correlation coefficients for the seven types of anions were more than 0.9988. The recoveries were 91.6% to 108% and RSDs were 0.13%~8.8%. This method has a simple sample pretreatment procedure. Both the degree of separation and the standard addition recovery were relatively high, which met the requirements for the determination of seven types of anions in water.