离子色谱法测定电镀液中F^-和Cl^-

Determination of fluoride and chloride in electroplate liquid by ion chromatography

提出了离子色谱法检测电镀液中F-和Cl-的方法。根据高沸点酸置换低沸点酸,用硫酸作为蒸馏剂,在一定的温度下,将F-和Cl-一起蒸馏出进行分离和富集,消除了电镀液中大量共存离子的干扰和对色谱柱的污染。使用IonPacAS14A作为色谱柱,在合适的色谱条件下,F-和Cl-的色谱峰能很好地分离,其检出限分别为0.84μg/L和0.37μg/L,相对标准偏差F-小于7.3%,Cl-小于4.2%(n=10),加标回收率F-在91%~107%、Cl-在95%~105%之间(n=10),电镀液中共存离子对F-和Cl-的测定无干扰。方法用于电镀液中F-和Cl-的同时测定,具有很好的可行性和实用性。

An ion chromatographic method for the determination of fluoride and chloride in electroplate liquid was proposed. According to the high boiling acid can replace low boiling acid, by using sulfuric acid as distillation solvent, fluoride and chloride were distilled at certain temperature. Thus the interference caused by coexisting ions in the electroplate liquid and the poisoning of the chromatographic column could be eliminated after the separation and enrichment of F ˉ and Clˉ. With IonPae AS14A chromatographic column and under the suitable chromatographic conditions, the peaks of fluoride and chloride could be well separated. The detection limit of fluoride and chloride are 0.84 μg/L and 0.37 μg/L, the relative standard deviations of Fˉ and Clˉ are less than 7. 3% and 4.2% （n = 10） . The standard addition recoveries for Fˉ in the samples are 91%-107% and Clˉ are 95%--105% （n= 10）. The coexistent ions in electroplate liquid did not interfere in the determination of Fˉ and Clˉ. It is feasible and practical to determine fluoride and chloride in electroplate liquid.