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一般镀镍溶液只含有硫酸根、氯根等阴离子以及不易解离的硼酸等,在用阳离子交换树脂分离除去溶液中所有阳离子后,用氢氧化钠标准溶液滴定所相应生成的无机酸和硼酸,可以连续测定出硫酸根含量(另外用硝酸银容量法测定出氯根含量)和硼酸含量,本方法易于掌握,效果良好。测定方法:1 离子交换柱的制备:在100毫升酸式滴定管底部装入少量玻璃丝,装入732型阳离子交换树脂,用2M盐酸洗涤后,用力摇动除去柱内的气泡,用中性水洗涤到对甲基红指示剂呈中性为止。2 测定程序:取25毫升镀液用水稀释1倍后注入交换柱内,以一滴接一滴的速度进行交换,用500毫升量瓶收集交换后的溶液和以后的洗涤溶液,交换完了后用中性去离子水约400毫升洗涤交换柱,稀释
General nickel plating solution contains only sulfate, chloride and other anions and boric acid is not easy to dissociate, etc., with cation exchange resin to remove all the cations in the solution after the titration with sodium hydroxide standard solution corresponding to the formation of inorganic acids and boric acid, The method can be used to determine the sulfate content (in addition, the chloride content is determined by the silver nitrate volumetric method) and the boric acid content. The method is easy to master and has good effect. Determination: 1 Preparation of ion exchange column: A small amount of glass fiber was placed in the bottom of a 100 ml burette, charged with 732 cation exchange resin, washed with 2M hydrochloric acid, vigorously shaken to remove bubbles in the column, washed with neutral water Methyl red indicator was neutral so far. 2 Determination program: Take 25 ml of the bath diluted with water 1 times into the exchange column, the drop by drop speed of exchange, with 500 ml volumetric flask to collect the exchange solution and the subsequent wash solution, after the exchange of neutral About 400 ml deionized water Wash the exchange column and dilute