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文献中叙述过的在镀镍溶液中测定硼酸的方法,是根据使镍以碳酸盐的形式经二次重沉淀而分离,并以甲基红为指示剂中和碳酸钠以后,于滤液中用酚酞作指示剂,在转化糖、甘露醇或甘油的存在下用碱滴定法测定硼酸。这个方法至少需要八小时的时间,因此是不太适用的。另一文献中介绍过较简单的镀镍溶液中测定硼酸法,这个方法是使镍在亚铁氰化盐沉淀的形式下滴定硼酸;这样作可以省去重沉淀、过滤和洗滌碳酸镍的手续飧龇椒梢栽趌5—20分钟内完成。不过准确地
The method described in the literature for the determination of boric acid in a nickel plating solution is based on the separation of nickel as a carbonate by secondary precipitation and the neutralization of sodium carbonate with methyl red as an indicator, Using phenolphthalein as an indicator, boric acid is determined by alkaline titration in the presence of invert sugar, mannitol or glycerol. This method requires at least eight hours, so it is not suitable. Another literature describes a simpler method for the determination of boric acid in nickel-plating solutions by titrating boric acid with nickel in the form of precipitation of ferrocyanide; this eliminates the need for heavy precipitation, filtration and washing of nickel carbonate 飧 龇 pepper tip tip planted 趌 5-20 minutes to complete. But exactly