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贵刊76年3期15页发表的“镍电镀液的无毒分析方法”一文中,关于硫酸钠的测定,我们认为有下述问题:1 氯化钡加入量不足。以某厂滚镀液配方为例:NiSO_4·7H_2O 300gl~(-1)MgSO_4·7H_2O 25gl~(-1)Na_2SO_4·10H_2O 150gl~(-1)取5毫升电镀液,欲使硫酸根完全沉淀,至少需要加入0.02M 氯化钡溶液407毫升,而方法中只加入50毫升。2 紫脲酸铵与镁、锌及镉、亦形成黄色或橙色的络合物,但这些络合物的稳定度要小得多,因而在分析化学中应用不多。络合物稳定度降低的顺序是 Cu>Zn>Cd>Mg>Ca>Ba、Sr,钡及锶络合物极弱。方
In the article “Non-toxic Analysis of Nickel Electroplating Solution” published in Issue 3, Issue 15, Issue 76, Issue 3, page 76, we consider the following problems with the determination of sodium sulfate: 1 Insufficient barium chloride is added. Take a factory bath plating solution as an example: NiSO_4 · 7H_2O 300gl ~ (-1) MgSO_4 · 7H_2O 25gl ~ (-1) Na_2SO_4 · 10H_2O 150gl -1 take 5 ml of plating solution, to make the sulfate completely precipitation, At least 407 ml of 0.02 M barium chloride solution need to be added and only 50 ml is added to the process. 2 Ammonium urate and magnesium, zinc and cadmium, also formed yellow or orange complexes, but the stability of these complexes is much smaller, and therefore less used in analytical chemistry. The order of decreasing the stability of the complexes is Cu> Zn> Cd> Mg> Ca> Ba, Sr, barium and strontium complexes. square