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镀黑镍溶液,一般配方为(A)NiSO_4,ZnSO_4,NH_4CNS,H_3BO_5;(B)NiSO_4,ZnCl_2,NH_4CNS,H_3BO_3,有机添加剂等。在(A)溶液中测定NH_4NS,可以在酸性溶液中,以高价铁指示,用硝酸银滴定。但在(B)溶液中,因有Cl~-共存,不能用硝酸银滴定。本文用的方法是加一定量过量的硫酸铈标准溶液于试液中以氧化CNS~-,过量的铈盐以硫酸亚铁铵滴定,手续简便,结果较正确。一试剂硫酸铈溶液:0.1N,称取40.4克Ce(SO_4)_2·4H_2O加热溶解于500毫升2N硫酸中,冷却,稀至1升。硫酸亚铁铵溶液:0.1N,称取硫酸亚铁铵40克,
Black nickel plating solution, the general formula (A) NiSO_4, ZnSO_4, NH_4CNS, H_3BO_5; (B) NiSO_4, ZnCl_2, NH_4CNS, H_3BO_3, organic additives. Determination of NH4NS in solution (A) can be titrated with silver nitrate in an acidic solution, indicated by high-iron. But in (B) solution, due to Cl ~ - coexistence, can not be titrated with silver nitrate. In this paper, the method is to add a certain amount of excess cerium sulfate standard solution in the test solution to oxidize CNS ~ -, excessive cerium ammonium ferrous sulfate titration, the procedure is simple, the result is more correct. A reagent solution of cerium sulfate: 0.1N, weighed 40.4 g Ce (SO_4) _2 · 4H_2O dissolved in 500 ml of 2N sulfuric acid, cooled and diluted to 1 liter. Ferrous ammonium sulfate solution: 0.1N, weighed 40 grams of ammonium ferrous sulfate,