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为了获得良好的镀层,镀镍液中硫酸镍(NiSO_4.7H_2O)的含量,一般控制在150～180g/l之间(也有控制在200～250g/l)。本文利用加入适量氨水后,使镍与氨离子生成蓝色的氨合络离子,借此生成的颜色进行比色测定,方法简便快速,又可节省试剂,经合成试液试验,9次测定的相对标准偏差平均不大于1.5％,回收率为91～120％。对试剂用量及共存离子的影响进行了实验,50％柠檬酸铵加入量为1.0～9.0ml;氨水(1+1)加入量1.5～8.0ml,所得的吸光度一致,在50ml显色液中,下列含量金属离子的存在,不影响60mg镍的比色测定:Fe(Ⅲ)(5.0)、Mg(Ⅱ)(3.0)、Cu(Ⅱ)(0.2)、Ca(Ⅱ)
In order to obtain a good coating, the content of nickel sulfate (NiSO 4 4.7H 2 O) in the nickel plating solution is generally controlled between 150 and 180 g / l (also controlled at 200 to 250 g / l). In this paper, by adding an appropriate amount of ammonia, the nickel and ammonia ions to generate blue ammonia complex ion, the resulting color for colorimetric determination, the method is simple and fast, but also save the reagent, the synthetic test solution, measured 9 times The relative standard deviations average not more than 1.5%, the recovery rate was 91 ~ 120%. The amount of reagents and the effect of coexisting ions were tested, the amount of 50% ammonium citrate was 1.0 ~ 9.0ml; ammonia (1 + 1) was added 1.5 ~ 8.0ml, the absorbance was the same, The following content of metal ions does not affect the colorimetric determination of 60mg nickel: Fe (Ⅲ) (5.0), Mg (Ⅱ) (3.0), Cu (Ⅱ)