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在酸性介质中 ,Fe3+ 与磺基水杨酸络合物的吸收峰在 51 0nm处 ,在此波长处大量Ni2 + 的吸收最弱 ,而Ni2 + 在 72 0nm处出现吸收峰 ,此处铁的络合物的吸收亦很弱 ,据此建立了题示样品中铁和镍的光度分析方法。铁和镍的相互干扰可用数学计算法加以消除 ,其它共存离子不干扰测定。测定造币镀液及其废液样品中铁和镍的相对标准偏差 (n =5)分别 <2 .5%和<1 .8% ,加标回收率分别为 97.0 %～ 1 0 2 .1 %和 97.4 %～ 1 0 1 .6%。
In acidic medium, the absorption peak of Fe3 + complex with sulfosalicylic acid is at 510 nm, the absorption of a large amount of Ni2 + is the weakest at this wavelength, while the absorption peak of Ni2 + appears at 720 nm, The absorption of the complex was also very weak. Thus, a spectrophotometric method for the determination of iron and nickel in the sample was established. The mutual interference of iron and nickel can be eliminated by mathematical calculation. Other coexisting ions do not interfere with the determination. The relative standard deviations (n = 5) of iron and nickel in coinage plating solution and its waste liquor samples were respectively <2.5% and <1.8%, and the recoveries were 97.0% ~ 102.1% And 97.4% ~ 1 0 1 .6%.