Galík A, Knízek M
Lachema Kaznejov, Pizen-North, Czechoslovakia.
Talanta. 1966 Aug;13(8):1169-75. doi: 10.1016/0039-9140(66)80165-0.
A procedure for the simultaneous determination of silver and copper in high-purity lead is given. After dissolution of the sample the majority of the lead is removed by precipitation with ammonium sulphate. Silver and copper are then determined by spectrophotometric extractive titration at pH 4.3-5.5 with dithizone. Changes of absorbance are measured at 550 mmu. The procedure has been checked by the method of standard additions and by comparison with conventional methods. The procedure is highly selective. The limit of determination is 2.5 x 10(-5)% of silver and 1.1 x 10(-5)% of copper.
给出了一种同时测定高纯铅中银和铜的方法。样品溶解后，大部分铅通过硫酸铵沉淀除去。然后在pH 4.3 - 5.5条件下，用双硫腙通过分光光度萃取滴定法测定银和铜。在550毫微米处测量吸光度变化。该方法已通过标准加入法并与传统方法进行比较进行了检验。该方法具有高度选择性。银的测定限为2.5×10⁻⁵%，铜的测定限为1.1×10⁻⁵%。
