Abstract
A method for the spectrophotometric determination of 0.52.5% lithium in silver filler alloys with thorin was investigated.
The main metallic components and influencing metals were preliminarily removed by electrolysis of the sample solution in 0.4 N sulfuric acid using mercury cathode. This solution was transferred to a 100 ml measuring flask, its pH was adjusted to about 5.0 with potassium hydroxide solut, un, and then diluted to 100 ml. A 5 ml aliquot of this solution was taken into a 10 ml measuring flask, to which were added 0.5 ml of 20% potassium hydroxide solution and 1.0 ml of 0.2% thorin solution, and it was made up to 10 ml with water.
The absorbance at 456 mμ was measured against the reagent blank.
The results of recovery tests on synthetic samples were quite satisfactory.
