光電比濁法によるスズ,鉛地金およびホワイトメタル中のヒ素の定量法

概要

論文の詳細を見る
A simple and rapid method has been established. for the determination of 0.001 to about 0.3% of arsenic in the above metals. On tin base metals, 0.25 to 1 g sample is decomposed by treating with a mixture of 10 ml hydrochloric acid and 2 ml hydrogen peroxide (30%). In the case of lead base metals, samples are decomposed by treating with nitric acid, then the bulk of lead is separated as lead sulfate by adding sulfuric acid. After being concentrated to about 5 ml, 15 ml of the mixed reducing agent solution (50 g of sodium hypophosphite is mixed with 500 ml of hydrochloric acid, the sodium chloride formed is filtered off, thereafter, 50 g of stannous chloride and about 2 g of tin metal are added), 3 ml of potassium iodide solution (20% w/v) and 2 ml of arabic glue solution (5% w/v) are added successively. The turbidity of the solution is measured using a 440 mμ filter. It required 10 minutes for the analysis of tin base samples and 30 minutes for lead base samples.
社団法人日本分析化学会の論文