Spectrophotometric Determination of Bismuth in Copper and Cartridge Brass by the Iodide Method.
Abstract
An improved spectrophotometric method using iodide was developed for the determination of trace amounts of bismuth in copper and cartridge brass. In the method, the sample (25 g for copper and 10 g for cartridge brass) is dissolved in nitric acid and the bismuth is separated from the copper by an ammoniacal precipitation in the presence of ferric hydroxide as a gathering agent. The hydroxide precipitate is dissolved in hydrochloric acid, 2 ml of sulfuric acid is added, the solution is evaporated to a few ml, hydrobromic acid is added to volatilize the antimony and tin, and the solution is evaporated to fumes of sulfuric acid. The bismuth is then determined by the iodide color after adding a composite potassium iodide-sodium hypophosphite reagent. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA013827
Entities
People
- George Norwitz
- Michael Galan
Organizations
- Frankford Arsenal