共沈-浮遊法による極微量銀の分離

概要

論文の詳細を見る
A new rapid method has been proposed for the concentration of microgram or submicrogram quantities of silver in acid solutions. A solution of p-dimethylaminobenzilidenerhodanine in ethanolic nitric acid is added to a smaple solution to give a small quantity of precipitate. The precipitate involving silver is then floated to the surface, by bubbling air into the solution through a disc of sintered glass after an addition of sodium n-dodecylbenzenesulfonate solutions. As little as 0.021 μg of silver is concentrated, with yields greater than 95%, from 100500 ml of 0.11 M nitric acid solution within 5 min. In case of 1 μg of silver and 0.5 g of copper in a solution, the concentration factor of silver with respect to copper is approximately 103. The method offers the following merits compared with the usual p-dimethylaminobenzilidenerhodanine coprecipitation method : rapidity, applicability to higher acidity, and a smaller quantity of the reagent required. It is successfully applied to the photometric determination of a few ppm of silver in high purity copper.
社団法人日本分析化学会の論文