Abstract
Chemical analysis of Al in high purity selenium was studied, whereby oxine-chloroform extraction method for determination of micro amounts of Al after the preliminary removing of interfering ions by diethyldithiocarbamate-chloroform extraction have been established.
Se is eliminated by evaporation, after decomposition of sample by nitric acid and sulfuric acid. The residue, treated with hydrofluoric acid, is dissolved in acetate-acetic acid buffer solution. To this solution, diethyldithiocarbamate is added and its complex is extracted away by chloroform. Then Al is extracted by chloroform solution of oxine and determined spectrophotometrically.
The method is sensitive and rapid. Provided that contamination from apparatus or reagents can be avoided, it is possible to determine Al down to a content of 0.1 ppm within about 3 hours.
