Spectrophotometric determination of cobalt by extraction of benzyltributylammonium tetrathiocyanatocobaltate(II)

摘要

Cobalt (0-120 mu g) can be determined spectrophotometric ally at 625 nm after its extraction as benzyltributyl ammonium tetrathiocyanatocobaltate(II) into chloroform at pH 7. The effects of pH, diverse ions and masking studies are reported. The method has been applied to the determination of cobalt (0.2-10.0%, w/w) in high speed tool steels without prior separation of iron, and in vitamin B12. (C) 1997 Elsevier Science B.V.