Potentiometric study of the reduction of gold(III) with cobalt(II) in 1,10-phenanthroline or 2,2′-bipyridine medium: redox titration of gold(III) and its application to alloys
✍ Scribed by B.V. Rao
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 326 KB
- Volume
- 258
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A stmple potentmmetrlc method was developed for the direct determmation of gold, based on the redox tltratlon of goId with cobalt(U) m the presence of l,lO-phenanthrolme or 2,2'-blpyrldme The reductton of gold(III) to the metal and the oxldatton of cobalt(U) to the respecttve cobalt(II1) complexes proceeds raptdly m the pH range 4-6 at WC A mmunum of a tenfold molar amount of either of the complexmg agents IS necessary for the quantltattve reactlon Many common metal Ions do not mterfere The mterference due to A&) and Pd(I1) can be overcome but the presence of H&l), Fe(II1) and Pt(IV) mvahdates the determmatlon The method was successfully appbed to gold-contammg alloys