Spectrophotometric determination of monomeric plus oligomeric and polymeric hydroxy species of chromium(III) in aqueous solutions

Abstract

The anion of edta formed complexes with monomeric and oligomeric species of chromium(III), whereas no reaction was observed with polymeric hydroxy forms in aqueous solutions of Cr(NO₃)₃ and CrCl₃. A procedure is described to distinguish monomeric plus oligomeric from polymeric forms of chromium(III) in aqueous solutions by determining the Cr^III-edta complex spectrophoto- metrically at 546 nm.