title: Analysis of chromium(III)-fluoride-complexes by ion chromatography.
abstract: A method for the ion chromatographic separation of cationic CrF(x)-species in aqueous acidic solutions with photometric detection is described. CrF(3)-, CrF(+)(2)- and CrF(2+)-species can be separated on a commercial cation-exchange column using HCl/2,3-diaminopropionic acid (DAP) as eluent. The chromium(III)-complexes are converted with 2,6- pyridinedicarboxylic acid (PDCA) into the violet [Cr(PDCA)(2)](-)-complex at temperatures >90 degrees C by post-column derivatisation for the subsequent spectrophotometric detection at lambda=335 nm. Iron- and nickel-ions do not disturb the determination even in concentrations higher than those of the chromium (III)-ions.
authors.affiliation: Institute for Materials, Department of Electrochemistry and Galvanotechnique, Technical University Ilmenau, PSF 0565, D-98684, Ilmenau, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Ehrling
authors.forename: U
authors.initials: U
authors.lastname: Schmidt
authors.forename: H
authors.initials: H
authors.lastname: Liebscher