THIN-LAYER CHROMATOGRAPHY OF MIXED-LIGAND ZINC-COMPLEXES COUPLED WITHATOMIC-ABSORPTION SPECTROMETRIC ANALYSIS OF ZINC

Off-line coupling of two analytical methods: thin-layer chromatography (TLC) and atomic absorption spectrometry (AAS) was investigated for p reliminary stability studies of zinc carboxylato complexes bound to ni cotinic acid and their chromatographic separation on a Silufol layer. Zinc content, determined by an AAS method in fractions scrapped off th e layers after zinc carboxylato complex (ZC) chromatographic analyses responds to ZC dissociation during chromatographic process. It was fou nd that solute chromatographic stability is influenced substantially b y the concentration of organic modifier in the eluent. To reveal relat ions between zinc distribution, corresponding solute retention and com plex stability was the main aim of the presented paper. (C) 1998 Publi shed by Elsevier Science B.V. All rights reserved.