Determination of stability constants of metal-azo dyes complexes by ion-exchange and spectrophotometry

Ornella Abollino, Mauriziu Aceto, Maria Concetta Bruzzoniti, Edoardo Mentasti, Corrado Sarzanini

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The stability constants of the complexes of Al, Cu, Fe, Ni with two sulphonated azo-ligands, namely Calcichrome and SPADNS, were determined with three different procedures. One procedure is based on ion exchange and involves the retention of the negatively charged complexes onto an anion exchange resin and the determination of free and complexed metal. The other two techniques are based on the different UV-visible absorbances of free ligand and complex: the first one provides a value for the conditional stability constants, which in turn allows the calculation of the apparent and thermodynamic constants; the second procedure is a graphic method of extrapolation and directly provides the value of the apparent stability constants.

Lingua originaleInglese
pagine (da-a)119-128
Numero di pagine10
RivistaAnnali di Chimica
Volume89
Numero di pubblicazione1-2
Stato di pubblicazionePubblicato - gen 1999
Pubblicato esternamente

Fingerprint

Entra nei temi di ricerca di 'Determination of stability constants of metal-azo dyes complexes by ion-exchange and spectrophotometry'. Insieme formano una fingerprint unica.

Cita questo