Preconcentration and separation of Cr(III) and Cr(VI) from aqueous solutions by complex formation-ion exchange

C. Sarzanini, E. Marengo, M. C. Gennaro, C. Baiocchi, E. Mentasti

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

A preconcentration and separation procedure for Cr(III) and Cr(VI) has been developed. 1,2-di-hydroxybenzene-3,5-disulphonic acid (Tiron) is an effective chelating agent for Cr(III) and, in addition, allows the adsorption of the resulting complex on anion-exchange resin through the interaction of the -SO 3 - groups which are not involved in the coordination act. The elution of aqueous samples containing mixtures of Cr(III) and Cr(VI) through an anion-exchange resin (pH 5) will result in the adsorption of Cr(VI). The recovered solution is then treated with Tiron and brought to pH 9. Elution will produce the adsorption of Cr(III) in the form of its Tiron complex. After fixation, the adsorbed species are eluted with the appropriate reagent (HClO 4 solution for Cr(III) and NH 4Cl solution, brought to pH 8, for Cr(VI)). According to the described procedures, solutions of the two analytes at ppb levels, were concentrated by a factor of 10 2, as tested by AAS, with yields of 104 ±9 and 94 ±8, respectively for Cr(III) and Cr(VI).

Lingua originaleInglese
pagine (da-a)381-385
Numero di pagine5
RivistaStudies in Environmental Science
Volume23
Numero di pubblicazioneC
DOI
Stato di pubblicazionePubblicato - 1984
Pubblicato esternamente

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