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Dithionite as a Dissolving Reagent for Goethite in the Presence of Edta and Citrate. Application to Soil Analysis

Published online by Cambridge University Press:  28 February 2024

Elsa H. Rueda ,
María C. Ballesteros ,
Reynaldo L. Grassi  and
Miguel A. Blesa
Elsa H. Rueda
Affiliation:
Departamento de Química e Ingeniería Química, Universidad Nacional del Sur, Avenida Alem 1253, (8000) Bahía Blanca, Argentina
María C. Ballesteros
Affiliation:
Departamento de Química e Ingeniería Química, Universidad Nacional del Sur, Avenida Alem 1253, (8000) Bahía Blanca, Argentina
Reynaldo L. Grassi
Affiliation:
Departamento de Química e Ingeniería Química, Universidad Nacional del Sur, Avenida Alem 1253, (8000) Bahía Blanca, Argentina
Miguel A. Blesa
Affiliation:
Departamento Química de Reactores, Comisión Nacional de Energía Atómica, Avenida del Libertador 8250, (1429), Buenos Aires, Argentina
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Abstract

A synergistic effect of reductant and complexant is observed in the dissolution of goethite by dithionite and citrate or EDTA. The rate data are interpreted using the surface complexation approach to describe the interface of the reacting oxide. Adsorption of both S2O42− (D) and complexant (L) generates three surface complexes that define the dissolution behavior: ≡ Fe-D, ≡ Fe-L, and dimeric surface complexes. The initial rate increases at lower pH values because of increased surface complexation conditional formation constants. At pH values below 4, however, the fast decomposition of S2O42− gives rise to a rapid depletion of reductant, and total dissolution is not observed. It is shown that for best analytical results in soil analysis, EDTA is a better complexant than citrate; the iron extracted in one dithionite-EDTA treatment at pH 5–6, under N2 at 315 K is not increased by increasing the number of extractions, and is equivalent to the total extractable iron found by previous procedures.

Keywords

DithioniteGoethiteIron analysisIron dissolution
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 5 , October 1992 , pp. 575 - 585
Copyright
Copyright © 1992, The Clay Minerals Society

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