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Article Dans Une Revue Applied Geochemistry Année : 2002

Retention behaviour of humic substances onto mineral surfaces and consequences upon thorium (IV) mobility: case of iron oxides

Valérie Moulin
  • Fonction : Auteur
Florence Casanova
  • Fonction : Auteur
Christian Dautel
  • Fonction : Auteur

Résumé

The influence of humic acids (HA) on the retention of Th(IV) onto the surface of Fe oxides has been investigated. Thorium (IV) is here considered as an analogue of tetravalent radionuclides (Zr, Hf, U, Np, Pu). Hematite (–Fe2O3) and gœthite (–FeOOH) have been chosen as model phases because of their widespread presence in the earth's crust. Retention experiments were performed by batch procedure at constant ionic strength and varying pH in the range 2–10; the HA concentration varied in the range 1–100 mg l−1. Compared with the former data obtained on the retention of Th(IV) with the same hematite sample free of HA, the study of a ternary system (i.e. hematite–HA–Th), clearly shows the influence of HA on the retention mechanisms of Th(IV) even in neutral to slightly alkaline medium. In particular, it is illustrated that the retention of Th(IV) onto Fe oxides closely depends upon the ratio between humic and surface (Fe oxide) sites. This ratio has to be greater than a critical value in order to impede the sorption of Th(IV).

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Dates et versions

cea-00278075 , version 1 (08-05-2008)

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Citer

Pascal E. Reiller, Valérie Moulin, Florence Casanova, Christian Dautel. Retention behaviour of humic substances onto mineral surfaces and consequences upon thorium (IV) mobility: case of iron oxides. Applied Geochemistry, 2002, 17 (12), pp.1551-1562. ⟨10.1016/S0883-2927(02)00045-8⟩. ⟨cea-00278075⟩

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