THE USEFULNESS OF MÖSSBAUER SPECTROSCOPY

FOR THE STUDY OF IRON OXIDATION STATE IN POND SEDIMENTS

J. El Moata1*, A. El Ghmari1, M. Sajieddine2, M. Abdelmoula3,

M. Droussi4, H. Latrache1, E. Agouriane2, A. El Bouadili1

1 Laboratoire de Télédétection et des SIG Appliqués aux Géosciences et Environnement,

Faculté des Sciences et Techniques, B.P. 523, Béni-Mellal, Morocco

2 Laboratoire de Physique des Matériaux, Faculté des Sciences et Techniques, B.P. 523, Béni MellaL, Morocco

3L.C.P.M.E, UHP, Nancy-I, 405 rue Vandoeuvre, F-54600 Villers-lès-Nancy, France

4 Centre National d’Hydrobiologie et de Pisciculture, Station de Carpiculture de la Deroua, Béni Mellal, Morocco

* Corresponding author. E-mail : elmoata@imel.org

Received : 16 January 2004; revised version accepted :08 June 2004

Abstract

The present study aimed to use Mössbauer spectroscopy to investigate the speciation of Fe in aquaculture pond sediments collected from the Deroua fisheries station (Morocco). The envelop of sediment layers Mössbauer spectra shows peaks that lie from -8.5 mm/s to 8.5 mm/s. In all layers spectra A, B and C, the fittings were obtained considering two sextuplets (S1 and S2) and two doublets (D1 and D2). Mössbauer Parameters analysis indicates that D1 and D2 are respectively attributed to structural Fe3+ and Fe2+ while S1 and S2 are attributed respectively to Hematite a -Fe2O3 and Goethite a -FeOOH. The relative proportion of Fe3+ species decreases from 95% in the original soil to 78% in the shallow layer. Concentrations of Fe2+ species are greater in A layer (23%) than in the original soil (5%) and in the medium horizon (8%).

Keywords : Mössbauer spectroscopy; Iron; Pisciculture; Pond Sediment; O-phenanthroline.

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