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Physicochemical characterization of edible clays and release of trace elements

Abstract : The mineralogical composition of seven edible clays from West Africa (Ivory Coast, Guinea and Senegal) was determined by X-ray diffraction, thermal (DTA, TGA and DSC) and chemical (ICP-MS and ICP-OES) analyses and measurement of specific surface areas and density. The major compounds were kaolinite, illite, muscovite, quartz and feldspars. Electrochemical analysis of clay suspensions by voltamperometry (SnO2:F) yielded no results at 6.5 < pH < 7 and pH ≈ 8.3. However, ionic species transfer was revealed at pH ≈ 1.8 by an anodic peak. The analysis by X-ray diffraction of the metal cation layers which were deposited on the blades (SnO2:F), showed the presence of mineral elements having therapeutic implications such as Fe and Zn.
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https://hal-unilim.archives-ouvertes.fr/hal-00630545
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Soumis le : lundi 10 octobre 2011 - 13:07:54
Dernière modification le : mercredi 16 septembre 2020 - 17:23:14

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Odilon Kikouama, Léon Konan Koffi, A. Katty, Jean-Pierre Bonnet. Physicochemical characterization of edible clays and release of trace elements. Applied Clay Science, Elsevier, 2009, 43 (1), pp.135-141. ⟨10.1016/j.clay.2008.07.031⟩. ⟨hal-00630545⟩

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