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CONTRIBUTIONS TO THE STUDY OF CLAY MINERALS SEPARATION FROM SOILS BY PLANE ELECTROPHORESIS

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Author(s): Dumitru Bulgariu | Constantin Rusu | O. G. Iancu | Iuliana Breaban | Laura Bulgariu

Journal: Soil Forming Factors and Processes from the Temperate Zone
ISSN 1582-4616

Volume: 5;
Issue: 1;
Start page: 49;
Date: 2006;
Original page

Keywords: plane electrophoresys | clay minerals

ABSTRACT
The preliminary results from this study are referring to the separation of kaolinite and mortmorillonite from clay fraction (< 2 μ) from a Dystric Cambosol sample. As electrolytes were used 0.01 M Na2HPO4 and KCl solutions. The separation of kaolinite and mormorillonite can be done, with acceptable results, using work tensions between 130÷150 V, a 20÷30 minutes migration time, by the dispersion of solid material in electrolyte solutions with concentrations between 0.01÷0.05 M. The mortmorillonite can be separated at acceptable parameters, both from dispersion in KCl and in Na2PO4. An acceptable separation of kaolinite takes place only from dispersions in KCl. At kalolinite and mortmorillonite separation, the interferences are determined by the humus acids, iron, aluminium or manganese oxides and oxyhydroxides. These interferences are manifested even at low contents (< 1 %) in work samples.
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