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Electrochemical Studies of Adsorption of Paraquat onto Ca10(PO4)6(OH)2 from Aqueous Solution

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Author(s): Moulay Abderrahim EL MHAMMEDI | Abdelilah CHTAINI

Journal: Leonardo Journal of Sciences
ISSN 1583-0233

Volume: 7;
Issue: 12;
Start page: 25;
Date: 2008;
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Keywords: Paraquat | Apatite | Adsorption | Carbon paste electrode.

ABSTRACT
Paraquat is one of the most widely used herbicides in the world. It has had a tarnished reputation because of its acute oral toxicity and ill-health associated with operators - particularly in the plantation sectors of many developing countries. Paraquat binds rapidly and tightly to clay materials in soils, and when adsorbed it is biologically inactive. It also binds to humus and other organic material: this results in no, or very low soil residues or leaching into water sources. This article presents a studies of kinetic of adsorption onto hydroxyapatite phosphocalcique Ca10(PO4)6(OH)2 (HAP) from aqueous solution. Measurements are performed by electrochemical methods using the cyclic voltammetric, chronoamperometry and square wave voltammetry at carbon paste electrode (CPE).

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