Electrochemical oxidation

of methidathion organophosphorous pesticide

 

F. Hachami1, R. Salghi2, M. Errami2, L. Bazzi1, A. Hormatallah3, A. Chakir4, B. Hammouti5*

1 Laboratoire Environnement &  Matériaux, Faculté des Sciences,Université Ibn Zohr, B.P 8106 Agadir, Morocco

2Laboratoire d’Ingénieries des Procédés de l’Energie et  de l’Environnement,

Ecole Nationale des Sciences Appliquées, Agadir, Morocco

2Laboratoire des pesticides, Institut Agronomique et vétérinaire Hassan II Complexe Horticole d’Agadir, Morocco

4 GSMA,UMR CNRS 6089,  laboratoire de Chimie-Physique, Faculté des Sciences, Université de Reims,

UMR 6089, Moulin de la housse, BP 1039, FR-51687 Reims Cedex 2, France

5 Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences,

Université Mohammed Premier, B.P 717 Oujda, Morocco

* Corresponding author. E-mail: hammoutib@gmail.com

Received: 27 February 2009; revised version accepted: 20 July 2009

 

Abstract

     The aim of this study is to investigate the possibilities and ways of reducing the negative effects of pesticides on the environment. The obsolete methidathion organophosphorous pesticide stock is treated by electrolysis system. The results obtained show that the application of electrolysis in pesticide allows to reduce the Chemical Oxygen Demand (COD). For 2% NaCl and 3% NaCl the achieved reduction was 75 and 70%, respectively, while for 4% NaCl was 48%. In all cases, the pH of electrolysis was significantly reduced after 45 min. The COD of methidathion solution was observed to fall with pseudo first-order kinetics. An increasing of applied current leads an increase of the rate of electrochemical oxidation process. The effect of temperature shows that for 25 and 65°C the achieved reduction was 75 and 50%, respectively. The rate constant kI obtained exhibits a negative temperature coefficient which confirms that the electrochemical degradation proceeds via a complex mechanism

 

Keywords: Electrochemical oxidation; Obsolete pesticide; Methidathion; Environment; Kinetics.

 


 

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