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Investigation of the reactivity of propanil using cyclic voltammetric methods

Authors:

Ayanthi Navaratne ,

Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
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Namal Priyantha,

Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
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Udaya Rodrigo

Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
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Abstract

The stability and hence the reactivity of the herbicide, propanil [N-(3,4-dichlorophenyl) propionamide], strongly depends on pH of the medium and freshness of the solution. According to cyclic voltammetric investigation, propanil is fairly stable in mixed water/ethanol medium between pH = 4 and pH = 7 for a period of ten weeks. However, in strongly acidic medium (pH = 1), its degradation which results in 3,4- dichloroaniline (3,4-DCA) follows first order kinetics with an apparent rate constant of 5.33×10-8 s-1, while in strongly basic medium (pH =13), it undergoes faster degradation. 3,4-DCA is electroactive and its fresh solutions mimic the behaviour of propanil after degradation. Adsorption characteristics of propanil are also pH dependent, and its main degraded product, 3,4-DCA, is irreversibly adsorbed onto glassy carbon surfaces in an extremely basic medium.

Keywords: Degradation, electrochemical, pesticides, propanil, reactivity, 3,4-dichloroaniline  

doi:10.4038/jnsfsr.v36i3.155  

Journal of the National Science Foundation of Sri Lanka 36 (3) 199-203

How to Cite: Navaratne, A., Priyantha, N. and Rodrigo, U., 2008. Investigation of the reactivity of propanil using cyclic voltammetric methods. Journal of the National Science Foundation of Sri Lanka, 36(3), pp.199–203. DOI: http://doi.org/10.4038/jnsfsr.v36i3.155
Published on 29 Sep 2008.
Peer Reviewed

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