Research Articles
Investigation of the reactivity of propanil using cyclic voltammetric methods
Authors:
Ayanthi Navaratne ,
Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
Namal Priyantha,
Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
Udaya Rodrigo
Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya., LK
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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