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Influence of time, pH, temperature, organic matter and exchangeable cations on the adsorption of oxamyl on illites and kaolinites

Published online by Cambridge University Press:  27 March 2009

O. P. Bansal  and
Vijay Bansal
O. P. Bansal
Affiliation:
Chemical Laboratories, Dharma Samaj College, Aligarh-202001, India
Vijay Bansal
Affiliation:
Chemical Laboratories, Dharma Samaj College, Aligarh-202001, India
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Summary

The adsorption of oxamyl under various conditions of time, pH, temperature, organic matter and exchangeable cations on illites and kaolinites was examined. The first order reaction indicated diffusion-controlled adsorption, maximum adsorption occurring at pH 6–5 which is near the pK value of oxamyl. Exchangeable cation in the order Na > H > Ca, organic matterand increasing temperature decreased adsorption. Adsorption isotherms and the molecular structure of oxamyl point to a reaction mechanism for oxamyl association with acid- and base-saturatedclays which involve either protonation or co-ordination of exchangeable clay cations to the carbonyl of the amide structure.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 94 , Issue 3 , June 1980 , pp. 557 - 563
Copyright
Copyright © Cambridge University Press 1980

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