Effect of Co-pesticide on Adsorption- Desorption Process on Agricultural Soils
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2012, Vol 2, Issue 1
Abstract
This work aim is to study the effect of different co-pesticides as Atrazine and propanil on adsorption processes on agricultural soil samples. The co-pesticides as Atrazine on adsorption behavior of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide)] which is nonionic herbicide, and propanil on adsorption behavior of 2,4-D (2,4-dichlorophenoxyacetic acid) as anionic herbicide have been preformedusing batch equilibrium experiments on six agricultural soil samples. Linear and Freundlich models were used to describe the competitive sorption between the pair herbicides. Variation in adsorption affinities of the soils to the pesticides was observed. Freundlich coefficient KF values for adsorption process varied between 0.079 - 2.282 mlg-1and 0.058- 0.720 mlg-1for metolachlor/atrazine and 2, 4-D/propanilrespectively. The sorption strength of the herbicides decreased with increasing solution concentration. A nonionic surfactant was tested for its desorption potential and was found to be fairly effective at critical micelles concentration cmc concentration with removal of more than 65% sorbed pair competitive herbicides. Freundlich coefficient for desorption process KFdes for desorption process varied between 0.209- 0.523 and 0.926- 1.296 mlg-1 for metolachlor/atrazine and 2,4-D/propanil respectively. To investigate the effect of adsorption-desorption in the presence of cmc concentration of the nonionic surfactant for each pesticide alone also performed by using batch equilibrium experiments on six agricultural soil samples. The Freundlich coefficient KF in the presence of the nonionic surfactant for metolachlor and 2,4-Dranged between 0.337-0.437 and 0.001-1.012 mlg-1for adsorption processes. The Freundlich coefficient KFdesvalues for desorption process in presence of the nonionic surfactant ranged from 0.209 to 0.689 mlg-1and 0.238 to 1.442 mlg-1for metolachlor and 2,4-D respectively.
Authors and Affiliations
Rounak M. Shariff
Keywords
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