Orbital - Vol. 1 No. 1 - January-March 2009
FULL PAPERS

Vertical migration of some herbicides through undisturbed and homogenized soil columns

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  • Md. Wasim Aktar,
  • Dwaipayan Sengupta,
  • Swarnali Purkait,
  • Ashim Chowdhury
Md. Wasim Aktar
Pesticide Residue Laboratory, Department of Agricultural Chemicals
Dwaipayan Sengupta
Department of Agricultural Chemistry and Soil Science, Institute of Agricultural Science, University of Calcutta
Swarnali Purkait
Department of Agricultural Chemistry and Soil Science, Institute of Agricultural Science, University of Calcutta
Ashim Chowdhury
Department of Agricultural Chemistry and Soil Science, Institute of Agricultural Science, University of Calcutta
Published December 29, 2008
Keywords
  • leachability, soil columns, thiocarbamate, dinitroaniline, herbicides, GLC and HPLC analysis
How to Cite
(1)
Aktar, M. W.; Sengupta, D.; Purkait, S.; Chowdhury, A. Vertical Migration of Some Herbicides through Undisturbed and Homogenized Soil Columns. Orbital: Electron. J. Chem. 2008, 1, 17-25.

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Abstract

A laboratory experiment was conducted by using three herbicides, two from dinitroaniline group and one from thiocarbamate group to know their degree of downward movement (leachability) through soil columns and their contribution in ground water contamination. Soil columns were loaded with Pendimethalin, Benthiocarb and Oryzalin @ 10.0, 10.0 and 7.7 kg a.i. ha-1, respectively. After 30 days soil samples were analyzed from each segments (i.e. 0-6, 6-12, 12-18, and 18-24 and 24-30 cm) for Benthiocarb and Pendimethalin by GLC equipped with Ni63 electron capture detector (ECD) and for Oryzalin by HPLC coupled with UV-VIS detector. The results obtained in the present study reveal that the residues of the three herbicides under investigation were predominantly confined to the upper soil layer (0-6 cm). Comparatively, low mobility of these herbicides in soils could be due to strong adsorption of these chemical to soil colloids.

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