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Research Journal of Environmental Sciences
  Year: 2011 | Volume: 5 | Issue: 3 | Page No.: 221-235
DOI: 10.3923/rjes.2011.221.235
Behavior of Atrazine and Malathion Pesticides in Soil: Simulation of Transport Process using Numerical and Analytical Models
G. Abdel- Nasser, A.M. Al- Turki, M.I. Al- Wabel and M.H. El- Saeid

Abstract:
The objectives of present study were to investigate the transport and distribution of Atrazine and Malathion in soil columns and to determine the transport parameters by using numerical and analytical models. The soil sample used in the study was collected from the surface layer (0-30 cm) of Kharj Province, Riyadh, Saudi Arabia. The soil has a sandy loam texture. Atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine) as herbicide and Malathion (diethyl (dimethoxy thiophosphorylthio) succinate) as insecticide was used as tested pesticides. The PVC columns, 30.0 cm long and 6.0 cm ID with closed bottoms were used. The columns were hand-packed with air dried sandy loam soil to the desired bulk density. Atrazine and Malathion sorption isotherms were done according to the recommended method to determine the sorption characteristics. Water was added to the soil surface at constant water flow rate (0.182 and 0.282 cm min-1). Atrazine or Malathion was applied with concentration of 300 μg L-1 with a pulse period of 60 min. and then water flow lasted to 360 min with constant water flux, respectively. Pesticide residues in soil or solution were extracted with acetone: hexane, 3:2 extracting solution using Microwave-Assisted Extraction Technique (MAE) and determined with GC-MS. The water flow and pesticides transport equations were solved numerically using the HYDRUS-2D and analytically with CXTFIT code. The present results showed that Atrazine was reached the lower boundary at only the high rate of water flux, but the low water flux did not drained from lower boundary. Both low and high water flux are able to move Malathion to the lower boundary with different magnitude. High and low water flux led to leach Atrazine downward and the maximum concentration was at 17.5 and 12.5 cm depth. In case of Malathion, the water flux leached Malathion out of soil column with high rate, while low rate led to concentrate the Malathion at lower depth of soil column. Numerical and analytical analysis did not differ from experimental data. Thus, the HYDRUS-2D and CXTFIT models successfully predicted Atrazine and Malathion distribution profiles under the present conditions.
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How to cite this article:

G. Abdel- Nasser, A.M. Al- Turki, M.I. Al- Wabel and M.H. El- Saeid, 2011. Behavior of Atrazine and Malathion Pesticides in Soil: Simulation of Transport Process using Numerical and Analytical Models. Research Journal of Environmental Sciences, 5: 221-235.

DOI: 10.3923/rjes.2011.221.235

URL: https://scialert.net/abstract/?doi=rjes.2011.221.235

 
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