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Modeling of Sorption and Biodegradation of Parathion and Its Metabolite Paraoxon in Soil

K. Saffih-Hdadi*,a, L. Brucklera and E. Barriusob

a Site Agroparc, Institut National de la Recherche Agronomique, CSE-sol, 84914 Avignon cedex 09, France
b Institut National Agronomique de Paris-Grignon, EGC-sol, BP 01, 78850 Thiverval-Grignon, France



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  		Fig. 1. Structural formulae of chemicals used in sorption and degradation studies.

 


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  		Fig. 2. Schematic representation of the model (S for the pesticide and M for the metabolite).

 


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  		Fig. 3. Sorbed parathion and paraoxon vs. time. Error bars are also presented but not always visible when they are small.

 


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  		Fig. 4. (a) Cumulative rate of total 14CO2 released from sterilized soil samples (quantities are expressed as percentages of the initial applied radioactivity). (b) Cumulative rate of total 14CO2 released from nonsterilized soil samples (quantities are expressed as percentages of the initial applied radioactivity).

 


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  		Fig. 5. Mass balances for parathion (a) and paraoxon (b) vs. time (quantities are expressed as percentages of initial applied radioactivity).

 


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  		Fig. 6. Kinetics of appearance and disappearance of (a) parathion, (b) paraoxon, and their degradation products.

 


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  		Fig. 7. Measured (symbols) and predicted (continuous lines) kinetics for paraoxon. Experimental points located on the concentration axis correspond to observations made at t = 0 and 0.083 d.

 


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  		Fig. 8. (a) Measured (symbols) and predicted (continuous lines) kinetics for parathion. Experimental points located on the concentration axis correspond to observations made at t = 0 and 0.083 d. (b) Predicted kinetics for metabolite of parathion.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2003 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.