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Evaluation des potentialités de lessivage de la terbuthylazine et de l'atrazine dans trois sols de la région Centre

Abstract : The objective of this work was to compare the mobility of atrazine and terbuthylazine in three soils : a loamy clay soit, a calcareous clay soit and a high clay soit in order to estimate the risks of contamination of the groundwater. The batch adsorption/desorption studies were conducted in the laboratory. The three soils had more affinity for terbuthylazine than for atrazine. No simple relation was observed between adsorption and clay content. It has been shown that in addition to the organic content, the nature of the organic matter played an important role in the adsorption, with the most humified organic matter having the highest affinity for the two triazines. Laboratory incubation experiments, under controlled conditions showed a faster biodegradation of atrazine than of terbuthylazine, and a more important linon extractable" residue formation with terbuthylazine (38%) th an atrazine (22%). In experiments in laboratory soit columns, we appreciated the potentialleaching of the two triazines in relation with the characteristics of the three soHs. The transport of atrazine is greater than of terbuthylazine. Furthermore the leaching of the two triazines was more intense in the loamy clay soil th an in the two others. In opposite with these laboratory models, we set up outdoor Iysimeters, in order to study under natural conditions the different behaviours of atrazine in the three soits. The persistence of atrazine under outdoor conditions was 2 to 3 times greater th an that estimated in the laboratory. Moreover the results obtained with Iysimeters indicated a more important migration of the triazine-residues in the calcareous clay soit than in the two others. The percolated radioactivity was more important in the calcareous clay soil (3,3%), compared to the high clay soil (1,1 %), and the loamy clay soit (0,9%). Abstract
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Contributor : Sylvie DOUSSET Connect in order to contact the contributor
Submitted on : Thursday, February 9, 2017 - 5:27:51 PM
Last modification on : Tuesday, May 10, 2022 - 3:38:03 PM
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  • HAL Id : tel-01463857, version 1


Sylvie Dousset. Evaluation des potentialités de lessivage de la terbuthylazine et de l'atrazine dans trois sols de la région Centre. Ingénierie de l'environnement. Institut National Polytechnique de Lorraine (INPL); Ecole Nationale Supérieure d'Agronomie et des Industries Alimentaires, 1994. Français. ⟨NNT : 1994INPL036N⟩. ⟨tel-01463857⟩



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