We describe the transfer mechanisms of pesticides in hygroscopic soils. The work consisted in using Henry’s constants of five pesticides to study the transfer mechanisms. The numerical work consisted to make a soil sample of height h with initial water content and initial pesticide concentration C₀ placing it in an ambient atmosphere where the temperature and relative humidity are controlled and assumed to be constants. The profiles of concentration as a function of the Henry’s constant of the pesticide for various initial water contents w₀ have been obtained. The results show that for an exposure time of 5 days 18 hours 53 minutes and 20 seconds, the maximum concentration profiles of the pesticide, compared to the initial concentration, represent 0.76% of C₀ for trifluralin, 6.4% of C₀ for endosulfan, 35.8% of C₀ for dichlorvos, 41.2% of C₀ for methylparathion and 78.2% of C₀ for alachlor. Concerned with those results, we can see that there is a significant increase in transfer mechanisms for high K_H and a significant decrease in transfers for low K_H. Those results plead in favor of an increased persistence of pesticides in hygroscopic soils because of their low K_H.

concentration profiles, Henry’s constant, hygroscopic soil, pesticides, transfer mechanisms.

Received: April 4, 2022; Accepted: May 14, 2022; Published: May 31, 2022

How to cite this article: Samuel Ouoba, Auguste Aristide Soré, Abdoulaye Kaboré and Jean Koulidiati, Numerical study of the effect of Henry’s constant on the mechanisms of pesticides transfer in the superficial layers of hygroscopic soils, JP Journal of Heat and Mass Transfer 27 (2022), 133-145. http://dx.doi.org/10.17654/0973576322028

This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License

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