Khouni M. auteur aut IRD Grunberger Olivier auteur aut IRD Negro S. auteur aut IRD Hammecker Claude auteur aut IRD Chaabane H. auteur aut IRD text journalArticle eng text/pdf born digital access To evaluate the effects of salinity on the fate of pesticides in a Mediterranean irrigated system, experiments were carried out under laboratory conditions to determine the adsorption, desorption, and mineralization of chlorpyrifos (CPF) and metalaxyl-M (MET) in a soil sample from an irrigated field in northern Tunisia. Adsorption/desorption isotherms and mineralization kinetics data were obtained over a realistic range of salinities via batch equilibrium and incubation techniques. On the basis of the experimental results, MET has a lower sorption capacity than CPF does, and the adsorption data for both compounds were better fitted by the Freundlich equation, with Kf values of 0.477, 0.486, 0.426, 0.444 and 0.474 L kg-1 for MET and 38.994, 39.084, 40.644, 44.055 and 45.185 L kg-1 for CPF at salinities of 0, 1, 2, 5 and 10 g L-1, respectively. According to the mineralization experiments, increasing salinity increased the half-lives of both pesticides. For MET, the DT50 values in unsterilized soil were 206.68, 220.74, 222.16, and 238.73 days, and those in sterilized soil were 2772.58, 4077.33, 6301.33, and 8664.33 days at salinities of 0, 1, 2, 5, and 10 g L-1, respectively. For CPF, the DT50 values were 115.52, 138.62, 157.53, and 177.73 days in unsterilized soil and 346.57, 533.19, 693.14, and 990.21 days in sterilized soil. In terms of leaching behavior, the calculated groundwater ubiquity score (GUS) values for the MET and CPF indicate that the MET is classified as a leacher and that the CPF is classified as a nonleacher. specialized MEDITERRANEE TUNISIE 068PROSOL 076RAVPLA07 021ENVECO 31 54 63016-63032 2024 1614-7499 https://www.documentation.ird.fr/hor/fdi:010093053 10.1007/s11356-024-35411-2 1614-7499 [F B010093053] https://www.documentation.ird.fr/hor/fdi:010093053 https://www.documentation.ird.fr/intranet/publi/2025-02/010093053.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2025-02-10 2025-11-06 fdi:010093053 fre