Wydział Chemii

Tadeusz Paszko

Mirosława Chwil

Kamil Skic

Patrycja Boguta

Miłosz Huber

Joanna Matysiak

Maria Jerzykiewicz

2025

Science of The Total Environment

996

180474/1-180474/14

10.1016/j.scitotenv.2025.180474

Naukowa

Angielski

Artykuł

Fluopyram is a fungicide commonly applied in farming which has led to contamination of soils, crops, and surface water. However, adsorption and degradation processes of fluopyram in soils – crucial for understanding its environmental fate – have not been fully studied. The K_oc values obtained for six typical Polish soil profiles and three topsoils from northern and southern Europe, were in the range of 89.8–294.7 mL g⁻¹ for the topsoils and 110.0–2328.0 mL g⁻¹ for the subsoils. Microbial degradation of fluopyram in soils was combined with its time-dependent adsorption that was completed within 5–8 weeks. The half-life values estimated at 20 °C using the two-site nonequilibrium adsorption model coupled with the first-order degradation, and next corrected to the soil water contents at 10 kPa, were in the range of 207–887 d for the topsoils and 1007–4268 d for the subsoils. Neglecting the process of slow adsorption of fluopyram in soils led to large reduction of the calculated half-lives. The regression analysis indicated that its adsorption range and degradation rate can be predicted based on the soil physicochemical and microbiological properties. As follows from the simulations with FOCUS PELMO using the Hamburg scenario, annual application of fluopyram can cause contamination of groundwater and its concentration in the topsoil is much higher than that predicted previously. High concentration of fluopyram in the topsoil and its adsorption by fulvic acids denote a large risk of its transport into the surface water and its uptake by crops.

http://dx.doi.org/10.1016/j.scitotenv.2025.180474

http://www.elsevier.com