Assessment of the mobility of potentially toxic trace elements (PTEs) and radionuclides released in soils stabilized with mixtures of bentonite-lime-phosphogypsum.

Autor: Harrou A; Laboratory of Applied Chemistry and Environment, Faculty of Sciences, Mohammed First University, 60000, Oujda, Morocco., Ouahabi ME; UR. Art, Archéologie Et Patrimoine (AAP), Université de Liège, B-4000, Liège, Belgium.; Géochimie Et Environnement Sédimentaires (AGEs), Laboratoire Argiles, Département de Géologie, Université de Liège, B-4000, Liège, Belgium., Fagel N; Géochimie Et Environnement Sédimentaires (AGEs), Laboratoire Argiles, Département de Géologie, Université de Liège, B-4000, Liège, Belgium., Barba-Lobo A; Center On Natural Resources, Health and the Environment (RENSMA), University of Huelva, 21071, Huelva, Spain., Pérez-Moreno SM; Center On Natural Resources, Health and the Environment (RENSMA), University of Huelva, 21071, Huelva, Spain., Raya JPB; Center On Natural Resources, Health and the Environment (RENSMA), University of Huelva, 21071, Huelva, Spain., Gharibi E; Laboratory of Applied Chemistry and Environment, Faculty of Sciences, Mohammed First University, 60000, Oujda, Morocco. gharibi_elkhadir@yahoo.fr.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Aug; Vol. 31 (40), pp. 52917-52932. Date of Electronic Publication: 2024 Aug 21.
DOI: 10.1007/s11356-024-34694-9
Abstrakt: Phosphogypsum (PG) is a solid by-product of the phosphate industry, rich in contaminants and produced in large quantities. Raw materials and stabilized specimens, consisting of bentonite-lime-PG mixtures, were characterized by mineralogical, microstructural, chemical, alpha-particle, and gamma-ray spectrometry analysis before hydration and after hardening. Compressive strength and leaching tests were performed on hardened specimens. The physicochemical parameters and chemical composition of leachates from raw materials and hardened specimens were determined. PG contains high concentrations of natural radionuclides, specially from U series. Uranium-238 activities are double in PG than the worldwide average for soil values. The mobility of PTEs from PG is Cd (2.43%), Zn (2.36%), Ni (2.07%), Cu (1.04%), Pb (0.25%), and As (0.21%). Cadmium is the cation most easily released by PG in water with a concentration 0.0316 mg kg -1 . When PG is added to bentonite-lime mixture, cadmium is no longer released. The radionuclide 238,234 U and 210 Po predominates in the leachates of PG. However, the activity of 210 Po becomes negligible in the leachates of bentonite-lime-PG mixtures. The addition of PG to bentonite-lime mixtures facilitates the trapping of trace elements (PTEs) and radionuclides, providing potential applications for PG as road embankments and fill coatings.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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