RT Journal Article
T1 Spatiotemporal evolution of U and Th isotopes in a mine effluent highly polluted by Acid Mine Drainage (AMD)
A1 Guerrero Márquez, José Luis
A1 Suárez Vaz, Nuria
A1 Paz Gómez, Daniela Carolina
A1 Pérez Moreno, Silvia María
A1 Bolívar Raya, Juan Pedro
AB The spatiotemporal evolution of both U and Th isotopes in a mine effluent highly polluted by acid mine drainage(AMD) was evaluated. The acidic tributary, which born from the outflows of an abandoned sulfide mine, flowsinto the Odiel River. AMD comprises an important source of natural radionuclides, presenting concentrations of238U and 232Th, two and four orders of magnitude higher, respectively, than the background values of surfacecontinental waters. These natural radionuclides behave conservatively along the mine effluent (pH < 2.5)throughout the hydrological year. Under AMD conditions uranium is in the hexavalent state U(VI) and the maindissolved species are uranyl sulfate complexes. The polluted tributary has a significant impact on the Odiel Riveracidifying its waters during the low flow season and increasing up to one order of magnitude the activity concentrationsof U and Th isotopes. U presented a conservative behavior in the Odiel River during the low flowseason (pH ≈ 3), however it is removed from the liquid phase in the wet season (pH ≈ 6), probably due itscoprecipitation/adsorption onto Al-phases. Th shows a high sensitivity to small increases of pH, and it is stronglycoprecipitated/adsorbed with or onto Fe-oxyhydroxydizes in the river.
PB Elsevier
SN 0304-3894
SN 1873-3336 (electrónico)
YR 2023
FD 2023
LK https://hdl.handle.net/10272/22246
UL https://hdl.handle.net/10272/22246
LA eng
NO Guerrero, J. L., Suárez-Vaz, N., Paz-Gómez, D. C., Pérez-Moreno, S. M., & Bolívar, J. P. (2023). Spatiotemporal evolution of U and Th isotopes in a mine effluent highly polluted by Acid Mine Drainage (AMD). In Journal of Hazardous Materials (Vol. 447, p. 130782). Elsevier BV. https://doi.org/10.1016/j.jhazmat.2023.130782
NO This research was funded by the University of Huelva and theOperative FEDER Program-Andalucía 2014–2020 (UHU-1255876,UHU-202020); The European Regional Development Fund through theAgencia Estatal de Investigaci´on (research grant PID2020–116461RBC21and 116461RA-C22), and the Andalusian government (I+D+i-JAPAIDI-Retos project PY20_00096). Jos´e Luis Guerrero thank theSpanish Ministry of Universities for the Margarita Salas research grant.Funding for open access charge: Universidad de Huelva / CBUA.
DS Repositorio Institucional de la Universidad de Huelva
RD 28 may 2026