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Assessment of hydrological, geological, and biological parameters of a river basin impacted by old Hg mining in NW Spain.
Escudero, Lucía; Ojanguren, Alfredo F; Álvarez, Rodrigo; García, Carmen; Pañeda, Jose; Alberquilla, Fernando; Ordóñez, Almudena.
Afiliación
  • Escudero L; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain.
  • Ojanguren AF; Department Biology of Organisms and Systems, University of Oviedo, Asturias, Spain.
  • Álvarez R; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain.
  • García C; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain.
  • Pañeda J; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain.
  • Alberquilla F; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain.
  • Ordóñez A; Department Exploitation and Prospecting of Mines, University of Oviedo, Asturias, Spain. aoalonso@uniovi.es.
Environ Sci Pollut Res Int ; 31(7): 11081-11095, 2024 Feb.
Article en En | MEDLINE | ID: mdl-38217815
ABSTRACT
Mercury (Hg) is a toxic metal that can cause adverse effects for the health of ecosystems. The Caudal River is one of the main rivers in the Asturias region (NW Spain), whose basin is highly anthropized, hosting several Hg mines, closed in the last century. Arsenic (As) is also found in the mineral paragenesis of the Hg deposits, posing a greater environmental risk. In the mining sites, remaining old facilities and tailings continue to release these elements into the environment. In this work, samples of fluvial sediments and water were taken, both in areas affected by anthropic activity and in pristine areas, in order to establish the background levels for the critical elements. The mineralogical study of the sediments, combined with EDS microanalysis, is useful to identify mineralogical traps such as Fe oxides or clays to retain the As. The As content in all sampled sediments is above the threshold effect levels (TEL), the possible effect range within which adverse effects occasionally occur, according to the Canadian Sediment Quality Guidelines for the Protection of Aquatic Life. This fact is related to a naturally high geochemical background in the basin, due to the existing mineral deposits. The PEL threshold (the probable effect range within which adverse effects frequently occur) is exceeded by more than an order of magnitude in the sediments downstream of the Hg mines. In these points, the As content in the water, exceeding 700 µg L-1 As, is also above the quality standard established in Spanish legislation. As a result, the Caudal River tributaries in the lower part of the basin do not reach a good ecological state, according to the Hydrological Planning Office, and in some cases their state is deficient, showing low richness and high dominance of macroinvertebrates. Although the concentrations decrease with distance from the source, these findings justify the low ecological quality of the affected watercourses.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arsénico / Contaminantes Químicos del Agua / Mercurio Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte / Europa Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Arsénico / Contaminantes Químicos del Agua / Mercurio Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte / Europa Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Alemania