Ecotoxicological risks of the abandoned F-Ba-Pb-Zn mining area of Osor (Spain).
Due to its potential toxic properties, metal mobilization is of major concern in areas surrounding Pb-Zn mines. In the present study, metal contents and toxicity of soils, aqueous extracts from soils and mine drainage waters from an abandoned F-Ba-Pb-Zn mining area in Osor (Girona, NE Spain) were evaluated through chemical extractions and ecotoxicity bioassays. Toxicity assessment in the terrestrial compartment included lethal and sublethal endpoints on earthworms Eisenia fetida, arthropods Folsomia candida and several plant species, whereas aquatic tests involved bacteria Vibrio fischeri, microalgae Raphidocelis subcapitata and crustaceans Daphnia magna. Total concentrations of Ba (250-5110 mg kg-1), Pb (940 to >5000 mg kg-1) and Zn (2370-11,300 mg kg-1) in soils exceeded intervention values to protect human health. Risks for the aquatic compartment were identified in the release of drainage waters and in the potential leaching and runoff of metals from contaminated soils, with Cd (1.98-9.15 µg L-1), Pb (2.11-326 µg L-1) and Zn (280-2900 µg L-1) concentrations in filtered water samples surpassing US EPA Water Quality Criteria (2016a, b). Terrestrial ecotoxicity tests were in accordance with metal quantifications and identified the most polluted soil as the most toxic. Avoidance and reproduction tests with earthworms showed the highest sensitivity to metal contamination. Aquatic bioassays performed in aqueous extracts from soils confirmed the results from terrestrial tests and also detected toxic effects caused by the mine drainage waters. Algal growth inhibition was the most sensitive aquatic endpoint. In view of the results, the application of a containment or remediative procedure in the area is encouraged.
Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 km 15, 08227, Terrassa, Spain. jaume.bori@crit.upc.edu.
Jaume
J
Bori
Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 km 15, 08227, Terrassa, Spain.
Bettina
B
Vallès
Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 km 15, 08227, Terrassa, Spain.|Department of Fluid Mechanics, School of Industrial and Aeronautical Engineering of Terrassa (ETSEIAT), Technical University of Catalonia (UPC), Colón 7-11, 08222, Terrassa, Spain.
Andrés
A
Navarro
Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 km 15, 08227, Terrassa, Spain.
Maria Carme
MC
Riva
D048908:Aliivibrio fischeri / Q000187:drug effects; D000818:Animals; D001181:Arthropods / Q000187:drug effects; D001464:Barium / Q000633:toxicity; D003621:Daphnia / Q000187:drug effects; D007854:Lead / Q000633:toxicity*; D058086:Microalgae / Q000187:drug effects; D008906:Mining; D009835:Oligochaeta / Q000187:drug effects; D010944:Plants / Q000187:drug effects; D012989:Soil Pollutants / Q000633:toxicity*; D013030:Spain; D018675:Toxicity Tests / Q000379:methods; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D015032:Zinc / Q000633:toxicity*
D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D001464:Barium; D007854:Lead; D015032:Zinc
Ecotoxicity; Mine drainage water; Mine wastes; Osor; Soil contamination