title: Geochemistry and environmental threats of soils surrounding an abandoned mercury mine.
abstract: The closure of mercury mining areas is generally associated with a release of Hg and other metals into the environment due to the abandonment of mining wastes. Because of their potential toxic properties, the mobilization of particulate and soluble metal species is of major concern. In the present study, the environmental risks posed by soils surrounding an abandoned mercury mining area in Valle del Azogue (Almeria, Spain) are assessed through the determination of physical-chemical parameters, the quantification of metal concentrations, and the application of aquatic and terrestrial ecotoxicity bioassays. Chemical analysis of soil samples revealed concentrations of Hg, As, Ba, Pb, Sb, and Zn above international intervention values. Results from terrestrial tests showed detrimental effects in all studied organisms (Eisenia foetida, Folsomia candida, and different plant species) and revealed the avoidance response of earthworms as the most sensitive endpoint. Surprisingly, the most toxic samples were not the ones with higher metal contents but the ones presenting higher electrical conductivity. Aquatic ecotoxicity tests with Vibrio fischeri, Raphidocelis subcapitata, Daphnia magna, and Danio rerio were in accordance with terrestrial tests, confirming the need to couple environmental chemistry with ecotoxicological tools for the proper assessment of metal-contaminated sites. In view of the results, a remediative intervention of the studied area is recommended.
authors.affiliation: Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 Km 15, 08227, Terrassa (Barcelona), Spain. jaume.bori@crit.upc.edu.
authors.forename: Jaume
authors.initials: J
authors.lastname: Bori
authors.affiliation: Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 Km 15, 08227, Terrassa (Barcelona), Spain.
authors.forename: Bettina
authors.initials: B
authors.lastname: Vallès
authors.affiliation: Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 Km 15, 08227, Terrassa (Barcelona), Spain.|Dep. M. Fluidos, ETSEIAT, Universitat Politècnica de Catalunya (UPC), Colón, 7, 08222, Terrassa (Barcelona), Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Navarro
authors.affiliation: Center for Research and Innovation in Toxicology (CRIT-Innotex Center), Universitat Politècnica de Catalunya (UPC), Ctra. Nac. 150 Km 15, 08227, Terrassa (Barcelona), Spain.
authors.forename: Maria Carme
authors.initials: MC
authors.lastname: Riva
mesh_terms: D000818:Animals; D001181:Arthropods / Q000187:drug effects; D001681:Biological Assay; D003621:Daphnia / Q000187:drug effects; D004784:Environmental Monitoring; D008628:Mercury / Q000032:analysis*; D008906:Mining; D009835:Oligochaeta / Q000187:drug effects; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D015027:Zebrafish
chemical_list: D012987:Soil; D012989:Soil Pollutants; D008628:Mercury
keywords: Ecotoxicity; Mercury mine; Soil contamination; Water extracts