Abstract
On 1998, a settling pond of a pyrite mine in Aznalcóllar (SW Spain) broke open, spilling some 3.6 × 106 m3 of water and 0.9 × 106 m3 of toxic tailings into the Agrio and Guadiamar river basin 40 km downstream, nearly to Doñana National Park. The soils throughout the basin were studied for arsenic pollution. Almost all the arsenic penetrated the soils in the solid phase (tailings) in variable amounts, mainly as a result of the different soil structure. The chemical oxidation of the tailings was the main cause of the pollution in these soils. A study of the relationships between the main soil characteristics and arsenic extracted with different reagents (water, CaCl2, acetic acid, oxalic–oxalate and EDTA) indicates a direct relationship with the total arsenic concentration. The highest amount of arsenic was extracted by oxalic–oxalate (24%–36% of the total arsenic), indicating the binding with the iron oxides.
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Acknowledgments
This study has been made possible by the research contract no. 1437 of the Regional Environmental Department of the Andalusian Government. Also thanks to Mr. David Nesbitt for the English correction of the manuscript.
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Aguilar, J., Dorronsoro, C., Fernández, E. et al. Arsenic Contamination in Soils Affected by a Pyrite-mine Spill (Aznalcóllar, SW Spain). Water Air Soil Pollut 180, 271–281 (2007). https://doi.org/10.1007/s11270-006-9269-9
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DOI: https://doi.org/10.1007/s11270-006-9269-9