Inorganic arsenic speciation at river basin scales: the Tinto and Odiel rivers in the Iberian Pyrite Belt, SW Spain

Environmental Pollution
Aguasanta M SarmientoM Egal

Abstract

The Tinto and Odiel rivers are heavily affected by acid mine drainage from mining areas in the Iberian Pyrite Belt. In this work we have conducted a study along these rivers where surface water samples have been collected. Field measurements, total dissolved metals and Fe and inorganic As speciation analysis were performed. The average total concentration of As in the Tinto river (1975 microg L(-1)) is larger than in the Odiel river (441 microg L(-1)); however, the mean concentration of As(III) is almost four times higher in the Odiel. In wet seasons the mean pH levels of both rivers (2.4 and 3.2 for the Tinto and Odiel, respectively) increase slightly and the amount of dissolved total arsenic tend to decrease, while the As(III)/(V) ratio strongly increase. Besides, the concentration of the reduced As species increase along the water course. As a result, As(III)/(V) ratio can be up to 100 times higher in the lower part of the basins. An estimation of the As(III) load transported by both rivers into the Atlantic Ocean has been performed, resulting in about 60 kg yr(-1) and 2.7t yr(-1) by the Tinto and Odiel rivers, respectively.

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Citations

Jul 23, 2013·Environmental Science and Pollution Research International·Yanwen QinYanmin Zhao
Oct 8, 2013·Environmental Science and Pollution Research International·A HierroJ P Bolivar
Nov 15, 2015·Environmental Science and Pollution Research International·M L de la TorreI Ramos
Aug 4, 2012·Marine Pollution Bulletin·Milagrosa OlivaMaría Dolores Galindo-Riaño
Aug 12, 2014·Environmental Science. Processes & Impacts·Yasumasa OgawaNoriyoshi Tsuchiya
Apr 2, 2019·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Magdalena Jabłońska-Czapla, Piotr Zerzucha
Dec 6, 2011·Journal of Environmental Monitoring : JEM·Raquel LariosIsabel Rucandio
Aug 15, 2021·The Science of the Total Environment·Antónia Juliana Pais-CostaMónica Martinez-Haro
Aug 28, 2021·International Journal of Environmental Research and Public Health·José A GrandeAguasanta Miguel Sarmiento

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