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Título: | Assessment of heavy metals pollution in sulphide mine affected-soils of madrid, central spain |
Autor: | Torres, M. CSIC; Recio Vázquez, Lorena CSIC; Carral, Pilar; Álvarez, Ana María | Fecha de publicación: | 2011 | Resumen: | The uncontrolled extraction of mineral resources is considered one of the major anthropogenic sources of soil pollution. In Spain, exploitation of metallic mineral deposits and its subsequent abandonment in last decades has lead to significant environmental hazard for natural systems. In this research, potentially contaminated soils surrounding an old chalcopyrite mine district in Madrid (Central Spain) have been studied. The focus is to assess the degree of pollution by heavy metals and other trace elements as a consequence of the extraction and treatment of sulphides for several centuries. For this purpose, 15 soil samples were collected considering the distance to the source of pollution and the soil depth. The soil heavy metals speciation was determined using the BCR sequential extraction procedure (Community Bureau of Reference, European Commission) and analysed by ICP-MS for 14 elements. The total contents of these elements have been calculated as the sum of the four BCR fractions. The results showed heavy metals concentrations decreasing with the distance from the source of pollution. The highest amounts of these elements (mg¿kg-1) were found at sites close to livestock pastures (As 80±2; Cu 1679±13; Cd 5.5±0.1; Co 867±12). These values exceed the allowed limits of the local environmental regulation. Moreover, the amounts (mg¿kg-1) of some trace elements associated with the bioavailable fraction of the soil are high (Cu 419±5; Cd 3.6±0.1), suggesting that further research is needed for a better evaluation of the potential risk of contamination dispersion and the consequences of this process on the whole ecosystem. | URI: | http://hdl.handle.net/10261/82409 |
Aparece en las colecciones: | (MNCN) Comunicaciones congresos |
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