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Journal of Soils and Sediments

, Volume 16, Issue 4, pp 1238–1252 | Cite as

Geochemical characterisation of surface waters, topsoils and efflorescences in a historic metal-mining area in Spain

  • Carmen Pérez-SirventEmail author
  • Carmen Hernández-Pérez
  • María José Martínez-Sánchez
  • Mari Luz García-Lorenzo
  • Jaume Bech
Soil Pollution and Remediation

Abstract

Purpose

Mining activities generate large amounts of wastes that may contain potentially toxic elements (PTE), which, if released into the environment, may cause air, water and soil pollution long after mining operations have ceased. This paper describes the environmental relevance of efflorescences, topsoils and surface waters from the abandoned mine of Sierra Minera of Cartagena-La Unión, SE Spain. The exposure of the population to arsenic and the associated risk were also assessed.

Materials and methods

A total of 10 topsoils and surface waters and 11 efflorescences affected at varying degrees by mining activities were studied. The total potentially toxic element content (As, Cd, Cu, Fe, Pb and Zn) was determined in all samples. In addition, the mineralogical composition of solid samples was determined by X-ray diffraction and some efflorescences were also analysed using a scanning electron microscopy-energy dispersive X-ray spectrometer. Finally, an arsenic-intake risk assessment was carried out, both as regards carcinogenic and non-carcinogenic effects and considering the total and the bioaccesible As content.

Results and discussion

The study area is heavily polluted as a result of historical mining and processing activities, during which time great amounts of wastes were produced, characterised by a high PTE content, acidic pH and minerals resulting from supergene alteration. The supergene mineralogical assemblages include soluble metal salts, mainly sulphates, iron hydroxysulphates and iron oxyhydroxides, all of which form ochreous precipitates. Topsoil samples showed risk values and hazard quotients higher than the reference levels, particularly for children. In the efflorescences, these values were lower but still unacceptable.

Conclusions

The efflorescences are of significance for monitoring purposes because they are involved in cycles of retention release of hydrogen ions, sulphate and potentially toxic elements. In addition, in a semi-arid climate, such as the study area, these minerals contribute to our understanding of the response of the system to episodic rainfall events. In general, it was observed that the arsenic in collected samples represent a potential risk for human health through ingestion.

Keywords

Acid mine drainage Potentially toxic elements Risk assessment Sulphate efflorescences 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Carmen Pérez-Sirvent
    • 1
    Email author
  • Carmen Hernández-Pérez
    • 1
  • María José Martínez-Sánchez
    • 1
  • Mari Luz García-Lorenzo
    • 2
  • Jaume Bech
    • 3
  1. 1.Department of Agricultural Chemistry, Geology and Pedology, Faculty of ChemistryUniversity of MurciaMurciaSpain
  2. 2.Department of Petrology and Geochemistry, Faculty of GeologyUniversity Complutense of MadridMadridSpain
  3. 3.Soil Science Laboratory, Faculty of BiologyUniversity of Barcelona (UB)BarcelonaSpain

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