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A Raman spectral study of stream waters and efflorescent salts in Rio Tinto, Spain

AuthorsSobrón, Pablo CSIC; Sanz-Arranz, Aurelio; Acosta, Tayro; Rull, Fernando ORCID
KeywordsRaman spectroscopy
Issue DateJan-2009
CitationSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 71(5): 1678-1682 (2009)
AbstractAcidic waters and sulfate-rich precipitates are found in mine tailings such as Rio Tinto (Huelva, SW, Spain). In this work we have characterized the chemical constituents of stream water and have identified some efflorescent salts and precipitates by means of Raman spectroscopy. Variable amounts of sulfate and bisulfate are found in the aqueous samples, suggesting changes in the acidity of the solutions. An estimation of the sulfate/water relative abundance is also given. Solid samples are readily identified as gypsum and as mixtures of hydrated hydroxysulfates belonging to the copiapite group. These results are consistent with previous works reporting the mineralogy and water composition of acid mine drainage-related sites, and proves the importance of Raman spectroscopy as a tool for accurate and noninvasive analyses of acid waters and associated geochemistry.
Description5 pages, 6 figures.-- PMID: 18692432 [PubMed].-- Available online Jul 9, 2008.
Publisher version (URL)http://dx.doi.org/10.1016/j.saa.2008.06.035
Appears in Collections:(CAB) Artículos
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