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Instability of AMD samples and evolution of ochre precipitates under laboratory conditions

Teresa M. Valente, Lucia M. Guise and Carlos A. Leal Gomes
Instability of AMD samples and evolution of ochre precipitates under laboratory conditions
Geochemistry - Exploration, Environment, Analysis (May 2011) 11 (2): 71-77

Abstract

Acid mine drainage (AMD) is a particular focus of environmental research, involving the examination of many pollutants and their reactivity. Special attention must be paid for an accurate characterization of AMD samples in the field and in the laboratory. AMD samples are typically unstable due to the presence of colloidal material such as iron oxyhydroxides and bacteria. They induce physical and chemical transformations that may affect the analytical results. Variations in pH are recorded within days following sample collection, indicating changes in their chemistry. The present work demonstrates evidence of the instability of AMD samples, through the results of monitoring experiments performed under different laboratory conditions. Expeditious indicators, such as pH and electrical conductivity (combined with the analysis of crystallinity, composition and morphology of the resulting precipitates), allow monitoring of the evolution of the samples. The results also provide information about the transformation of the typical ochre products that precipitate from AMD, suggesting the formation of schwertmannite and its evolution to a more crystalline mineral.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 11
Serial Issue: 2
Title: Instability of AMD samples and evolution of ochre precipitates under laboratory conditions
Affiliation: Universidade do Minho, Departamento de Ciencias da Terra, Braga, Portugal
Pages: 71-77
Published: 201105
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 25
Accession Number: 2011-052142
Categories: General geochemistryEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N41°52'60" - N41°52'60", W08°40'60" - W08°40'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201129
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