1. Recrystallization and stability of Zn and Pb minerals on their migration to groundwater in soils affected by Acid Mine Drainage under CO2 rich atmospheric waters.
- Author
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Goienaga N, Carrero JA, Zuazagoitia D, Baceta JI, Murelaga X, Fernández LA, and Madariaga JM
- Subjects
- Groundwater analysis, Hydrogen-Ion Concentration, Lead chemistry, Minerals analysis, Mining, Soil chemistry, Soil Pollutants chemistry, Spain, Water Pollutants, Chemical chemistry, Zinc chemistry, Environmental Monitoring, Lead analysis, Minerals chemistry, Soil Pollutants analysis, Water Pollutants, Chemical analysis, Zinc analysis
- Abstract
The extent of vertical contamination is intimately related to the soil solution and surface chemistry of the soil matrix with reference to the metal and waste matrix in question. The present research demonstrated the impact that the dissolved CO2 of the meteoric waters, which acidify the environment with pH values below 4, has in the increase of the metal mobility. Although under the given conditions the Zn remains mainly dissolved, the initial PbS and ZnS have evolved into newly formed secondary carbonates and sulphates (i.e., hydrozincite, gunningite, hydrocerussite) that can be found in the efflorescences. The chemical simulation done on the weathering of the original sulphide ores for the formation of these secondary minerals has proved the transient storage mainly of Pb. Nonetheless, many of the minerals formed inside the galleries will be easily dissolved in the next rains and release in an ionic form to the groundwater. The analytical procedure exposed has been proved to be useful not only for the characterization of AMD but also for the prediction of the mobility of metals., (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Published
- 2015
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