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Oxidation of HSO3-in aqueous suspensions of alpha-Fe2O3, alpha-FeOOH, beta-FeOOH and gamma-FeOOH in the dark and under illumination
1997
Ansari, A. | Peral, J. | Domenech, X. | Rodriguez-Clemente, R. (Departament de Quimica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain))
The synergism between SO2 oxidation and manganese leaching on spruce needles - a chamber experiment
1997
Burkhardt, J. | Drechsel, P. (Department of Agroecology, University of Bayreuth, D-95440 Bayreuth (Germany))
Weathering processes under various moisture conditions in a lignite mine spoil from as pontes (N.W. Spain)
1997
Seoane, S. | Leiros, M. C.
Processes contributing to acid release/consumption during weathering of a lignite mine spoil (2.3% w/w S as sulfides) from As Pontes (N.W. Spain) were studied under three moisture conditions (at field capacity or under alternate wetting-drying or forced percolation), which were simulated in laboratory experiments. Oxidation of sulfides to sulfates was favoured under all three moisture conditions, releasing most acid in spoil kept at field capacity. Hydroxysulfates formed in spoil kept at field capacity or under alternate wetting-drying conditions, thereby contributing to acid release. Acid consumption by dissolution of clay minerals, especially micas, was favoured under all three moisture conditions, but was particularly intense in spoil at field capacity. Dissolution of aluminium oxides was also favoured under all the moisture conditions studied.
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