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Title (Primary) Kinetics of the arsenite oxidation in a seepage water of a tin mill tailing pond
Author Daus, B.; Mattusch, J.; Paschke, A.; Wennrich, R.; Weiß, H.
Journal Talanta
Year 2000
Department OEC; ANA; GWS; COE
Volume 51
Issue 6
Page From 1087
Page To 1095
Language englisch
Keywords Arsenic; Speciation; Oxidation kinetics; Minings
Abstract The kinetic of the oxidation of trivalent arsenic was investigated in synthetic as well as in natural samples of a tin mill seepage water. The influence of ferric ions and solid MnO2 on the process was studied. To determine the time dependence of the concentrations of the arsenic species, a series of samples were taken sequentially and analysed by coupling of ionchromatographic separation and ICP-MS detection. To investigate the naturally occurring oxidation reaction, original seepage water samples were filtered and spiked with As(III) (1 mg l−1) and Fe(II) (10 mg l−1) and shaken providing intensive contact with the air. Additional synthetic samples buffered with carbonate were used in similar experiments to simplify the system. The reaction was incomplete in the presence of excess of iron for both types of samples. The oxidation of As(III) was complete within 8 h in the presence of MnO2 (10 mg), but there was a difference in oxidation rates between the natural and the synthetic samples. The results are discussed with respect to the redox potentials and equilibrium constants.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=7073
Daus, B., Mattusch, J., Paschke, A., Wennrich, R., Weiß, H. (2000):
Kinetics of the arsenite oxidation in a seepage water of a tin mill tailing pond
Talanta 51 (6), 1087 - 1095