caa a22 4500 477048935 CHVBK 20180405111337.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00253456 doi (NATIONALLICENCE)springer-10.1007/BF00253456 Oxidation of arsenopyrite (FeAsS) in acid Part II: Stoichiometry and reaction scheme [Elektronische Daten] [P. Fernandez, H. Linge, M. Willing] The electrochemical oxidation of arsenopyrite (FeAsS) in 0.01 iv1 chloride solution at pH 2 has been investigated and the effect of electrode potential, temperature and arsenopyrite mineral composition on the reaction stoichiometry studied. Iron, arsenic and sulfur products were formed in the ratio 1 : 1 : 1, for all conditions for arsenic deficient and stoichiometric arsenopyrite. Product speciation was dependent on temperature and potential, but not on arsenopyrite composition. At 25°C, Fe(ii), Fe(iii), As(iii), As(v), S, SO 4 2− and S(x) (which could be a polythionate such as tetrathionate or pentathionate) were formed and ∼9e− produced per mol of arsenopyrite oxidized. At 75°C, practically no S(x) was formed and 7.5 e− produced per mol of arsenopyrite oxidized. A qualitative reaction scheme, based on the decomposition of thiosulfate to polythionate in the presence of As(iii), is outlined. Chapman & Hall, 1996 Fernandez P. School of Applied Chemistry, Curtin University, 6102, Bentley, Australia aut Linge H. CSIRO DMP, Curtin University, 6102, Bentley, Australia aut Willing M. CSIRO DMP, Curtin University, 6102, Bentley, Australia aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/6(1996-06-01), 585-591 0021-891X 26:6<585 1996 26 10800 https://doi.org/10.1007/BF00253456 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00253456 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fernandez P. School of Applied Chemistry, Curtin University, 6102, Bentley, Australia aut NATIONALLICENCE 700 1- Linge H. CSIRO DMP, Curtin University, 6102, Bentley, Australia aut NATIONALLICENCE 700 1- Willing M. CSIRO DMP, Curtin University, 6102, Bentley, Australia aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/6(1996-06-01), 585-591 0021-891X 26:6<585 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 477048935 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer