Summary
Orthorhombic barium thiosulfate monohydrate, triclinic barium thiosulfate fluoride, triclinic barium sulfite and monoclinic hydrated barium aluminium trisulfide hydroxide have been isolated and identified as natural weathering products in old smelting mill slags. None of them have been found in nature before, but two of them are known as laboratory products. They represent a stepwise sequence in sulfur oxidation numbers and are potential intermediates in the familiar but little-understood oxidation of sulfides to sulfates and thus throw light on the mechanism of the natural oxidation of sulfide ores. The nature of these phases and co-existing species suggests formation between about Eh -0.45 v at pH 11 and Eh -0.6 v at pH 13.[▭
Zusammenfassung
Orthorhombisches Barium—Monohydrat, triklines Barium-ThiosulfattFluorid, triklines Barium-Sulfit und monoklines, hydriertes Barium-Aluminium-Trisulfid-Hydroxyd sind isoliert und als natürliche Verwitterungsprodukte in alten Schmelzschlacken identifiziert worden. Keine dieser Verbindungen sind bisher in der Natur nachgewiesen worden, jedoch sind zwei davon als Kunstprodukte bekannt. Sie stellen eine schrittweise Abfolge von Schwefeloxydationszahlen dar und sind potentielle Zwischenglieder in der bekannten, aber wenig verstandenen Oxydation von Sulfiden zu Sulfaten. In diesem Sinne werfen sie auch Licht auf den Mechanismus der natürli-chen Oxydation von Sulfiderzen. Die Art dieser und koexistierender Verbindungen legt eine Bildung zwischen Eh -0.45 v bei pH 11 und Eh -0.6 v bei pH 13 nahe.
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Braithwaite, R.S.W., Kampf, A.R., Pritchard, R.G. et al. The occurrence of thiosulfates and other unstable sulfur species as natural weathering products of old smelting slags. Mineralogy and Petrology 47, 255–261 (1993). https://doi.org/10.1007/BF01161570
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DOI: https://doi.org/10.1007/BF01161570