Speciation and solubility of Co(Ⅱ) in the system Co-O-H-Cl-S at saturated water vapor pressure up to 300 ℃

摘要：

Available thermodynamic data for aqueous complexes of Co(Ⅱ) with hydroxide, chloride and bisulfide have been critically evaluated and extrapolated to 300 ℃ at saturated water vapor pressure. Speciation of Co(Ⅱ) in hydrothermal solutions and the solubility of Co(Ⅱ)-oxide and-sulfide minerals have been calculated.Although bisulfide complexes have rather wide predominance fields at geologically reasonable values of pH,∑Cl and ∑S, especially at lower temperatures, the solubility of Co(Ⅱ) minerals is very low where bisulfide complexes predominate. Significant solubility of Co(Ⅱ) is therefore only likely under conditions where chloride complexes predominate, specifically at low pH (less than ～4) or high oxygen fugacity (hematite-stable) or both.

作者: S.A.Wood A.E.Williams-Jones

作者单位: Department of Geological Sciences, University of Idaho, Moscow, Idaho, USA Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 395-398

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）