Interaction of gypsum with As(V)-bearing aqueous solutions: Surface precipitation of guerinite, sainfeldite, and Ca2NaH(AsO4)2·6H2O, a synthetic arsenate

@article{Rodrguez2008InteractionOG,
  title={Interaction of gypsum with As(V)-bearing aqueous solutions: Surface precipitation of guerinite, sainfeldite, and Ca2NaH(AsO4)2·6H2O, a synthetic arsenate},
  author={Juan D. Rodr{\'i}guez and Amalia Jim{\'e}nez and Manuel Prieto and Laura Della Torre and Santiago Garc{\'i}a‐Granda},
  journal={American Mineralogist},
  year={2008},
  volume={93},
  pages={928 - 939}
}
Abstract The interaction of arsenate-bearing aqueous solutions with gypsum at a starting pH of 9 and 25 °C results in surface precipitation of guerinite, Ca5(HAsO4)2(AsO4)2·9H2O, sainfeldite, Ca5(HAsO4)2(AsO4)2·4H2O, and occasionally Ca2Na(HAsO4)(AsO4)·6H2O, a new arsenate. These three solid phases are characterized by the simultaneous presence of HAsO42- and AsO43- groups in their structure, which is explainable since crystallization occurs within a pH range in which both HAsO42- and AsO43… Expand

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