The oxidation of ferrous hydroxide in chloride-containing aqueous media and pourbaix diagrams of green rust one

摘要: The oxidation of a ferrous hydroxide precipitated by mixing solutions chloride and caustic soda depends on the ratio R′ = Cl−/OH− initial concentrations reactants. mechanisms for 1 < ≤ 3 are related to existence ferrous-ferric compound green rust (GR1). direct recording pH electrode potential allows trigger value R′c 87 be determined, which is found correspond stoichiometric conditions obtention GR1. By coupling this information with that obtained from three iron sites R1, R2, R3 detected Mossbauer spectroscopy, formula GR1 set up at 3Fe(OH)2 · Fe(OH)2Cl nH2O. Thus contains an equal number Cl− Fe3+ ions. standard chemical μ0 determined −509,500 ± 500 cal mol−1 n 0. Eh/pH Pourbaix diagrams specific in chloride-containing aqueous media, including GR1, drawn.