Formation of sulphated green rust II Fe-6(OH)(12)SO4 by oxidation of ferrous sulphate by water

Authors
Bessiere, J Perdicakis, M Humbert, B
Citation
J. Bessiere et al., Formation of sulphated green rust II Fe-6(OH)(12)SO4 by oxidation of ferrous sulphate by water, CR AC S IIC, 2(2), 1999, pp. 101-105
Citations number
27
Categorie Soggetti
Chemistry
Journal title
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE
ISSN journal
13871609 → ACNP
Volume
2
Issue
2
Year of publication
1999
Pages
101 - 105
Database
ISI
SICI code
1387-1609(199902)2:2<101:FOSGRI>2.0.ZU;2-H
Abstract
Sulphated green rust can result from the partial oxidation of FeSO4 by wate r itself in the presence of sodium hydroxide (Fe(II)/OH- = 0.600). The equi librium constant of the reaction is higher than 3.10(4), the standard poten tial of Fe-6(OH)(12)SO4/Fe(OH)(2) system being -0.56 V vs. NHE. An equipmen t under vacuum allows to detect the hydrogen release and to evidence the ty pical blue-green colour of the GR otherwise identified by its Raman spectru m. Consequently this compound can be formed in anoxic media; it is stable i n the presence of hydrogen. (C) Academie des sciences/Elsevier, Paris.