ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Fe(II)-Fe(III) hydroxysulphite Green Rust 1, GR1(SO3 2−), can be obtained by oxidation of Fe(OH)2 precipitates in aqueous solution and characterised by X-ray diffraction and Mössbauer spectroscopy. In contrast to other Green Rusts (GRs) which then oxidise directly into ferric oxyhydroxides and magnetite, GR1(SO3 2−) first oxidises into a Green Rust two compound, as identified by X-ray diffraction. Mössbauer analysis reveals that this GR2 is the Fe(II)-Fe(III) hydroxysulphate, GR2(SO4 2−). Such an oxidation process, GR1(SO3 2−) → GR2(SO4 2−) confirms that the average oxidation number of Fe increases according to the chemical formulae previously proposed, [FeII 6FeIII 2(OH)16]2+[SO3 · mH2O]2−, and [FeII 4FeIII 2(OH)12]2+[SO4 · nH2O]2− for GR1(SO3 2−) and GR2(SO4 2−) with oxidation numbers of 2.25 and 2.33, respectively. The process implies likely the presence of sulphate ions inherent to the oxidation of sulphite in the solution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1010845107110
