Goethite Mossbauer spectroscopy

On the basis of a number of physico-chemical methods (Mossbauer spectroscopy, electron diffraction, EXAFS) the iron cores of naturally occurring haemosiderins isolated from various iron-loaded animals and man (horse, reindeer, birds and human old age) were consistently shown to have ferrihydrite-like iron cores similar to those of ferritin (Ward et ah, 1992, 2000). In marked contrast, in the tissues of patients with two pathogenic iron-loading syndromes, genetic haemochromatosis and thalassaemia, the haemosiderins isolated had predominantly amorphous ferric oxide and goethite cores, respectively (Dickson etah, 1988 Mann etah, 1988 ... 

Spectroscopic techniques may provide the least ambiguous methods for verification of actual sorption mechanisms. Zeltner et al. (Chapter 8) have applied FTIR (Fourier Transform Infrared) spectroscopy and microcalorimetric titrations in a study of the adsorption of salicylic acid by goethite these techniques provide new information on the structure of organic acid complexes formed at the goethite-water interface. Ambe et al. (Chapter 19) present the results of an emission Mossbauer spectroscopic study of sorbed Co(II) and Sb(V). Although Mossbauer spectroscopy can only be used for a few chemical elements, the technique provides detailed information about the molecular bonding of sorbed species and may be used to differentiate between adsorption and surface precipitation. 

The presence of Zn ions in the precipitation system [298] affected the formation of elongated Zn-substituted a-FeOOH particles as a single phase up to 9 mol% Zn. At the Zn content of I I mol% Zn-ferrite particles were formed besides elongated Zn-substituted a-FeOOH particles. At l3mol% of Zn, three phases were detected by Mossbauer spectroscopy Zn-substituted goethite, hematite, and Zn-ferrite. 

The influence of the V " " ion presence during the formation of goethite from ferrihydrite in an alkaline medium was investigated using Mossbauer spectroscopy and other techniques by Kaur et al. [249]. The presence of ions reduced HMF values in the Mossbauer spectra due to a substitution of Fe by V ions (ionic radius of 0.64 A almost equal to the radius of Fe " ") in the goethite structure. Small quantities of hematite and superparamagnetic goethite were also formed. 

Influence of Tetravalent Cations The influence of the Ti ion presence during the formation of goethite from ferric solution in an alkaline medium was investigated by Mossbauer spectroscopy and other techniques [246]. The presence of Ti " " ions partially suppressed the transformation of ferrihydrite to goethite and as a result a quadrupole doublet, corresponding to the low-crystalline phase, emerged in the Mossbauer spectrum. 

G. Klingelhofer, E. De Grave, R.V. Morris, A Alboom, V.G. Resende, P.A Souza Jr, D. Rodionov, C. Schroeder, D.W. Ming, A. Yen, Mossbauer spectroscopy on Mars goethite in the Columbia Hills at Gusev crater. Hyperfine Interact. 166, 549 (2006)... 

Application of Mossbauer Spectroscopy Table 3.2 Summary of hypeifine parameters for goethite... 

D.D. Amasiriwardena, E. De Grave, L.H. Bowen, S.B. Weed, Quantitative determination of aluminium-substituted goethite-hematite mixtures by Mossbauer spectroscopy. Clays Clay Miner. 34, 250-256 (1986)... 

R.E. Vandenberghe, E. De Grave, G. De Geyter, C. Landuydt, Characterization of goethite and hematite in a Tunisian soil profile by Mossbauer spectroscopy. Qays Qay Miner. 34, 275-280 (1986)... 

J. Fleisch, R. Grimm, J. Grlibler, P. Gtitlich, Determination of the aluminum content in natural and synthetic alumo-goethites using Mossbauer spectroscopy. J. Phys. Colloq. Cl(41), 169-170 (1980)... 

During the nineties he continued with fundamental studies on goethite and hematite. His application of Mossbauer spectroscopy went particularly to the characterization of Fe-bearing compounds in soils and sediments. In that respect, he cooperated with many laboratories of geology and soil sciences. His is author or co-author of more than 150 papers and several chapters in books. He was several times invited as plenary speaker at international conferences. 

Goodman, B.A. Cheshire, M.V. (1987) Characterization of iron-fulvic acid complexes using Mossbauer and FPR spectroscopy. Sci. Total Fnviron. 62 229-240 Goodman, B.A. Lewis, D.G. (1981) Mossbauer spectra of aluminous goethites (a-FeOOH). J. Soil Sci. 32 351-363 Goodman, B.A. (1988) An introduction to physical and chemical principles. In Studd, J.W. Goodman, B.A. Schwertmann, U. (eds.) Iron in soils and day minerals. D. Reidel Publ. Co., Dordrecht, Holland, NATO ASI Sen 217 19-36... 

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