Iron speciation in natural organic matter colloids

Natural colloids sampled in rivers in the Nsimi region (south Cameroon) were studied by extended X-ray absorption fine structure (EXAFS) spectroscopy and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) to determine the speciation of iron within these colloids. The analysis and modeling of...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 136; no. 1; pp. 11 - 19
Main Authors Rose, Jérôme, Vilge, Astride, Olivie-Lauquet, Gwenaelle, Masion, Armand, Frechou, Carole, Bottero, Jean-Yves
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.04.1998
Elsevier
Subjects
Chemical Sciences
Continental interfaces, environment
Cristallography
Earth Sciences
Environment and Society
Environmental Engineering
Environmental Sciences
Geochemistry
Inorganic chemistry
Material chemistry
Mineralogy
Sciences of the Universe
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Summary:Natural colloids sampled in rivers in the Nsimi region (south Cameroon) were studied by extended X-ray absorption fine structure (EXAFS) spectroscopy and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) to determine the speciation of iron within these colloids. The analysis and modeling of the EXAFS spectra revealed that iron is poorly polymerized due to the complexation of Fe by the organic matter, since monodentate and bidentate complexes were detected. Py-GC-MS gave a closer insight into the chemical nature of the organic matter; the colloidal fraction, which corresponds to the EXAFS sample, consists mainly of carboxylic acids, thus explaining the high level of complexation of Fe.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(97)00150-7