2009
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Abstract: The structures of the polynuclear hydrolysis complexes of chromium(III) formed in acidic and alkaline aqueous solution have been determined by means of extended X-ray absorption fine structure and large angle X-ray scattering. Chromium(III) is present as mononuclear hydrated ions below pH 3-4, with the upper limit depending on concentration, ionic strength, and temperature. Chromium(III) hydrolyzes in aqueous solution above this pH in concentrated aged solutions to mainly cationic tetrameric complexes containi… Show more

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“…The rate parameters can be determined from the absorbance increase at 372 nm (the k max for CrO 4 2-), from EPR signal intensity increase (formation of Cr V ) or from absorbance decrease within the d-d transition region (Cr III disappearance). The later method is less convenient because it requires two orders of magnitude higher substrate concentration, causing additional complication due to oligomerization of Cr(III) species [28]. For this reason, kinetic measurements were done at low Cr(III) concentration, in the UV region, and only in a few cases, the obtained results were compared with those obtained from visible spectra and from EPR data.…”
Section: Resultsmentioning
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rupbmjkragerfmgwileyiopcupepmcmbcthiemesagefrontiersapsiucrarxivemeralduhksmucshluniversity-of-gavle
“…The rate parameters can be determined from the absorbance increase at 372 nm (the k max for CrO 4 2-), from EPR signal intensity increase (formation of Cr V ) or from absorbance decrease within the d-d transition region (Cr III disappearance). The later method is less convenient because it requires two orders of magnitude higher substrate concentration, causing additional complication due to oligomerization of Cr(III) species [28]. For this reason, kinetic measurements were done at low Cr(III) concentration, in the UV region, and only in a few cases, the obtained results were compared with those obtained from visible spectra and from EPR data.…”
Section: Resultsmentioning
“…and tetrameric ([Cr 4 (OH) 6 ] 6? ) species [24,26,27]. The chromium species inserted in Cr-PILC are mostly polynuclear hydroxospecies formed by hydrolysis of the Cr(III) monomer [28].…”
Section: Introductionmentioning
“…The chromium species inserted in Cr-PILC are mostly polynuclear hydroxospecies formed by hydrolysis of the Cr(III) monomer [28]. The hydrated Cr(III) ion hydrolyzes easily at pH 2-4, depending on the total concentration, temperature, ionic strength and medium [27].…”
Section: Introductionmentioning
“…These cations are also known to form dimeric, trimeric or tetrameric complexes with tetravalent to hexavalent charges (e.g. Torapava, Radkevich, Davydov, Titov, & Persson, 2009) in acidic solutions. Aqueous cations of Cr(III) exhibit a pH-dependent adsorption on particle surfaces of clay minerals (Charlet & Manceau, 1992;Corker, Evans, & Rummey, 1991) and Al/Fe-oxyhydroxides (see Richard &Bourg, 1991 andFendorf, 1995 for reviews).…”
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