Dissolution of Cr2O3(s) and the behavior of chromium in concentrated NaOH solutions / Barbara Zydorczak in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16537–16543 Titre : Dissolution of Cr2O3(s) and the behavior of chromium in concentrated NaOH solutions Type de document : texte imprimé Auteurs : Barbara Zydorczak, Auteur ; Peter M. May, Auteur ; Danielle P. Meyrick, Auteur Année de publication : 2012 Article en page(s) : pp. 16537–16543 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydroxide Résumé : The solubility of Cr2O3(s) in (1 and 6) mol kg–1 sodium hydroxide solutions has been investigated at 25 °C. Even after 75 days of solid/solution contact the apparent solubility continued to increase slowly. Analysis of the solution phase by UV–vis spectrophotometry revealed that all of the dissolved chromium was present as Cr(VI), in the form of CrO42–(aq); no Cr(III) could be detected. Consistent with this finding, Cr(III) dissolved in 6 mol kg–1 NaOH was found to be oxidized to CrO42–(aq) over of period of days. No significant changes to the solid phase, Cr2O3(cr), were found, either by X-ray diffraction or by X-ray photoelectron spectroscopy, as a result of its contact with NaOH(aq). Both CrO42– and Cr(III) were found to be unreactive toward a range of organic and inorganic compounds in 6 mol kg–1 NaOH over many days at ambient temperatures. However, CrO42– catalyzed the decomposition of L-ascorbate, and was rapidly reduced by elemental Zn to Cr(III) in NaOH(aq). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302096e [article] Dissolution of Cr2O3(s) and the behavior of chromium in concentrated NaOH solutions [texte imprimé] / Barbara Zydorczak, Auteur ; Peter M. May, Auteur ; Danielle P. Meyrick, Auteur . - 2012 . - pp. 16537–16543. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16537–16543 Mots-clés : Hydroxide Résumé : The solubility of Cr2O3(s) in (1 and 6) mol kg–1 sodium hydroxide solutions has been investigated at 25 °C. Even after 75 days of solid/solution contact the apparent solubility continued to increase slowly. Analysis of the solution phase by UV–vis spectrophotometry revealed that all of the dissolved chromium was present as Cr(VI), in the form of CrO42–(aq); no Cr(III) could be detected. Consistent with this finding, Cr(III) dissolved in 6 mol kg–1 NaOH was found to be oxidized to CrO42–(aq) over of period of days. No significant changes to the solid phase, Cr2O3(cr), were found, either by X-ray diffraction or by X-ray photoelectron spectroscopy, as a result of its contact with NaOH(aq). Both CrO42– and Cr(III) were found to be unreactive toward a range of organic and inorganic compounds in 6 mol kg–1 NaOH over many days at ambient temperatures. However, CrO42– catalyzed the decomposition of L-ascorbate, and was rapidly reduced by elemental Zn to Cr(III) in NaOH(aq). ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302096e

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