| Titre : |
Controlling Cr(VI) in leather : A review from passive prevention to stabilization of chromium complexes |
| Type de document : |
texte imprimé |
| Auteurs : |
Chen Jing, Auteur ; Zhou Nan, Auteur ; Wuyong Chen, Auteur ; Sun Shiyu, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 250-257 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuir -- Teneur en chrome hexavalent
Cuir -- Teneur en chrome trivalent
Stabilisants (chimie)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The Cr(VI) content in leather has garnered much attention in today's world of increasingly stringent environmental and safety regulations. In addition, the European Union (EU) countries have zero tolerance policies. For chromium-tanned leather, there is a risk of converting trivalent chromium into the hexavalent form in the processes of production, storage, transportation and usage. In this article, the routes for the occurrence of Cr(VI) are briefly analyzed, and the various types of Cr(VI) control technologies in leather manufacturing processes are reviewed. One control technology is passive PREVENTION, which could inhibit the hexavalent chromium to some extent through the addition of antioxidants and reducing agents, but it might not fundamentally solve the hexavalent problem. In contrast, CONSOLIDATION technologies to improve the stabilization of chromium complexes could play critical and responsible roles to effectively prevent the emergence of hexavalent chromium in leather. Several proposals are addressed for the control of Cr(VI) in leather, and CONSOLIDATION technology is determined to be more important than PREVENTION technology. In addition, a new viewpoint is presented to completely solve the problem based on the stability of Cr3+ complexes. Taking the amount of Cr(VI) as a quantitative indicator, the mechanisms and key technologies for the effect of specific coordinating compounds (ligands) on the stability of Cr3+ to prevent Cr(VI) formation would be recommended for further study toward. |
| Note de contenu : |
- PASSIVE PREVENTION OF CR(VI) : Sulfur compounds and small molecule phenols - Vegetal tanning extracts - Other natural polymers
- STABILIZATION OF CHROMIUM COMPLEXES : Small molecule compounds - High-molecular-weight polymers - Others |
| En ligne : |
https://drive.google.com/file/d/1mYL7N8y2yVBPby2QOd5E34CzIFGOwrbS/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28823 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 7 (07/2017) . - p. 250-257
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Controlling Cr(VI) in leather : A review from passive prevention to stabilization of chromium complexes in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)
