| Titre : |
Ion chromatography with post column derivatization for the determination of hexavalent chromium in dyed leather. Influence of the preparation method and of the sampling location |
| Type de document : |
texte imprimé |
| Auteurs : |
Mathilde Fontaine, Auteur ; Nicolas Blanc, Auteur ; Jean-Claude Cannot, Auteur ; Claire Demesmay, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 319-326 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Chromatographie
Cuir -- Teneur en chrome hexavalent
Cuir teint
Cuirs et peaux -- Analyse
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Since 2015, a European restriction limits the hexavalent chromium content to not more than 3 mg/kg in leather products (UE-301-2014, 25 March 2014, §47, annex XVII of REACh). Owing to spectrophotometric interferences encountered with the established European standard EN ISO 17075:2007 when colored leathers have to be analyzed, this article proposes the analysis of hexavalent chromium using ion chromatography with post-column derivatization and spectrophotometric detection. In order to avoid any pre-treatment of the crude extract an on-line solid phase extraction step is introduced by inserting a high capacity reversed phase guard column. The efficiency of the on-line purification is demonstrated (quantitative removal of the dye present in the extract) and allows the direct analysis of crude extracts in less than 6 minutes. The overall chromatographic method is validated following procedures described by the French standard NF T90-210. The measurement error (bias) was determined at 7.2% at the presupposed limit of quantification 5 µg/L (corresponding to a hexavalent chromium content of 0.25 mg/kg in leather) and at the medium concentration level and at 4.0% for the high-level concentration, with relative standard deviations of 5.1%, 2.9% and 2.4% respectively. The recovery yields measured with spiked leathers range from 92 to 96% depending on the hexavalent content. The reliability of the method is also demonstrated through two inter-laboratories test involving several European laboratories. The crucial influence of the sample preparation is also assessed in this work. It is demonstrated that the hexavalent chromium content of leathers is systematically underestimated when the extraction is applied to leathers cut in small pieces and not ground. In parallel, additional tests on leather sampling location show that the shoulder zone is not representative of the rest of the skin in terms of hexavalent chromium content since it has a higher hexavalent chromium content than all other sampling zones. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Chemicals - Sample preparation - Ion chromatography -
- RESULTS AND DISCUSSION : On-line reversed phase solid phase extraction for dye removing - Validation of the analytical method - Evaluation of the reliability of IC through - Influence of the sample preparation for the analysis - Influence of the sampling location on an entire skin |
| En ligne : |
https://drive.google.com/file/d/1sYCmtm9ZvHwlNwYVbhp99LTylkXsDKVJ/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29246 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 10 (10/2017) . - p. 319-326
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Ion chromatography with post column derivatization for the determination of hexavalent chromium in dyed leather. Influence of the preparation method and of the sampling location in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 10 (10/2017)
