| Titre : |
The impact of lowering the Cr(VI) detection limit in leather : implications on quantitative analysis |
| Type de document : |
texte imprimé |
| Auteurs : |
S. J. Davis, Auteur ; William R. Wise, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 191-195 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse quantitative (chimie)
Chimie analytique -- Normes
Chromatographie
Colorimétrie
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Produits chimiques -- Détection
Risques pour la santé
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The topic of chromium (VI) in leather has been debated by the whole supply chain for years. Its significance has recently been raised due to release of a consultation document by the European Chemicals Agency on skin sensitising substances, in which it was proposed that the acceptable Cr(VI) concentrations in leather goods should be lowered from 3ppm to 1 ppm. The proposition of a stricter limit and analytical difficulties at the current 3ppm compliance limit advocate the need for a review of current standards.
Recent research by the Institute for Creative Leather Technologies (ICLT) has investigated both the colorimetric (Part 1) and chromatographic (Part 2) methods under BS EN ISO 17075. The focus of the study was to identify possible sources of interference leading to false results, and calculate the limit of quantification with respect to the proposed new compliance limit.
Studies into the colorimetric method have shown the presence of Cr(III), dyes and proteins can be significant interferences becoming critical at low Cr(VI) concentrations. Dilution factors lead to the detection of < 1 pM Cr(VI) in solution and BS EN ISO 17075-1 were concluded to be not capable of resolving to 3ppm or 1 ppm in leather. Possible improvements to test methods are discussed although these would still not allow a lppm detection. It is suggested the ion-chromatographic (IC) aspect of BS EN ISO 17075-2 should be coupled to an inductively coupled plasma (ICP) ionisation system with mass spectrometry (MS) detector to enhance detection limits. |
| Note de contenu : |
- Methodology
- Direct Cr(VI) detection (BS EN ISO 17075-2:2017 annex B) method conditions
- Chromatographic conditions with post-column DPC reaction (BS EN ISO 1707562/2017 annex C)
- Recommendations
- Table 1 : Concentrations of Cr(VI) in solution equating to the current and proposed compliance limits in leather
- Table 2 : Limits of quantification for the colorimetric and chromatographic methods of BS EN ISO 17075
- Table 3 : Interlaboratory reproducibility data of the colorimetric and chromatographic methods of BS EN ISO 17075 at a 3ppm compliance limit
- Table 4 : Average accuracies of the BS EN ISO 17075 test methods at the solution concentrations relating to the current compliance limits |
| En ligne : |
https://drive.google.com/file/d/1vWzvxQ7MI6hRFXV1Gu3glO7ACHO-U0Qj/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37884 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 4 (07-08/2022) . - p. 191-195
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The impact of lowering the Cr(VI) detection limit in leather : implications on quantitative analysis in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 4 (07-08/2022)
