| Titre : |
A study on the reliability on UNI EN ISO 17075 method for the determination of the Cr(VI) content in leather |
| Type de document : |
texte imprimé |
| Auteurs : |
Alberto Ballardin, Auteur ; Laura Monica Iannone, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 457-461 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Cuirs et peaux -- Normes
Extraction (chimie)
Fiabilité
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The UNI EN ISO 17075 method for Cr(VI) detection in leather presents several drawbacks. One of these is the choice of an alkaline extraction pH, which produces severe false positive results.
Summary : The hexavalent chromium content in 14 leather samples, resulted positive to the presence of Cr(VI) according to the UNI EN ISO 17075 method in two certified laboratories, was re-determined, using the official extracting method at pH 8 and a different phosphate extraction buffer at pH 4.4 containing 5% NaCl. The well-known transient nature of Cr6, that is the decrease of its amount in leather during time, required a re-activation by thermal treatment before analysis. The results show that the official method systematically gives false-positive values and that 10 of the 14 examined leather samples, when extracted with a buffer at pH 4.4, proved to have acceptable levels of Cr(VI). In addition we found that Solid Phase Extraction (SPE) cartridges, either normal or end-capped, absorb about 10% of chromate and this indicates that the calibration curves should be obtained after filtering each standard with the SPE employed. |
| Note de contenu : |
- MATERIALS AND METHODS : Reagents and instruments - Analysis method - Samples
- RESULTS AND DISCUSSION : Comparison of Cr(VI) content in leathers extracted at pH 8 and 4.4 - The yield of filtration with SPE cartridges |
| En ligne : |
https://drive.google.com/file/d/1EZ7Q2b8OmmzqEjMp1xpd0oVg_Pehqfax/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20059 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 12 (12/2013) . - p. 457-461
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