Titre : |
Determination of hexavalent chromium in leather by ion-exchange chromatography. Direct method versus post-column derivatisation method |
Type de document : |
texte imprimé |
Auteurs : |
Irene Compte, Auteur ; Rosa M. Cuadros, Auteur ; Anna Bacardit, Auteur ; Felipe Combalia, Auteur ; Joaquim Font, Auteur |
Année de publication : |
2021 |
Article en page(s) : |
p. 175-182 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Chromatographie par échange d'ions Chrome hexavalent Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Extraction (chimie)
|
Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
Résumé : |
The ISO 17075-2 Standard was published in 2017. In this standard appeared for the first time the determination of hexavalent chromium in leather by liquid chromatography. Two alternative instrumental options are proposed in this method: the direct determination of the absorbance of the chromate peak (Annex B of the Standard) or after the post-column derivatisation with diphenylcarbazide (Annex C). Instrumental performance parameters and economic costs between both methods are compared in this paper. One hundred different leathers were analysed by both chromatographic systems. The two methods proved very good correlation. The post-column method has a higher instrumental sensitivity compared to the direct detection method, which is important to reduce the uncerteinty of the measure in semples around the 3mg/kg current regulatory limit. Other important advantages are its absolute selectivity, which allows the secure identification of the hexavalent chromium in all type of complicated matrixes, and the higher durability of its well protected columns due to the use of cost-effective guard columns. Due to the technical advantages and the slight difference in the equipment cost, which can be compensated thanks to the larger lifespan of the chromatographic columns, it is concluded that the post-column method is the most suitable option for the most determination of hexavalent chromium in leather. |
Note de contenu : |
- MATERIALS AND METHODS : Chemicals - Samples - Extraction
- RESULTS AND DISCUSSION : Optimisation of the post-column conditions - Method validation - Repeatability and accuracy of the post-column determination method - Analysis of leather samples - Economic assessment
- Table 1 : Optimisation of the mobile phase ionic strength
- Table 2 : Optimisation of the mobile phase flow
- Table 3 : Optimisation of the post-column reagent flow
- Table 4 : Comparison of three different cartridges
- Table 5 : Concentration of Cr(VI) obtained in 14 leather samples, all of them above 3.0 mg/kg
- Table 6 : Evaluation of the Cr(VI) results in 100 leather samples |
En ligne : |
https://drive.google.com/file/d/13VmY0k59wMY6TKIykzgnXLA9wEalFumN/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36106 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 4 (07-08/2021) . - p. 175-182