![](./images/home.jpg)
![](./images/bar_spacer.gif)
Détail de l'auteur
Auteur Mireia Cobos |
Documents disponibles écrits par cet auteur
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
![](./images/orderby_az.gif)
Determination of hexavalent chromium in leather by ion-exchange chromatography / Joaquim Font in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)
![]()
[article]
Titre : Determination of hexavalent chromium in leather by ion-exchange chromatography Type de document : texte imprimé Auteurs : Joaquim Font, Auteur ; Carme Pérez, Auteur ; Maria R. Reyes, Auteur ; Mireia Cobos, Auteur ; Felipe Combalia, Auteur ; Agusti Marsal, Auteur Année de publication : 2014 Article en page(s) : p. 151-157 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie par échange d'ions
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- AnalyseIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The determination of traces of hexavalent chromium in leather and in leather consumer goods is carried out by ion-exchange chromatography. Samples are extracted at pH7.5-8 with a phosphate buffer, according to the method of the current ISO 17075 Standard. The extracts are filtered and analysed by HPLC using an ion-exchange stationary phase and a PDA detector, without any clean up process. An ammonium sulphate electrolyte at pH8 is used as mobile phase. The determination of the recovery yields rates from 84 to 108%. The HPLC method is compared with the current ISO 17075 Standard, which is based in the classical method of the diphenylcarbazide. The data from these results, and from those of recovery rate studies, leads us to conclude that the HPLC method is a better alternative for determining chromium (VI) in leather samples. The new method shortens the procedure of the current ISO 17075 Standard, diminishes workload, reduces the amount of laboratory wastes and its results are much more precise. HPLC is able to measure the chromium (VI) concentration of samples up to 3mg/kg, the detection limit of the current Standard. Note de contenu : - RESULTS AND DISCUSSION : Linearity of the chromatographic method - Selectivity of the chromatographic method - Influence of mobile phase concentration - Time stability of the mobile phase - Limit of detection
- ANALYSIS OF LEATHER SAMPLES : Comparison of precision and recovery rate of the results of both methodsEn ligne : https://drive.google.com/file/d/1u5n2r88RiXLbK1mf0sbelyzG2opknywl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21814
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 151-157[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16445 - Périodique Bibliothèque principale Documentaires Disponible Study of the effect of temperature, relative humidity and UV radiation on wet-white leather ageing / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)
![]()
[article]
Titre : Study of the effect of temperature, relative humidity and UV radiation on wet-white leather ageing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Mireia Cobos, Auteur ; Joaquim Font, Auteur ; Joan Jorge, Auteur ; Lluis Ollé, Auteur Année de publication : 2010 Article en page(s) : p. 334-341 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since upholstery leather is considered a very high-tech product, a long service life is expected by the costumer. However, this type of leather can undergo extreme environmental conditions that may cause premature ageing. This work deals with the study of the effect of temperature, relative humidity, and UV radiation on leather ageing. Leathers with wet-white tannage were exposed to weathering effects using a climatic chamber in order to identify the most important variables affecting this weathering process and to check for interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) have been employed as statistical tools for estimating the effects of the parameters. En ligne : https://drive.google.com/file/d/1nrfajfQj0WFqM3UJji2BHKv9aaNpTX6D/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10517
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 10 (10/2010) . - p. 334-341[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 012504 - Périodique Bibliothèque principale Documentaires Disponible