Comparison of IUP 16 ad microscopic hot table methods for shrinkage temperature determination / Joaquim Font in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 2 (03-04/2010) . - p. 59-64 Titre : Comparison of IUP 16 ad microscopic hot table methods for shrinkage temperature determination Type de document : texte imprimé Auteurs : Joaquim Font, Auteur ; Jenifer Espejo, Auteur ; Sara Cuadros, Auteur ; Maria R. Reyes, Auteur ; Anna Bacardit, Auteur ; Salvador Buti, Auteur Année de publication : 2010 Article en page(s) : p. 59-64 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, shrinkage temperature (Ts) is determined by the IUP 16 method. However, only microanalytical techniques like the Microscopic Hot Table (MHT) method are appropriate for the Ts of leather objects of historical value. No more than 0.1-0.4 mg of samble is needed for the test. The precision and accuracy of the MHT method were investigated taking the official IUP 16 method as a reference. It was concluded that the Ts determined by both methods are in good agreement. The MHT method is precise ans sensitive enough to state that small changes of 1.3°C detected in Ts are stastistically significant. The method was successfully applied to determine the Ts of several artefacts of the Leather Museum of Igualada. En ligne : https://drive.google.com/file/d/1n1urunA0TgjRiiiPsTqyX6S9J1SsCr3v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9181 [article]

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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]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 151-157 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 -- Analyse Index. 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 methods En ligne : https://drive.google.com/file/d/1u5n2r88RiXLbK1mf0sbelyzG2opknywl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21814 [article]

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