Inter-laboratory study on formaldehyde determination by HPLC / Joaquim Font in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (02/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (02/2008) . - p. 53 - 61 Titre : Inter-laboratory study on formaldehyde determination by HPLC Type de document : texte imprimé Auteurs : Joaquim Font, Auteur ; Agusti Marsal, Auteur ; Sara Cuadros, Auteur ; M. A. Juàrez, Auteur ; E. Verdù, Auteur ; M. Jorba, Auteur ; M. Reyes, Auteur ; T. Rius, Auteur ; S. Viera, Auteur Année de publication : 2008 Article en page(s) : p. 53 - 61 Note générale : Bibliogr. Langues : Américain (ame) Résumé : The colorimetric determination of formaldehyde in a water extract of a leather sample is a procedure that has been criticized because of possible interferences of other aldehydes and coloured substances that could interfere in the spectrophotometric detection. The measurement by liquid chromatography HPLC is an alternative method that was developed some years ago. This method is more sophisticated but more selective and free of the aforementioned interferences. It is not sensitive to coloured extracts. With the implementation of HPLC equipment in many laboratories, this choice has become feasible in our sector. The process is selective. Formaldehyde is separated and quantified as a derivative from other aldehydes and ketones by liquid chromatography. The free-formaldehyde and formaldehyde which is hydrolysed during extraction to yield free-formaldehyde are detected by this method. The sample is eluted with water at 40°C. The eluate is mixed with 2,4 dinitrophenylhydrazine, whereby aldehydes and ketones react to yield the respective hydrazones. These are separated by means of a reversed-phase HPLC method, detected at 350 nm and quantified. The aim of this work is to present a collaborative inter-laboratory study coordinated by the Igualada Leather Technology School and carried out with four other laboratories that had previously implemented the HPLC method or that were planning to do this. Determination of formaldehyde content in leather was carried out in each laboratory in accordance with prEN ISO 17226:2005 - HPLC Standard, developed by the Committee CEN/TC 289. Part 2 of the ISO 5725 Standard (Basic method for the determination of repeatability and reproducibility of a standard measurement method) was applied to examine the results. The study proved successful. The HPLC method achieved very reproducible results between laboratories. This work has also demonstrated that other aldehydes, glutaraldehyde included, do not interfere in the chromatographic method. The use of a PDA detector increases the confidence of the detection of formaldehyde in leather samples. En ligne : https://drive.google.com/file/d/1E16gTqYgL-Wrer6A0lzBSboae2jF1S61/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2572 [article]

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Inter-laboratory study on hexavalent chromium determination in dyed skins / T. Rius in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 277-283 Titre : Inter-laboratory study on hexavalent chromium determination in dyed skins Type de document : texte imprimé Auteurs : T. Rius, Auteur ; Joaquim Font, Auteur ; Rosa M. Cuadros, Auteur ; Sara Cuadros, Auteur ; M. Santiago, Auteur ; E. Verdù, Auteur ; Agusti Marsal, Auteur Année de publication : 2002 Article en page(s) : p. 277-283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuir teint Cuirs et peaux -- Analyse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this work is to implement a new method for the determination of the chromium (VI) content in dyed leather. A collaborative study was carried out by four Spanish laboratories to test the method, which analyses the chromium (VI) content in the extracted solutions from leather under predetermined conditions. The well-known IUC 18 method shows deficiencies when applied to coloured leather. Thus, the new method is a modification of that. The new procedure is described in the WI 00289055 European Draft Standard, and it was developed by the CEN/TC 289 Committee. In the new method, the leather extract is decoloured by solid phase extraction in order to eliminate all the coloured substances that may interfere in the spectrophotometric detection of chromium (VI). Two commercial C18 solid phase extraction cartridges were also compared in the present study. The method was validated by applying the part 2 of the ISO 5725 Standard ("Basic method for the determination of repeatability and reproducibility of a standard measurement method") to the results obtained. The implementation of the new method was successful given that it obviated the need for expensive instruments and produced results that were more robust and reproducible than those achieved with the existing standard method. Note de contenu : - INTRODUCTION : Aim of the work - New analytical method for the chromium (VI) content determination in dyed skins - EXPERIMENTAL : Inter-laboratory study - Validation of the method. Application of the ISO 5725 standard - Comparison of two commercial cartridges - RESULTS AND DISCUSSION : Chromium (VI) content determined in the inter-laboratory study - Data analysis. Application of the ISO 5725 standard for the validation of the method - Compariçson of two commercial cartridges - Table 1 : Results from 5 analyses for Cr(VI) in each skin - Table 2 : Averages and statistical characteristics of the results - Table 3 : Form C : Absolute differences within cells - Table 4 : Results of the anlaysis using DIONEX cartridges - Table 5 : Results of the analysis using WATERS cartridges - Table 6 : Comparison of absorbance values obtained on solutions decouloured with commercial cartridges En ligne : https://drive.google.com/file/d/1aFoSEl0e2kMK37JT9XcfwLEKVC3-HuWy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39789 [article]

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