Separation, speciation and quantification of both chromium (VI) and chromium (III) in tanned leather samples : a comparative study and validation of analytical methods / Mónica Gisel Arellano-Sánchez in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 16 p. Titre : Separation, speciation and quantification of both chromium (VI) and chromium (III) in tanned leather samples : a comparative study and validation of analytical methods Type de document : texte imprimé Auteurs : Mónica Gisel Arellano-Sánchez, Auteur ; Juliette Vievard, Auteur ; Lamia Moufarrej, Auteur ; Christine Devouge-Boyer, Auteur ; Marie Hubert-Roux, Auteur ; Carlos Afonso, Auteur ; Mélanie Mignot, Auteur Année de publication : 2023 Article en page(s) : 16 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Chromatographie par échange d'ions Chrome hexavalent Chrome trivalent Cuirs et peaux -- Analyse Spéciation (chimie) Spectrométrie de masse Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present work, a comparative study of analytical methods for the simultaneous and quantitative determination of trivalent and hexavalent chromium is presented. For the analysis by ion chromatography-inductively coupled plasma-mass spectrometry, two different columns were tested, as well as different mobile phases and different pH of the samples. The optimized analytical method permitted the separation of Cr(III) and Cr(VI) using 75 mmol/L NH4NO3 pH 3 as chromatographic eluent. The method was validated and applied to real samples, allowing the determination of both species simultaneously, even when there is a huge difference of concentration between Cr(III) and Cr(VI). Limit of detection and limit of quantification for Cr(III) were found to be 0.016 and 0.054 μg/L (0.3 and 1.1 μg/kg), respectively, and for Cr(VI) 0.13 and 0.43 μg/L (7 and 22 μg/kg), respectively. Possible species interconversions were monitored through the use of chromium isotopic standards, which confirmed that the optimized methodology preserves chromium speciation during extraction and analysis. Fourier-transform ion cyclotron resonance-mass spectrometry permitted the structure elucidation of the complex formed during ethylenediaminetetraacetic acid extraction. Note de contenu : - EXPERIMENTAL : Instrumentation - Materials - Methodology - RESULTS AND DISCUSSION : Speciation by IC-ICP-MS - FTICR MS - Validation - Table 1 : Optimized operating conditions for ICP-MS - Table 2 : FTICR parameters for the analysis of the chromium-EDTA complex - Table 3 : Retention times of the different peaks observed after injecting Cr(III)-EDTA− at different pH - Table 4 : Chromatographic conditions of the study by Hernandez et al. [19] versus conditions of the current study - Table 5 : Retention times of Cr species observed at different sample conditions (pH and redox potential) - Table 6 : Ion formula predicition - Table 7 : Interday precision for Cr(III) determination. 3 different samples were analyzed each day - Table 8 : Cr(VI) determination from a leather sample DOI : https://doi.org/10.1186/s42825-023-00125-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00125-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40068 [article]

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