Chromium(VI) extracted from leather using acid and alkaline artificial perspiration / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 193-196 Titre : Chromium(VI) extracted from leather using acid and alkaline artificial perspiration Type de document : texte imprimé Auteurs : Dai Hong, Auteur ; An Xun, Auteur ; Zhang Zongcai, Auteur Année de publication : 2009 Article en page(s) : p. 193-196 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As we know, when leather and its products are used in contact with skin, perspiration may dissolve components from the leather and this may include Cr(VI) so, using artificial perspiration to extract chromium (VI) in leather is of significance. Determination of chromium(VI) in leather using extraction with pH5.5 and 8.0 artificial perspiration solution and subsequent determination with DPC photometric method has been studied. The linearity, repeatability and recovery percentage were tested to evaluate the determination methods. The results show that the experimental methods have good linearity, feasibility and reliability. The result also illustrate that less chromium(VI) is extracted from leather with pH5.5 artificial perspiration solution than with pH8.0 alkaline artificial perspiration solution. En ligne : https://drive.google.com/file/d/1Wg24MAwKyqSwq_Uqso4GswqrBrC1uKJP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6279 [article]

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Determination of Cr(VI) content in leather with anodic stripping voltammetric polarography / Zhu Zhengxin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 6 (11-12/2011)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 6 (11-12/2011) . - p. 255-258 Titre : Determination of Cr(VI) content in leather with anodic stripping voltammetric polarography Type de document : texte imprimé Auteurs : Zhu Zhengxin, Auteur ; An Xun, Auteur ; Zhang Zongcai, Auteur ; Dai Hong, Auteur Année de publication : 2011 Article en page(s) : p. 255-258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Micro-ondes Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Voltampérométrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An anodic stripping voltammetric method has been developed for determination of Cr(VI) content in leather treated with nitric acid-hydrogen peroxide microwave digestion. Microwave digestion was used in sample preparation for its fast digestion, lower reagent consumption and safe operation. The sample solution was mixed with DTPA (diethylenetriaminepentaacetic acid)-sodium acetate-sodium nitrate buffer solution, and then it was purged with oxigen free nitrogen for 300 seconds before deposition of the metals was carried out by applying a constant potential versus Ag/AgCl to the hanging mercury drop electrode (HMDE) for 60 seconds. A standard addition procedure was used for quantification. The repeatability and recovery percentage were tested to evaluate the determination methods. The results showed that Cr(VI) content in leather sample determined was 0.68mG/kG. Relative standard deviations for 8 replicate determinations of µg/L Cr(VI) standard solution and leather samples were carried out and the precision test results were 1.338 and 7.47 % respectively. recovery percentage was in the range from 97.22 % to 106.58 %. The proposed method is simple, convenient, sensitive and reliable. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Chemical reagents and materials - Ready-to-use solutions - Sample preparation - Voltammetric analytical procedure - RESULTS AND DISCUSSION : Effect of operational parameters - Tests of Cr(VI) leather samples En ligne : https://drive.google.com/file/d/1rDu2ynaD5pxZdS-c5sDwWDOAx0nfDpwd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12880 [article]

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