Investigation into the hazards of finished Cr-tanned leather as both product and waste / Liangqiong Peng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 1 (01-02/2019) . - p. 43-48 Titre : Investigation into the hazards of finished Cr-tanned leather as both product and waste Type de document : texte imprimé Auteurs : Liangqiong Peng, Auteur ; Yue Li, Auteur ; Weimo Han, Auteur ; Wenjun Long, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chrome Chrome hexavalent -- Toxicologie Cuir -- Déchets Produits de lixiviation Substances dangereuses Tests de toxicité Toxicologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, the hazardous, substances in finished chrome-tanned leather and in leachates were determined and evaluated based on ISO or national standards, and the overall toxicity toward Photobacterium phosphoreum of the leachates was assessed. No restricted hazardous substances, such as Cr(VI), Hel-40 and carcinogenic dyes in leathers exceeded the thresholds proposed in the criteria for eco-label leather products. Chrome leathers were then leached with deionized water with a solid/liquid ratio of 1:20 to simulate rainwater leaching, and the heavy metals as well as organic compounds in leachates were analysed by ICP-OES, spectrophotometry, and GC-MS. The total chrome, Cr(VI) and TOC in the leachates of leathers were about 2.6-2.8, 0 and 237-277mg/L, repectively, and the low contents of hazardous substances in leachates showed that leather should net be considered as toxic waste when discarded. However, the biotoxicity assays of the leachates from leathers showed quite a high luminescence inhibition rate of about 97-98%, suggesting a hazard to aquatic organisms. Though the leachable chrome showed the greatest concentration in general, the toxicity of leachates seems complicated and further studies are needed. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Hazardous substances in leather - Leaching test - Toxicological assays - RESULTS AND DISCUSSION : Hazardous substances in leather - The characterisation of the leachates - The biotoxicity of leachates to photobacterium phosphoreum En ligne : https://drive.google.com/file/d/133EXsCaE5xJbzgJAphoFkiwhdmagqdMi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31792 [article]

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Long-term releasing kinetics of chromium from leather / Wenjun Long in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 12 (12/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 12 (12/2021) . - p. 435-441 Titre : Long-term releasing kinetics of chromium from leather Type de document : texte imprimé Auteurs : Wenjun Long, Auteur ; Liangqiong Peng, Auteur ; Xiaofeng Jiang, Auteur ; Faming He, Auteur ; Whenhua Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 435-441 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés organiques Cuir -- teneur en chrome Cuirs et peaux -- Analyse Lixiviation Température Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The release of chromium from leather inevitably results in potential risks and this study is conducted to investigate the long-term releasing behavior. The leaching tests proceed using water at solid to liquid ratio of 1:20 and rotational speed 60 r/min for 240 hours to simulate the release of chrome leather under natural conditions. The experimental data successfully fit with the Pseudo-second-order equation, Elovich equation, and Weber-Morris model, indicating the long-term leaching behavior of chromium in heterogeneous leather is controlled by liquid-solid film, while the interparticle and intraparticle diffusion also play important roles. The leachable chromium accounts for 2.8-4.5% total chromium in leather and increases with temperature. The Three-compartment model depicts the releasing process as rapid, slow, and very slow stages, and temperature mainly affected the very slow stage. The amount of released chromium in rapid and slow stages slightly increases with temperature, which could be used to assess the hazard of chrome leather. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Experimental method. Leaching experiment - Chromium analysis - The organics released - Scanning electron microscope and differential. Scanning calorimetry - Nitrogen adsorption analysis - RESULT AND DISCUSSION : Chromium released from leather at various temperatures - Kinetics analysis for Cr release - Elovich equation - The pseudo-second-order rate equation - Three-compartment model - Table 1 : Coefficients of determination (R2) for the kinetic models of chromium leaching from leather - Table 2 : The parameters of three-compartment model DOI : https://doi.org/10.34314/jalca.v116i12.4688 En ligne : https://drive.google.com/file/d/1AbRu_t61-UoxZ8fp8hu_K5vf47sLV_an/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36783 [article]

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