Proficiency testing for determination of hexavalent chromium in leather in China / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 2 (03-04/2020) . - p. 59-62 Titre : Proficiency testing for determination of hexavalent chromium in leather in China Type de document : texte imprimé Auteurs : Zhiding Huang, Auteur ; Yang Zhao, Auteur ; Wei Wang, Auteur ; Wang Peng, Auteur ; Xinying Zhao, Auteur ; Hongyue Shi, Auteur ; Wenkai Chang, Auteur Année de publication : 2020 Article en page(s) : p. 59-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assurance qualité Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Cuirs et peaux -- Industrie -- Chine Evaluation Statistiques Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A proficiency testing scheme (CNAS PT0038-PT-201802) for the determination of hexavalent chromium in leather was organised in China. The test materials were prepared by adding a tanning agent containing hexavalent chromium to a blank sheepskin during the retanning process. The retanning was identical to the real production process to assure the representation of the test materials. Homogeneity and stability indicated that the test materials were suitable for the proficiency testing samples. The assigned values of test materials for proficiency assessment were derived directly front the reported results of laboratories, and the measurement performance for determining hexavalent chromium in leather were assessed using robust z-scores. This PT program is necessary and useful to help the laboratories to comply with quality assurance requirements and improve the detection level. Note de contenu : - EXPERIMENTAL PROCEDURES : Participating laboratories - Preparation of test materials - Homogeneity and stability - Performance statistics - RESULTS AND DISCUSSIONS : Homogeneity of test materials - Stability of test materials - Histograms of results - Assigned values - Evaluation of laboratory proficiency - Assessment En ligne : https://drive.google.com/file/d/1TYp7e47qIsxjjX8DfbHK8HRd2K9KS_k7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33909 [article]

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Progress of certified reference materials in the leather field / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 2 (03-04/2019) . - p. 59-64 Titre : Progress of certified reference materials in the leather field Type de document : texte imprimé Auteurs : Zhiding Huang, Auteur ; Yang Zhao, Auteur ; Xinying Zhao, Auteur ; Wei Wang, Auteur ; Xugen Feng, Auteur ; Wenkai Chang, Auteur Année de publication : 2019 Article en page(s) : p. 59-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Certification Chaussures Cuirs et peaux -- Industrie Matériaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Certified reference materials in the leather industry are mainly used for testing of physical, mechanical and chemical safety properties of leather, footwear products and shoe materials. Certified reference materials are an important basis for ensuring the accuracy, reliability and traceability of the test resuits. In this paper, the progress of certified reference materials in leather industry at home and abroad was systematically reviewed, and the main research methods of certified reference materials in leather field are described. At the same time, the existing problems of the certified reerence materials in leather industry were analysed. Finally, the prospects of the development and application of certified reference materials in leather industry were put forward. Note de contenu : - RESEARCH STATUS OF CRMS IN THE LEATHER INDUSTRY : CRMs in the leather industry - Development of CRMs in the leather field - PROBLEMS OF CRMS IN THE LEATHER FIELD - Table 1 : Summary of CRMs in the leather industry - Table 2 : Summary of certification methods of CRM in the leather field - Fig. 1 : Route chart of development of a CRM - Fig. 2 : Development of CRM for longitudinal stiffness of shanks for footwear - Fig. 3 : Development of CRM for abrasion resistance of footwear - Fig. 4 : Route chart of development of CRM for chemical properties of leather En ligne : https://drive.google.com/file/d/15i2Fd3JIXPoXUofxrHYajw4TUNgMqQqJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32301 [article]

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