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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