Quantifying uncertainty for the determination of formaldehyde in leather by colorimetric method / Rajkumar Dewani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 11 (11/2012) . - p. 384-393 Titre : Quantifying uncertainty for the determination of formaldehyde in leather by colorimetric method Type de document : texte imprimé Auteurs : Rajkumar Dewani, Auteur ; Farman Ahmed, Auteur ; Muhammad Saleemuddin, Auteur ; Munawwer Rasheed, Auteur ; Muhammad Kashif Pervez, Auteur ; Sarwat Jahan Mahboob, Auteur Année de publication : 2012 Article en page(s) : p. 384-393 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorimétrie Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Dichromate de potassium Etalonnage Incertitude de mesure Volumétrie (chimie analytique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The uncertainty in the analysis of formaldehyde in leather by colorimetric method was investigated and estimated according to ISO 17025 requirements. A total of sixteen various components contributing to the uncertainty of analysis result were identified and quantified, with separate uncertainty budgets. Among them, seven were related to volumetric measurements whereas the other nine were non volumetric. The study suggests that repeatability holds the largest uncertainty followed by formaldehyde recovery and standard calibration curve, while molecular weight and purity of potassium dichromate held the lowest uncertainty. Under carefully controlled experimental conditions the expanded uncertainty of the result is found to be plus or minus 0.676 mg/kg for a mass fraction of 30.73 mg/kg of formaldehyde in leather. Furthermore, the affect of uncertainty contribution from standard calibration curve and extraction temperature on the expanded uncertainty is explored to formulate valid suggestions for regulating the combined standard uncertainty. Note de contenu : - ANALYTICAL PROCEDURE : Definitionof the measurand - Identification of uncertainty sources - Non-volumetric sources - Volumetric sources - EXPERIMENTAL : Standards and reagents - Calibration - Application example - Bias study - Additional aspects En ligne : https://drive.google.com/file/d/15iGpLQCQ9w7qg3bDE8W7K_JS1y4V6IsK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16522 [article]

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