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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Synthesis of biological based anionic fatliquor and its application on leather / Muhammad Kashif Pervez in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 10 (10/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 10 (10/2015) . - p. 326-331 Titre : Synthesis of biological based anionic fatliquor and its application on leather Type de document : texte imprimé Auteurs : Muhammad Kashif Pervez, Auteur ; F. Ahmed, Auteur ; Sarwat Jahan Mahboob, Auteur ; Rajkumar Dewani, Auteur ; H. R. Nawaz, Auteur ; M. Zeeshan, Auteur ; T. Ayaz, Auteur Année de publication : 2015 Article en page(s) : p. 326-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Cuirs et peaux -- Propriétés physiques Huile de colza Huile de ricin et constituants Huiles et graisses végétales Mélange Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, three types of anionic fat liquors are prepared from various vegetable oils by sulfation process. One fatliquor is made from pure canola oil, the second one from castor oil and the third one is made from a mixture of different oils, which is termed here as ‘Blended oil’. Canola oil is used for fat-liquoring purpose and has been compared with other natural oil based fat-liquors and a commercially available sulfated fat-liquor. Different chemical and physical studies were carried out to find out the fat-liquor producing the best results. Chemical studies of fat-liquor such as pH, fat content, solid content, moisture and organically combined sulfuric anhydride were determined before its application on leather. The physical studies such as tear strength, tensile strength, elongation, burst load, softness and distention were carried out on crust leather. The fat content test was carried out to check the uptake of fat-liquors by leather samples. On the basis of chemical and physical analysis the blended oil based fat liquor was found to be better than the castor & canola oil based fatliquors and commercially available sulfated fat-liquor. Note de contenu : - EXPERIMENTAL : Sulfatation - Fat-liquoring - Chemical testing of fat-liquor - Physical testing of fat-liquored leather - RESULTS AND DISCUSSION : Chemical analysis of fat-liquor - Physical analysis of fat-liquored leather En ligne : https://drive.google.com/file/d/16lDrYiVmdK5WSJl7GZjD_uoDFcqQPP4H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24743 [article]

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