Objective review : Advanced testing and toxicity of restricted substances for sustainable leather industry / Rajkumar Dewani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 3 (03/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 3 (03/2023) . - p. 117-128 Titre : Objective review : Advanced testing and toxicity of restricted substances for sustainable leather industry Type de document : texte imprimé Auteurs : Rajkumar Dewani, Auteur ; Muhammad Kashif Pervez, Auteur ; Sarwat Jahan Mahboob, Auteur ; Tahira Ayaz, Auteur ; Sikander Ali Soomro, Auteur Année de publication : 2023 Article en page(s) : p. 117-128 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie industrielle -- Législation Cuirs et peaux -- Industrie Cuirs et peaux -- Produits chimiques Produits chimiques -- Toxicologie Règlements de sécurité Tests de toxicité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather industry uses a great number of processing chemicals to make leather from animal hides. The toxicity, health and environmental impacts of many of these chemicals have been established leading to significant regulatory certifications and programs helping in trade and policy making. The focus of this review are the hazardous chemicals and auxiliaries relevant to leather industry, their categories, possible origins, analysis and toxicity with respect to humans and the environment and the regulatory mechanisms suggested for them through manufacturing restricted substance list (MRSL) 2.0.** Informative guidelines are provided about the most probable leather processing stage for the origin of these chemicals. Some alternative technologies, chemicals and ideas gaining popularity are also suggested as probable remedies. Recommended test methods are stated for the adequate monitoring of the hazardous chemicals. The nature and severity of chemical toxicity and corresponding limits set for their allowed use in formulations are graphically expressed for clarity and ease of understanding. The maximum number of compounds / isomers belong to classes comprising chlorinated paraffins, perfluorooctanoic acids (PFOA), perfluorooctanesulfonates (PFOS) and banned aromatic amines. Similarly, most of the restricted chemicals are used during the finishing stage and may be considered for eco-friendly alternatives. Likewise, the analytical equipment covering most testing requirements is GC-MS among other hyphenated techniques. Additionally, most critical chemicals from toxicity point of view are arsenic, cadmium and chromium (VI), whereas navy blue colorants and chlorinated aromatic compounds may be considered as less toxic among the restricted chemicals under the current scope. Surprisingly, the latest UV absorbents and polymeric fatliquors are comparatively non-toxic. Similarly, the most relaxed formulation limits are given for UV absorbers and 2-methoxypropylacetate whereas strict limits have been set for PFOA, PFOS, mercury, triclosan permethrin, sensitizing dyes etc. in MRSL 2.0. Note de contenu : - INTRODUCTION : Regulatory standards and certifications for leather sector sustainability - ZDHC MRSL 2.0 - Control at process inputs for restricted substances - Alternate processes and chemicals - Analysis recommendations - Toxicity - Prospective compounds - Table 1 : Details of analysis and formulation limits for restricted chemicals relevant to leather - Table 2 : Probable sources of origin for vaious restricted substances in leather - Fig. 1 : Likelihood of MRSL compounds emerging from different leather processing stages - Fig. 2 : Recommended analysis techniques for MRSL (2.0) chemicals and compounds classes DOI : https://doi.org/10.34314/jalca.v118i3.6815 En ligne : https://drive.google.com/file/d/1fbPwXT8PbhpmyvD8sgfA23-CMon1SJvM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39002 [article]

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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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