Correlating process parameters with hexavalent chromium level in leather / Dipankar Chaudhuri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 12 (12/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 12 (12/2001) . - p. 461-466 Titre : Correlating process parameters with hexavalent chromium level in leather Type de document : texte imprimé Auteurs : Dipankar Chaudhuri, Auteur ; Sanjib Mondal, Auteur Année de publication : 2001 Article en page(s) : p. 461-466 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Three important process parameters, namely, degree of neutralization, intensity of acidification towards the end of fatliquoring, and the degree of exposure to sunlight during drying have been studied to assess their influence on the Cr(VI) level detected in leather. Wet-blue cow-hide pieces have therefore been neutralized to different extent by using sodium bicarbonate, fatliquored, and acidified to different pH values ranging from 3.5 to 7.3, and dried under varying conditions. While some of the leather pieces have been dried in direct sunlight, others have been dried either in diffuse sunlight or in the dark. The Cr(VI) levels in all these leathers have been determined spectrophotometrically. The results clearly indicate that all three parameters studied here strongly influence the Cr(VI) level detected in leather. En ligne : https://drive.google.com/file/d/1B9d64tVAOntZN9ZbXl1Yo-QVGcuIsmJJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4345 [article]

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How much Cr(VI) is formed during extraction of leather with phospahte buffer ? / Dipankar Chaudhuri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 119-128 Titre : How much Cr(VI) is formed during extraction of leather with phospahte buffer ? Type de document : texte imprimé Auteurs : Dipankar Chaudhuri, Auteur ; Ratna Chakraborti, Auteur ; Pinaki Bhattacharya, Auteur Année de publication : 2004 Article en page(s) : p. 119-128 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hexavalent chromium is not used at any stage of leather processing and leather possesses a reducing property. Therefore, hexavalent chromium is not likely to be present in leather. Nevertheless, Cr(VI) has been reported to be present. At the moment it is not clear whether the positive test results are indeed the consequence of hexavalent chromium extraction from leather or not. Despite this, Cr(VI) formation during extraction has been suggested as a probable reason for most of the positive test results. In the present investigation, leather analyses were carried out using different buffer solutions and also the same buffer solution at different pH values. Analysis for Cr(VI) was carried out under simulated extraction conditions also. The results of all these experiments indicate that the amount of Cr(VI) formed during extraction is too little to be considered as an important reason behind testing that yields positive findings of Cr(VI). En ligne : https://drive.google.com/file/d/1DJ0JaI4niISgvsrnE-Mn2FecHlJVf7P2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4186 [article]

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