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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. XCVII, N° 7Mention de date : 07/2002Paru le : 15/07/2002 |
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Ajouter le résultat dans votre panierRemoval of methylene blue from aqueous solutions by adsorption on tanned solid wastes / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
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Titre : Removal of methylene blue from aqueous solutions by adsorption on tanned solid wastes Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; J. Mabrour, Auteur ; S. Alami. Younssi, Auteur ; M. Bouhria, Auteur ; A. Albizane, Auteur ; A. Messaoudi, Auteur ; M. Azzi, Auteur Année de publication : 2002 Article en page(s) : p. 261-266 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The removal of methylene blue (MB) from aqueous solutions by adsorption on tanned solid wastes was studied in a static batch reactor. The buffing dust sample proved to be a better adsorbent than chrome shavings. pH has anobvious influence on the adsorption of methylene blue onto buffing dust: under acidic conditions (pH<4.5) and at high pH values (pH>10.5), adsorption is less favourable. Four hours of adsorption was chosen as equilibrium time. The maximum adsorption capacity is about 84 mg of methylene blue for each gram of buffing dust. En ligne : https://drive.google.com/file/d/1MsOi0U1VFGuurYTWebuxEfFxTVaoCRnB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4286
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 261-266[article]Réservation
Réserver ce documentDevelopment of natural colors in Cr-Fe tanned upper leathers / Jonnalagadda Raghava Rao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
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Titre : Development of natural colors in Cr-Fe tanned upper leathers Type de document : texte imprimé Auteurs : Jonnalagadda Raghava Rao, Auteur ; C. Prabhakar, Auteur ; R. Rajapandian, Auteur ; Palanisamy Thanikaivelan, Auteur ; J. Malathi, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2002 Article en page(s) : p. 267-283 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dyes based on synthetic formulations are being widely used in the leather industry. However, it is known that many aryl amine dyes are banned due to their carcinogenic nature. Environmental concern leads one to look for dye products based on natural resources, which have several advantages like biodegradability, less toxicity, etc. The basis of this approach is to achieve an eco-friendly dyeing process with the use of iron salts, which give rise to various colors on reacting with vegetable tannins. Goatskins have been tanned with Cr-Fe tanning salt and striked with different vegetable tanning materials like wattle, chestnut, myrobalan and quebracho at various concentrations. Colors like brown, bluish black, deep black and grey shades have been developed. The color shades obtained have been quantified by reflectance measurements and compared with the visual assessment data. The strength and bulk properties are not significantly altered by increasing the concentration of various vegetable tannins from 1 to 5%. However, treatment with 5% wattle decreases the strength properties of the leathers appreciably due to its heavy filling nature coupled with prior filling using co-filling syntans. En ligne : https://drive.google.com/file/d/1V2CEzpPOP0NqfSdqEwjsHzy5U6UKp9Bf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4287
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 267-283[article]Réservation
Réserver ce documentEffects of fatliquor on vacuum drying of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
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Titre : Effects of fatliquor on vacuum drying of leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur ; Gary L. Di Maio, Auteur Année de publication : 2002 Article en page(s) : p. 285-295 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of fatliquor was not included in our previous vacuum drying studies for chrome-tanned leather. Therefore, a follow-up vacuum drying study was performed to evaluate the effect of fatliquor. By using the SAS statistical program, we have formulated the relationship between fatliquor concentration and drying rate. This study also focused on how fatliquor affects the strength, elongation, stiffness and toughness of the vacuum dried leather. A second order polynomial regression equation was derived to plot 3-D response surfaces that clearly illustrate the relationship between the fatliquor concentration and drying rate, as well as the resultant physical properties. Measurements showed the drying rate decreases as the fatliquor concentration increases by a factor of (1-f)1/2, where f is the fatliquor concentration fraction. Observation showed that the tensile strength, elongation, and toughness all increase steadily with an increased fatliquor concentration, whereas the Young's modulus decreased. A correlation was observed between elongation and Young's modulus. En ligne : https://drive.google.com/file/d/18IctzfqoFihfXZic7gwXW3Wx4OmAbMj0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4288
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 285-295[article]Réservation
Réserver ce documentInter-laboratory study on hexavalent chromium determination in dyed skins / T. Rius in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
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Titre : Inter-laboratory study on hexavalent chromium determination in dyed skins Type de document : texte imprimé Auteurs : T. Rius, Auteur ; Joaquim Font, Auteur ; Rosa M. Cuadros, Auteur ; Sara Cuadros, Auteur ; M. Santiago, Auteur ; E. Verdù, Auteur ; Agusti Marsal, Auteur Année de publication : 2002 Article en page(s) : p. 277-283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent
Cuir teint
Cuirs et peaux -- AnalyseIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this work is to implement a new method for the determination of the chromium (VI) content in dyed leather. A collaborative study was carried out by four Spanish laboratories to test the method, which analyses the chromium (VI) content in the extracted solutions from leather under predetermined conditions.
The well-known IUC 18 method shows deficiencies when applied to coloured leather. Thus, the new method is a modification of that. The new procedure is described in the WI 00289055 European Draft Standard, and it was developed by the CEN/TC 289 Committee. In the new method, the leather extract is decoloured by solid phase extraction in order to eliminate all the coloured substances that may interfere in the spectrophotometric detection of chromium (VI). Two commercial C18 solid phase extraction cartridges were also compared in the present study. The method was validated by applying the part 2 of the ISO 5725 Standard ("Basic method for the determination of repeatability and reproducibility of a standard measurement method") to the results obtained.
The implementation of the new method was successful given that it obviated the need for expensive instruments and produced results that were more robust and reproducible than those achieved with the existing standard method.Note de contenu : - INTRODUCTION : Aim of the work - New analytical method for the chromium (VI) content determination in dyed skins
- EXPERIMENTAL : Inter-laboratory study - Validation of the method. Application of the ISO 5725 standard - Comparison of two commercial cartridges
- RESULTS AND DISCUSSION : Chromium (VI) content determined in the inter-laboratory study - Data analysis. Application of the ISO 5725 standard for the validation of the method - Compariçson of two commercial cartridges
- Table 1 : Results from 5 analyses for Cr(VI) in each skin
- Table 2 : Averages and statistical characteristics of the results
- Table 3 : Form C : Absolute differences within cells
- Table 4 : Results of the anlaysis using DIONEX cartridges
- Table 5 : Results of the analysis using WATERS cartridges
- Table 6 : Comparison of absorbance values obtained on solutions decouloured with commercial cartridgesEn ligne : https://drive.google.com/file/d/1aFoSEl0e2kMK37JT9XcfwLEKVC3-HuWy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39789
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 277-283[article]Réservation
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