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675.2 : Préparation du cuir naturel. Tannage |
Ouvrages de la bibliothèque en indexation 675.2
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Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides / Samir Dasgupta in WORLD LEATHER, Vol. 18, N° 7 (11/2005)
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Titre : Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2005 Article en page(s) : p. 17-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning for a long lime enjoyed a unique position amongst tanners all over the world and almost 90% of leather produced is chrome tanned. Of all these benefits, high shrinkage temperature bas been the paramount feature in favour of chrome tanning as this cannot be achieved by any other tanning systems. A number of studies have been published recently suggesting that Chromium(III) itself may be toxic at higher levels under certain ligand environment and Chromium(VI) is a known carcinogen. So, tanners have to consider how best to modify their chrome tanning process for better exhaustion of chrome and look for alternative means to minimise the impact of tanning on the environment. LASRA research has shown that none of the alternatives to chrome free tanning systems are as cost effective and cheap than chrome tanning. The best commercial option is, therefore, to develop an effective chrome management system for the tannery.
Several chrome management technologies have emerged recently. Among the options available is the no pickle ThruBlu process, first introduced for lambskins in 1993 at LASRA Conference by DasGupta and further developed and subsequently extended to split hides tannages. h is is the most cost effective and easily adoptable. But this novel system challenges the basic established theory of chrome tanning and therefore demands conviction from tanners. The partial substitution of chromium with alternative tanning agents like Oxazolidine E (Zolidine E, Angus Chernicals), THPS (Albrite AD, Rhodia) is also promising because this combines benefits of both the tanning materials.
To develop an effective optimum system, a tanner must first find out what is the minimum amount of chrome that is required to satisfy his customer requirements, both in respect of dye ability and other performance requirements. This is a must before subsequent options can be considered, such as :
- Simply recycling the chrome exhaust in pickle
- Precipitate the chrome in the exhaust liquor, then deposit the cake in land fill
- Precipitate the chrome in the exhaust liquor, regenerate as chrome tanning agent for reuse.
This report outlines systems which give an optimum chrome tanning of hides. Further, LASRA ThruBlu process that was originally devised for delimed hides, has been modified for chrome tanning of pickled hides to minimise chrome in exhaust liquors.Note de contenu : - The optimum chrome tannage of hides
- Modification of the Thrublu process : Residual formaldehyde in the modified Thrublu leather
- Panel 1 : 1. Effect of chrome offer on shrinkage temperature of wet blue sides, °C - 2 : Effect of chrome offer on the residual chrome in exhaust liquor - 3 : Layerwise distribution of chrome in side leather
- Panel 2 : 1 : Tear and tensile strength of chrome tanned side leather - 2 : Grain strength of chrome tanned side leather
- Panel 3 : The original LASRA ThruBlu process
- Panel 4 : 1. Effect of tannage on the shrinkage - 2. Layerwise distributionof chrome in leather
- Panel 5 : 1. Tear and tensile strength of chrome side leather - 2. Grain strength of chrome tanned side leather
- Panel 6 : Softness of chrome tanned side leather
- Panel 7 : Formaldehyde content of chrome tanned side leatherEn ligne : https://drive.google.com/file/d/1rfPARWOhJl1od96TFxYmhydX-2k77r0M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32492
in WORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 17-21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006187 - Périodique Bibliothèque principale Documentaires Disponible Overcoming the bisphenol hurdle / Marc Hombeck in INTERNATIONAL LEATHER MAKER (ILM), N° 58 (03-04/2023)
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Titre : Overcoming the bisphenol hurdle Type de document : texte imprimé Auteurs : Marc Hombeck, Auteur ; Heinrich Francke, Auteur Année de publication : 2023 Article en page(s) : p. 48-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisphénols
Chimie industrielle -- Législation -- Pays de l'Union européenne
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuir dans les automobiles
Cuir sans bisphénols
Formulation (Génie chimique)
Produits chimiques -- Toxicologie
Syntans
Wet-white (tannage)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The European Chemical Agency (ECHA) has recently proposed a new regulation for the placing on the market of mixtures and articles containing bisphenols. If the draft is implemented without changes, this will - after various transition times - result in very low limits for these chemicals in leather auxiliaries and leather articles. When it comes to syntans, bisphenols are raw materials and unwanted side products, respectively. State-of-the-art production technologies for syntans might not succeed in lowering bisphenol content to the proposed limits, though. As syntans play an essentiel part in the production of almost all of today's leather articles, the new regulation will lead to a disruptive change in the selection of chemicals in common recipes. Zschimmer & Schwarz has anticipated this issue and presents the first solutions to achieve completely bisphenol-free leather. Note de contenu : - Importance of syntans
- Fig. 1 : Structural comparison of the five bisphenols which are affected by the restriction and their relevance for the leather industry
- Fig. 2 : Possible timeline and limits according to the restriction proposal of ECHA
- Fig. 3a : Simplified reaction pathway towards sulphone-based syntans
- Fig. 3b : Simplified reactionpathway towards phenol-based syntans
- Fig. 4 : Recipe for a bisphenol-free automotive wet-white crust leather
- Fig. 5 : PRoperties of the crust leather produced with the recipe shown in Fig. 4En ligne : https://drive.google.com/file/d/1see9tcfwKjazRZyH4P-plTUASCKpmDOZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39122
in INTERNATIONAL LEATHER MAKER (ILM) > N° 58 (03-04/2023) . - p. 48-50[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23906 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Oxazolidine metal-free leather Type de document : texte imprimé Auteurs : M. Roig, Auteur ; V. Segarra, Auteur ; M. A. Martinez, Auteur ; M. Bertazzo, Auteur ; J. Ferrer, Auteur Année de publication : 2012 Article en page(s) : p. 16-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Oxazolidine
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the traditional tanning process, which is used for over 90 % of leather tanned worldwide, basic trivalent chromium salts are used. However, in some cases, it may cause an allergy to chromium or even, under certain conditions, chromium can change its chemical characteristics, with considerable impact on human health and the environment. In recent years, INESCOP have been looking at oxazolidine, combined with other synthetic or vegetable tanning agents to provide high quality leather for the footwear, upholstery and leather goods industries. In this context, the project titled 'Environmentally-friendly oxazolidine-tanned leather' was launched, which is co-funded by the European Commission in the framework of the LIFE-Environment Programme.
This project, which is coordinated b INESCOP, relied on the participation of an Italian company (CGS) and the Fundacion Communidad Valenciana - Region Europea (FCVRE). In addition, different tanneries and footwear and upholstery manufacturers participated in the project as end users of this technology by carrying out industrial-scale tests and producing different leather articles.En ligne : https://drive.google.com/file/d/1gKdYHNEMiWUnr8pYjiGFHNIbj984GD5I/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15708
in LEATHER INTERNATIONAL > Vol. 214, N° 4823 (08/2012) . - p. 16-20[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14062 - Périodique Bibliothèque principale Documentaires Disponible Oxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 5 (09-10/1977)
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Titre : Oxazolidines - A new class of tanning agents Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 1977 Article en page(s) : p. 97-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Chaleur humide
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuir -- Teneur en chrome trivalent
Cuirs et peaux -- Analyse
Cuirs et peaux de moutons
Oxazolidine
Résistance à la déchirure
Résistance à la traction
Tannage au chrome
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage végétal
TranspirationIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Oxazolidines are heterocyclic derivatives obtained by the reaction of aminohydroxy compounds with aldehydes. The bifunctional behaviour of these oxazolidines is responsible for their cross-linking reactions with phenols and proteins. Two typical oxazolidines, namely 4,4-Dimethyl-1,3-oxazolidine and 1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane have been studied extensively for their use as tanning agents and it has been found that both these oxazolidines react with hide protein and impart special characteristics to leather when tanned in conjunction with syntan, chrome or vegetable tanning materials.
4,4-Dimethyl-1,3-oxazolidine has been found especially suitable for pretanning of greasy pickled sheepskins, subsequently to be degreased with aqueous degreasing systems. Pickled sheepskin even at 3-5 % level of application gives shrinkage temperatures around 70-75°C within an hour of treatment and unlike glutaraldehyde, the pretanned leather remains natural white and so may be finally tanned with syntan or zirconium for white leather.
1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane on the other hand has been found suitable for chrome or vegetable combination tannages of all kinds of leather, especially wool skin tannages where the wool remains spotless white even if the pH of the exhaust chrome liquor moves up to 4.5. Vegetable tanned leather pre-treated with 1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane gives higher degree of tannage, higher shrinkage temperature and about 50 % lower water solubles than conventional tannage. Normal vegetable tanned leather when retanned with about 10 % of 1-Aza-3,7-dioxa-bicyclo-5-ethyl (3,3,0) Octane for an hour gives a shrinkage temperature around 100°c. Fuither, it has been found that the use of oxazolidine affords better utilisation of chrome when used in chrome tanning. The reduced chrome content in the exhaust liquors helps in pollution control.Note de contenu : - EXPERIMENTAL : Effect of initial pH and time - Effect of concentration - Tannage in combination with chrome - Tannage in combination with vegetable tanning materials - Comparison with glutaraldehyde-chrome combination tannages. Oxazoliding I vs. glutaraldehyde on pretannages of skins - Oxazolidine II vs. Glutaraldehyde on chrome tanning of sheepskins - Oxazolidine II vs. glutaraldehyde on vegetable tannage of sheepskins
- Table 1 : Typical properties of oxazolidines
- Table 2 : Chrome content of finished leather
- Table 3 : Tear strength of finished leather
- Table 4 : Tensile strength of finished leather
- Table 5 : Effect of moist heat on leather
- Table 6 : Effect of perspiration solution on leather
- Table 7 : Tensile strength of vegetable tanned crust leather
- Table 8 : Tear strength of vegetable tanned crust leather
- Table 9 : Chemical analysis of vegetable tanned crust leather
- Table 10 : Effect of moist heat on vegetable leather
- Table 11 : Effect of perspiration solution on vegetable tanned leatherEn ligne : https://drive.google.com/file/d/1G6mpUYSZp3ekgWrtLRMORyPSpD2O_avE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34125
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61, N° 5 (09-10/1977) . - p. 97-105[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007114 - Périodique Bibliothèque principale Documentaires Disponible Oxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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Titre : Oxazolidines - A new class of tanning agents Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 1978 Article en page(s) : p. 97-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Chaleur humide
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuir -- Teneur en chrome trivalent
Cuirs et peaux -- Analyse
Cuirs et peaux de moutons
Oxazolidine
Résistance à la déchirure
Résistance à la traction
Tannage au chrome
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage végétal
TranspirationIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Oxazolidines are heterocyclic derivatives obtained by the reaction of aminohydroxy compounds with aldehydes. The bifunctional behaviour of these oxazolidines is responsible for their cross-linking reactions with phenols and proteins. Two typical oxazolidines, namely 4,4-Dimethyl-1,3-oxazolidine and 1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane have been studied extensively for their use as tanning agents and it has been found that both these oxazolidines react with hide protein and impart special characteristics to leather when tanned in conjunction with syntan, chrome or vegetable tanning materials.
4,4-Dimethyl-1,3-oxazolidine has been found especially suitable for pretanning of greasy pickled sheepskins, subsequently to be degreased with aqueous degreasing systems. Pickled sheepskin even at 3-5 % level of application gives shrinkage temperatures around 70-75°C within an hour of treatment and unlike glutaraldehyde, the pretanned leather remains natural white and so may be finally tanned with syntan or zirconium for white leather.
1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane on the other hand has been found suitable for chrome or vegetable combination tannages of all kinds of leather, especially wool skin tannages where the wool remains spotless white even if the pH of the exhaust chrome liquor moves up to 4.5. Vegetable tanned leather pre-treated with 1-Aza-3,7-dioxabicyclo-5-ethyl (3,3,0) Octane gives higher degree of tannage, higher shrinkage temperature and about 50 % lower water solubles than conventional tannage. Normal vegetable tanned leather when retanned with about 10 % of 1-Aza-3,7-dioxa-bicyclo-5-ethyl (3,3,0) Octane for an hour gives a shrinkage temperature around 100°c. Fuither, it has been found that the use of oxazolidine affords better utilisation of chrome when used in chrome tanning. The reduced chrome content in the exhaust liquors helps in pollution control.Note de contenu : - EXPERIMENTAL : Effect of initial pH and time - Effect of concentration - Tannage in combination with chrome - Tannage in combination with vegetable tanning materials - Comparison with glutaraldehyde-chrome combination tannages. Oxazoliding I vs. glutaraldehyde on pretannages of skins - Oxazolidine II vs. Glutaraldehyde on chrome tanning of sheepskins - Oxazolidine II vs. glutaraldehyde on vegetable tannage of sheepskins
- Table 1 : Typical properties of oxazolidines
- Table 2 : Chrome content of finished leather
- Table 3 : Tear strength of finished leather
- Table 4 : Tensile strength of finished leather
- Table 5 : Effect of moist heat on leather
- Table 6 : Effect of perspiration solution on leather
- Table 7 : Tensile strength of vegetable tanned crust leather
- Table 8 : Tear strength of vegetable tanned crust leather
- Table 9 : Chemical analysis of vegetable tanned crust leather
- Table 10 : Effect of moist heat on vegetable leather
- Table 11 : Effect of perspiration solution on vegetable tanned leatherEn ligne : https://drive.google.com/file/d/1G6mpUYSZp3ekgWrtLRMORyPSpD2O_avE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35215
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 97-105[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008597 - Périodique Archives Documentaires Exclu du prêt Oxidising degradation of Valonia extract and utilisation of the products. Part 1. Oxidising degradation of Valonia extract and characterisation of the products / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)
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PermalinkOxidising degradation of Valonia extract and utilisation of the products. Part 2. Combination tannages of degraded product using 10% H2O2 with Cr(III) and AI(III) / Bi Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 1 (01-02/2001)
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PermalinkOxidizing degradation of Valonia extract and utilization of the products - Part 3 : Auxiliary tanning effects of degraded producs using 20% and 30% H202 / Ying Di in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 5 (09-10/2001)
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PermalinkParticle size evolution of chrome tanning agent on tanning effect / Yahui Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 8 (08/2019)
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PermalinkParticle size evolution of melamin-formaldehyde tanning agent on tanning effect / Mengmeng Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
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PermalinkPenetration of the polyflavonoids and simple phenolics : a mechanistic investigation of vegetable tanning / Teng Bo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 12 (12/2017)
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PermalinkPerformance of antimicrobial agents for the preservation of chrome leather / Juliana T. Fontoura in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)
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PermalinkPerformance of a pulse-jet dehydrating system for drying tannery waste sludge / Hayes E. Gahagan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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PermalinkPhospholipid bilayers as vehicles of an anthraquinone disperse dye in leather dyeing / A. de La Maza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 5 (05/1994)
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PermalinkPhosphonium-aluminum combination tanning for goat garment leather / Ren Long-Fang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)
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PermalinkPhosphonium tanning agents control chrome (VI) levels / Richard Temple in WORLD LEATHER, Vol. 15, N° 2 (04/2002)
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PermalinkPhosphonium-zirconium combination tannage for goat garment leather / Qiang Tao-Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)
PermalinkPhysical properties of chrome-tanned Nile perch (lates niloticus) fish leather / Peter Maina Wairimu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)
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PermalinkPhysico-chemical and structural studies on leathers tanned using high exhaust basic chromium sulphate salt / Jonnalagadda Raghava Rao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 5 (07/1998)
PermalinkPhysico-chemical study on micelle formation of chromium-aluminium synthetic tanning materials in various environments and at various temperatures and its application to leather / A. B. Mandal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)
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PermalinkPhysico-chemical study on micelle formation of chromium-aluminium synthetic tanning materials in various environments and at various temperatures and its application to leather / A. B. Mandal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
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PermalinkPhytochemical screening and determination of tannin content of compounds from acacia xanthophloea as viable tanning agents for the leather industry / Michael Cheloti in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)
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PermalinkPhytoremediation of soil using Sesuvium Portulacastrum - Part I / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)
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PermalinkPhytoremediation of tannery wastewater treated lands : Part I : accumulation of Na+ and Ci- IN Salicornia Brachiata / P. Ramesh Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
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PermalinkPhytoremediation of tannery wastewater treated lands : Part II : Using harvested Salicornia Brachiata plants for the preservation of sheepskins / P. Ramesh Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
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