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Determination of formaldehyde content in leather : standard EN ISO 17226 (parts 1 and 2), revision and possible improvements / Sara Cuadros in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 167-174 Titre : Determination of formaldehyde content in leather : standard EN ISO 17226 (parts 1 and 2), revision and possible improvements Type de document : texte imprimé Auteurs : Sara Cuadros, Auteur ; Joaquim Font, Auteur ; Francina Izquierdo, Auteur ; Rosa M. Cuadros, Auteur ; Lluis Ollé, Auteur ; Agusti Marsal, Auteur Année de publication : 2016 Article en page(s) : p. 167-174 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Extraction (chimie) Normalisation Surfactants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The retanning process is the main application of formaldehyde in the tanning industry since formaldehyde participates in two groups of synthetic organic tanning agents: syntans and resins. Resins can be hydrolysed with the result that formaldehyde is released. Thus, formaldehyde in leather can be free or from hydrolysis of resins. Due to the carcinogenic character of formaldehyde, its presence in leather should be avoided or should be below allowable limits. The EN ISO 17226 Standard is the Official Standard for the determination of formaldehyde content in leather, which, in the authors' opinion, presents certain ambiguities in the wording of some operations included in their analysis methods and, some of these operations, are susceptible of improvement. Therefore, a revision of the EN ISO 17226 Standard (Parts 1 and 2) is carried out in this work and, in particular, of the extraction phase of formaldehyde present in leather (possible use of alternative surfactant and shaking method) ; reaction time between the extracted formaldehyde with the dinitrophenyihydrazine solution (Part 1 of the Standard) and stability of the acetylacetone solution (Part 2 of the Standard). Note de contenu : - AIM OF THE WORK - MATERIALS AND METHODS : Starting material. Formulation applied - Methods. Determination of formaldehyde in leather - EXPERIMENTAL PROCEDURES : Revision of the EN ISO 17226 standard - TABLES : 1. Current limits for formaldehyde in differents countries - 2. Current limits for formaldehyde in accordance with the "Restricted Substances Lists" (RSL) of major brands - 3. General formulations for different treatments carried out - 4. Formaldehyde content in samples extracted with sodium dodecyl sulphate or sodium dodecyl sulphonate for different retanning treatments. Quantification of formaldehyde by HPLC - 5. Formaldehyde content iin samples extracted with sodium dodecyl sulphate or sodium dodecyl sulphonate for different retanning treatments. Quantification of formaldehyde by colourimetry - 6. Formaldehyde content in samples using magnetic agitation or reciprocal linear agitation in the extraction phase for different retanning treatments (ISO 17226:2) - 7. Formaldehyde content in samples using fresh or aged acetylacetone solution for different retanning treatments. Quantification by colourimetry En ligne : https://drive.google.com/file/d/1kN8neLZ3EgiEoFOJj3irrOLrLrHhCFiD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26793 [article]

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Development of a reagent kit for rapid determination of chromium (VI) / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 175-179 Titre : Development of a reagent kit for rapid determination of chromium (VI) Type de document : texte imprimé Auteurs : Ding Shaolan, Auteur ; Xie Linhua, Auteur ; Dong Lingxiao, Auteur ; Liu Jing, Auteur ; Zhao Liguo, Auteur Année de publication : 2016 Article en page(s) : p. 175-179 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie -- Essais et réactifs Colorimétrie Eaux usées -- Analyse Eaux usées -- Teneur en chrome hexavalent Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper uses diphenyl carbazide (DPC) dissolved in water with NaCl, which salves the problem that DPC must be dissolved in organic solvants. At the same time, instead of the phosphoric acid medium used normally in the Chinese National Standard Method (GB7467-87), sulfamic acid was made into a solid mixed chromogenic agent. A standard colourimetric board was made and photographed alter the screening for chromium (VI) concentration. The standard colourimetric board and the solid mixed chromogenic reagents and other instruments were assembled into the reagent bottles as the reagent kit for rapid determination of chromium 0/1). This article examined the impact of the coexisting ions Fe3+, Mo6+, Ni2+ and Ca2+ on the chromium (VI) determination with the reagent bottles and determined the composition of the solid mixed chromogenic agent and tested the chromium (VI) optimal concentration and the upper iimit of coexisting ions permitted amount. The reagent kit was applied to the actuel wastewater and evaluated as well. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemical reagents and instrumentation - The development of the reagent bottle method - RESULTS AND DISCUSSION : The preparation of solid mixed chromogenic agent - Results of standard colourimetric board development - Impact of co-existing ions - Measurements of the actual water samples En ligne : https://drive.google.com/file/d/1o1EC2FmkAxJQx1daKTY24LkNH5XXLjoU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26794 [article]

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Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry / Jin Haochen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 182-185 Titre : Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry Type de document : texte imprimé Auteurs : Jin Haochen, Auteur ; Zhang Xinshen, Auteur ; Wan Xu, Auteur ; Wang Junwei, Auteur Année de publication : 2016 Article en page(s) : p. 182-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie Eaux usées -- Analyse Eaux usées -- Teneur en chrome hexavalent Eaux usées -- Teneur en chrome trivalent Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel method using low pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry (LPLC-ICP-MS) has been developed for the determination of water-soluble chromium(III) and chromium(VI) in waste water. The low pressure anion exchange column used in this system contained quaternary ammonium groups, which could separate the Cr(III) from Cr(VI). The ICP-MS was used as the detector in this coupled system to detect the concentration of chromium. The linear range of this method was 10.0ng.L-1~1.0mg•L-1 ; the detection limit of Cr(III) was 3.5ng.L-1, Cr(VI) was 9.8ng•L-1(pH=7) ; the precision of Cr(III) was 2.1%, Cr(VI) was 4.6% (n=6). Compared with National Standard Method of China reste the error was ±6%. Note de contenu : - EXPERIMENTAL PROCEDURE : Reagents - Apparatus - Analytical procedure - RESULTS AND DISCUSSION : Composition and concentration of mobile phase - Flow velocity of mobile phase - Potential of hydrogen (pH) of mobile phase - Comparison of different mass to charge ration (m/z) - Reproductibility calibration curve and detection limit En ligne : https://drive.google.com/file/d/1nzvOrJ0TW5q3z2OdZFkOINBY0U6bsi2y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26795 [article]

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Determination of N, N-dimethylformamide (DMF) in waterborne polyurethane by high performance liquid chromatography / Ren Keshuai in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 186-189 Titre : Determination of N, N-dimethylformamide (DMF) in waterborne polyurethane by high performance liquid chromatography Type de document : texte imprimé Auteurs : Ren Keshuai, Auteur ; Sang Jun, Auteur ; Yu Lingyun, Auteur ; Wang Chunhua, Auteur ; Wu Mengru, Auteur ; Lin Wei, Auteur Année de publication : 2016 Article en page(s) : p. 186-189 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Chromatographie en phase liquide à hautes performances Diméthylformamide Extraction (chimie) Polymères en émulsion Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simple and sensitive method using high performance liquid. chromatography (HPLC) has been developed for the determination of DMF in waterborne polyurethane (WPU) which is used in leather processing. Extraction of DMF is carried out by mechanical oscillation at room temperature for 10 minutes with water as the extraction solvent. Under optimal conditions, the limit of detection is 0.25mg L-1 and the recoveries are 95.2%~102.1%. The proposed method has been successfully applied to the determination of DMF in différent WPU samples. Note de contenu : - EXPERIMENTAL PROCEDURE - APPARATUS : Reagents - Extraction - HPLC conditions - Quantification - RESULTS AND DISCUSSION : The standard curve of DMF - Effect of extraction method - Effect of extraction temperature - Effect of extraction time - Recoveries and precision En ligne : https://drive.google.com/file/d/1KIVP6R5Z9Ojj-C2LsaWFb1wutp9-lcws/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26796 [article]

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Lipid nanoparticles and spontaneous precipitation of a fatliquoring agent / Xu-Gang Dang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 190-197 Titre : Lipid nanoparticles and spontaneous precipitation of a fatliquoring agent Type de document : texte imprimé Auteurs : Xu-Gang Dang, Auteur ; Hui Chen, Auteur ; Ru-Wei Wu, Auteur ; Zhi-Hua Shan, Auteur Année de publication : 2016 Article en page(s) : p. 190-197 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de chevreaux Emulsifiants Emulsions Huile de colza Huiles et graisses Lipides Nanoparticules Photostabilité Produits de nourriture du cuir Tanins végétaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The high temperature emulsifying lipid complex, hydrogenated and sulfonated fatty acid methyl ester — alkyl alcohol amine (HSF-AM), was prepared. As a fatliquoring agent, HSF-AM can be emulsified and dispersed by adding HSF-AM into water above 40°C. The emulsion was stable when HSF-AM was mixed respectively with 1% 1-12SO4 and 5% plant-based tannins. The chemical oxygen demand (COD) and turbidity in the fatliquoring spent liquors alter the fatliquoring process of goatskin shoe upper leather was reduced when HSF-AM spontaneously precipitated at room temperature for the four mixtures of sulfonated rapeseed ail (SFIO) and HSF-AM. The leather samples presented excellent light fastness and low fogging values due to the high saturation degree (low iodine value), the good nanometer dispersion (120nm), and the stability of the nanoparticles emulsion. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of HSF-AM - Determination of the basic properties of HSF-AM - Emulsion stability of HSF-AM - Leather fatliquoring process - RESULTS AND DISCUSSIONS : HSF-AM emulsion characteristics - iodine value, saponification value and hydroxyl value of HSF-AM - The dispersion stability of HSF-AM - The analysis of fatliquoring spent liquors - The physical properties of leather samples - The analysis of light fastness and colour difference - SEM analysis of the sample sections - OM analysis of leather sample surfaces - The fogging value of samples En ligne : https://drive.google.com/file/d/1OAdSh02h4CKTDBwdr1tOkm3sBJzRbALD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26797 [article]

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Synthesis, characterization and application on leather of chromium (III), iron (II) and copper (II) complexes of novel pyrazole naphthol acid dyes in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 198-207 Titre : Synthesis, characterization and application on leather of chromium (III), iron (II) and copper (II) complexes of novel pyrazole naphthol acid dyes Type de document : texte imprimé Année de publication : 2016 Article en page(s) : p. 198-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Propriétés spectrales Colorants -- Propriétés tinctoriales Colorants -- Synthèse Colorants acides Complexes métalliques Cuirs et peaux -- Teinture Naphtols Pyrazoles Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel series of 4-amine-1-pheny1-3methyl-5-pyrazolone based metal complex azo acid dyes (1a-5d) has been prepared from p- Sulphophenyl methyl pyrazolone (1). The synthetic route included the nitrosation of the p-sulphophenyl methyl pyrazolone followed by the reduction to 4-amino-1-(p-sulphopheny1)-3-methy1-4-amino-5-pyrazolone. Diazotization of intermediate (II) and then coupling was done with Naphthol derivatives (1a-5d), in alkaline medium to produce different acid dyes. These dyes were further processed for metallization with 3d transition metals like iron ; chromium and copper. The structures of the novel dyes were confirmed by spectroscopic techniques. The synthesized dyes were applied on leather to evaluate their light fastness, wash fastness and perspiration fastness and must of the dyes were shown to possess high values (rafing 4-5). Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and methods - General procedure for the synthesis of 1-(p-sulphophenyl)-3-methyl-5-pyrazolone based acid dyes - Dyeing method (rotary drum dyeing) - RESULTS AND DISCUSSION : Synthesis of dyes 1a-5d - Spectral properties of dyes - Dyeing properties of dyes En ligne : https://drive.google.com/file/d/1-Ep7iN5Dns_DEUA-y_ZldFxlQL03SYn-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26798 [article]

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Dye incorporated nanopolymers and their application to leather wastewater : a study of removal of Cr(III) ions in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 208-215 Titre : Dye incorporated nanopolymers and their application to leather wastewater : a study of removal of Cr(III) ions Type de document : texte imprimé Année de publication : 2016 Article en page(s) : p. 208-215 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Bleu (couleur) Chrome trivalent Colorants Déchets industriels -- Elimination Eaux usées -- Epuration Ions métalliques Nanopolymères Polymères -- Synthèse Polymérisation en émulsion Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this presented work, Alkali Blue 6B-attached poly(2-hydroxyethyl methacrylate) nanopolymers (nano-PHEMA-AB) were synthesized as an adsorbent for the removal of the heavy metal Cr(III) from leather wastewater. For this purpose, first PHEMA nanopolymers were prepared by surfactant free emulsion polymerization. Alkali Blue 6B was then covalently attached to the PHEMA nanopolymers. Characterization of the nano-PHEMA-ABs was carried out by elemental analysis, SEM, FT-1R and Zeta Size analysis. The specific surface area of nano-PHEMA-AB was calculated to be 1131.2m2/g. The optimum adsorption conditions (i.e. adsorption capacity, medium pH, adsorption rate) were studied and reusability of nano-PHEMA-AB was also determined. The maximum Cr(III) adsorption capacity of nana-PHEMA-AB was found to be 4755.9mg/g al pH3.8. Additionally synthesized nano-PHEMA-AB were used for the removal of Cr(III) ions from chrome tanning wastewater and Cr(III) removal capacity of the nanopolymer was found to be 2724.2mg/g at pH3.9. According to the results, dye incorporated PHEMA nanopolymers can be used as an effective, re-usable remover of Cr(III) from leather wastewater due to their large surface area and high adsorption capacity. Note de contenu : - Characterization of nano-PHEMA-AB - Adsorption of Cr(III) ions - Desorption and reusability of nano-PHEMA-AB - Adsorption of Cr(III) ions from leather wastewater En ligne : https://drive.google.com/file/d/1xbhUDOib2fUXQO84a-D6rpXzcMX--FI1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26799 [article]

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