Chromium(VI) extracted from leather using acid and alkaline artificial perspiration / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 5 (09-10/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 5 (09-10/2009) . - p. 193-196 Titre : Chromium(VI) extracted from leather using acid and alkaline artificial perspiration Type de document : texte imprimé Auteurs : Dai Hong, Auteur ; An Xun, Auteur ; Zhang Zongcai, Auteur Année de publication : 2009 Article en page(s) : p. 193-196 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As we know, when leather and its products are used in contact with skin, perspiration may dissolve components from the leather and this may include Cr(VI) so, using artificial perspiration to extract chromium (VI) in leather is of significance. Determination of chromium(VI) in leather using extraction with pH5.5 and 8.0 artificial perspiration solution and subsequent determination with DPC photometric method has been studied. The linearity, repeatability and recovery percentage were tested to evaluate the determination methods. The results show that the experimental methods have good linearity, feasibility and reliability. The result also illustrate that less chromium(VI) is extracted from leather with pH5.5 artificial perspiration solution than with pH8.0 alkaline artificial perspiration solution. En ligne : https://drive.google.com/file/d/1Wg24MAwKyqSwq_Uqso4GswqrBrC1uKJP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6279 [article]

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Determination of chromium(VI) extrated from leather by artificial perspiration / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 1 (01-02/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 1 (01-02/2009) . - p. 26-28 Titre : Determination of chromium(VI) extrated from leather by artificial perspiration Type de document : texte imprimé Auteurs : Dai Hong, Auteur ; Lin Jin, Auteur ; Feng Guanlin, Auteur ; Zhang Zongcai, Auteur Année de publication : 2009 Article en page(s) : p. 26-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome Cuirs et peaux Photométrie Transpiration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Determination of chromium(VI) in leather using extraction with an artificial perspiration solution and subsequent determination with a DPC photometric method has been studied. The results show that correlation coefficient was 0,9999, which testifies to the good linearity of this method. Furthemore, RSD (n=8) and the recovery percentage were 2.05 % and 94.3 %-103.8 % which also illustrates the feasibility and reliability of the method. En ligne : https://drive.google.com/file/d/12OBqDwSaCh5XHaurjld_af7cnvpSZbY0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4102 [article]

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Determination of Cr(VI) content in leather with anodic stripping voltammetric polarography / Zhu Zhengxin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 6 (11-12/2011)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 6 (11-12/2011) . - p. 255-258 Titre : Determination of Cr(VI) content in leather with anodic stripping voltammetric polarography Type de document : texte imprimé Auteurs : Zhu Zhengxin, Auteur ; An Xun, Auteur ; Zhang Zongcai, Auteur ; Dai Hong, Auteur Année de publication : 2011 Article en page(s) : p. 255-258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Micro-ondes Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Voltampérométrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An anodic stripping voltammetric method has been developed for determination of Cr(VI) content in leather treated with nitric acid-hydrogen peroxide microwave digestion. Microwave digestion was used in sample preparation for its fast digestion, lower reagent consumption and safe operation. The sample solution was mixed with DTPA (diethylenetriaminepentaacetic acid)-sodium acetate-sodium nitrate buffer solution, and then it was purged with oxigen free nitrogen for 300 seconds before deposition of the metals was carried out by applying a constant potential versus Ag/AgCl to the hanging mercury drop electrode (HMDE) for 60 seconds. A standard addition procedure was used for quantification. The repeatability and recovery percentage were tested to evaluate the determination methods. The results showed that Cr(VI) content in leather sample determined was 0.68mG/kG. Relative standard deviations for 8 replicate determinations of µg/L Cr(VI) standard solution and leather samples were carried out and the precision test results were 1.338 and 7.47 % respectively. recovery percentage was in the range from 97.22 % to 106.58 %. The proposed method is simple, convenient, sensitive and reliable. Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Chemical reagents and materials - Ready-to-use solutions - Sample preparation - Voltammetric analytical procedure - RESULTS AND DISCUSSION : Effect of operational parameters - Tests of Cr(VI) leather samples En ligne : https://drive.google.com/file/d/1rDu2ynaD5pxZdS-c5sDwWDOAx0nfDpwd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12880 [article]

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Determination of volatile aldehyde and ketone in leather shoes with static absorption and high performance liquid chromatography / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 4 (07-08/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 4 (07-08/2017) . - p. 179-182 Titre : Determination of volatile aldehyde and ketone in leather shoes with static absorption and high performance liquid chromatography Type de document : texte imprimé Auteurs : Dai Hong, Auteur ; Wu Jie, Auteur ; Jia Wenrui, Auteur ; Chen Lei, Auteur ; Zhang Zongcai, Auteur Année de publication : 2017 Article en page(s) : p. 179-182 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption Aldéhydes Un aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle. L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse. Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde. Cétones Chaussures Chromatographie en phase liquide à hautes performances Composés organiques volatils Cuirs et peaux -- Analyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, volatile low molecular weight aldehydes and ketones in samples of leather shoes were collected by static absorption with water, analyzed and detected by 2,4dinitrophenylhydrazine pre-column derivatization of high performance liquid chromatography (HPLC). Firstly, the sampling temperature and lime of the volatile aldehyde and ketone in leather shoes were optimized and then the volatile aldehyde and ketone in absorption liquid were determined. The experiment result shows that the optimal temperature is 45°C, the sampling time is 24 hours. The collected sample was derivatized by purified sulfuric acid acidulated 2,4dinitrophenylhydrazine. The volatile aldehydes and ketones in absorption liquid of leather shoes were formaldehyde, acetaldehyde, acetone propionaldehyde, butyraldehyde, benzaIdehycle, cyclohexanone and hexanal the average concentrations of which are : 0.252mg/shoe, 0.061mg/shoe, 0.079mg/shoe, 0.053mg/shoe, 0.037mg/shoe, 0.011mg/shoe, 0.09mg/shoe, 0.018mgishoe respectively. This method is suitable for determination of volatile aldehydes and ketones in leather shoes. Note de contenu : - EXPERIMENTAL PROCEDURE : Main materials and reagents - Laboratory apparatuses and devices - Experimental methods and procedures - RESULTS AND DISCUSSION : The sampling time of the volatile aldehyde and ketone in leather shoes - Sampling temperature of the volatile aldehyde and ketone in leather shoes En ligne : https://drive.google.com/file/d/1LMkLPfmap_End_o9fKlCA89GLHW87xkU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28891 [article]

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Influence on rex rabbit hair by low-temperature plasma in different gas media / Zhang Meina in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 2 (03-04/2019) . - p. 91-98 Titre : Influence on rex rabbit hair by low-temperature plasma in different gas media Type de document : texte imprimé Auteurs : Zhang Meina, Auteur ; Liu Hongyan, Auteur ; Li Lixin, Auteur ; Zhang Zongcai, Auteur Année de publication : 2019 Article en page(s) : p. 91-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures Brillance (optique) Colorants acides Colorimétrie Fixation (chimie) Fourrures -- Propriétés mécaniques Fourrures -- Teinture Frottements (mécanique) Lapins Mesure Spectroscopie de photoélectrons Technique des plasmas Index. décimale : 675.3 Technologie de la fourrure Résumé : In order to find out changes of the Rex rabbit hair under different Low Temperature Plasma (LTP) treatments, Rex rabbit hair fibres which were modified by oxygen, nitrogen, and air plasma, were examined by XPS, ultraviolet-visible spectrophotometery, Lab-eye software, HP-386 multi-angle gloss meter, YM-06A electronic single fibre strength meter, as well as by a Y151 fibre friction coefficient tester. The results show that oxygen plasma, nitrogen plasma and air plasma can all dramatically enhance exhaustion and fixation rate of Rex rabbit hair during dyeing. Treatment with air plasma and nitrogen plasma introduced more -NH2 to the surface of Rex rabbit hair fibres, promoting the reaction between -N1-12 and -SO3H of an anionic dyestuff in an acidic medium. Besides, the oxidation of oxygen plasma introduces polar functional groups such as hydroxyl or carbonyl, thus improving the hydrophilicity of Rex rabbit hair fibres. Compared with fibres without plasma treatment, the dyeing depth of fibres treated with oxygen, air, and nitrogen plasma has been significantly enhanced. ln addition, the rupture strength and elongation as well as glossiness of fibres reduces to a slight extent after LTP treatment with oxygen, nitrogen, and air. Ultimately, after oxygen, air and nitrogen plasma, the gap between the friction coefficients of against and along scale is narrowed, which can enhance the ability of the anti-felting performance. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Low-temperature plasma treatment - Dyeing process - Exhaustion and fixation rate measurement - XPS analysis - Colour measurement - Glossiness and strength measurement - Coefficient of friction determination - RESULTS AND DISCUSSIONS : Exhaustion and fixation rate - XPS analysis - Effect of LTP treatment on the glossiness and strength of Rex rabbit hair fibre - Effect of LTp treatment on the friction coefficient of Rex rabit wool fibre - Table 1 : Exhaustion and fixation of different samples dyed with anionic dyestuff - table 2 : Element analysis of LTP trated Rex rabbit hair fibres - Table 3 : The functional group content of Rex rabbit hair fibre - Table 4 : The influence of LTP treatment on the strength of the fibres - Table 5 : The influence of low-temperature plasma treatment on the friction coefficient of the fibres En ligne : https://drive.google.com/file/d/1JD27EmIpv-vh44OuM1dkP3JhAoz5JUlR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32306 [article]

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Preparation and characterisation of reactive oil tanning agent based on lanolin / Wenkang Han in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 5 (09-10/2020)  

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The separation of hydrolysate of enzyme-soluble pigskin by chromatography and sodium dodecyl sulphate-polyacrylamide gel electrophoresis / Dai Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)  

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