Determination of Al2O3 in tanning liquor by flow-injection spectrophotometry / Yuan Dong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 6 (11-12/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 6 (11-12/2007) . - p. 233-235 Titre : Determination of Al2O3 in tanning liquor by flow-injection spectrophotometry Type de document : texte imprimé Auteurs : Yuan Dong, Auteur ; Fu Dayou, Auteur ; Zhang Xinshen, Auteur ; Liping Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 233-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Liqueurs de tannage Spectrophotométrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A flow-injection spectrophotometric method for the determination of aluminium(III) has been described. The method is based on the reaction Al(III) with morin to form a yellow complex with maximum absorption at 425nm in the presence of cationic surfactant CPC and glacial acetic acid. In the presence of cationic surfactant CPC, the sensitivity of the chromogenic reaction was greatly improved. Under the optimized conditions, calibration graphs for Al(III) are linear in the range 5-150g l-1 with a detection limit of 0.0125g l-1 (3σ). The reproducibility was satisfactory with a relative standard deviation of 1.7% for ten determinations of 50μg l-1 Al(III). With a sample solution of 450μl being injected, the sampling frequency is 60/h. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Apparatus - Preparation of solutions - Flow injection procedure - RESULTS AND DISCUSSION : Choice of wavelength - Optimization of the reaction conditions - Optimization of flow injection variables - Calibration curve, reproducibility and detection limit - Effects of interferences - Analysis of samples - Table 1 : Results of determination of Al2O3 content of samples En ligne : https://drive.google.com/file/d/1kXEUo1GW_tynre-YrBmRIo42oVH1QUvU/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39004 [article]

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Determination of surfactants in leather wastewater by flow injection spectrophotometry / Yuan Dong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 1 (01-02/2007) . - p. 19-20 Titre : Determination of surfactants in leather wastewater by flow injection spectrophotometry Type de document : texte imprimé Auteurs : Yuan Dong, Auteur ; Zhang Xinshen, Auteur ; Fu Dayou, Auteur ; Tu Jie, Auteur ; Zou Yuquqn, Auteur ; Li Xiang, Auteur Année de publication : 2007 Article en page(s) : p. 19-20 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Cuirs et peaux Eaux usées -- Analyse Eaux usées -- Teneur en surfactants Spectrophotométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simple flow injection spectrophotometric method based on the reaction of malachite green with sodium dodecylbenzenesulfonate (SDBS) was proposed to determine surfactants in leather wastewater. SDBS was determined in a Na2HPO4 -KH2PO4 buffer solution (pH7.0) at 622nm. Under the optimum conditions, the linear range for SDBS was 0.05-3.0mg l-1, and the relative standard deviation (n = 9) for 0.5mg/L SDBS was 0.81%. The proposed FI method has been applied to the determination of anionic surfactants in leather wastewater with satisfactory results. Note de contenu : - EXPERIMENTAL PROCEDURE : Reagents - Apparatus - Preparation of solutions - Flow injection procedure - RESULTS AND DISCUSSION : Choice of pH - MG concentration - Effect of flow rate - Effect of reaction coil length - Samping volume - Effects of interference ions - RESULTS - Table 1 : Determination of surfactants in leather wastewater - as SDBS En ligne : - EXPERIMENTAL PROCEDURE : Reagents - Apparatus - Preparation of solutions - Flo [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39042 [article]

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A fast method to determine formaldehyde in leather wastewater / Yuan Dong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 3 (05-06/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 3 (05-06/2010) . - p. 98-101 Titre : A fast method to determine formaldehyde in leather wastewater Type de document : texte imprimé Auteurs : Yuan Dong, Auteur ; Fu Dayou, Auteur Année de publication : 2010 Article en page(s) : p. 98-101 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimiluminescence Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Analyse Formaldéhyde Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new simple and sensitive reverse flow injection chemiluminescence (FI-CL) method is described for the determination of formaldehyde. The method is based on the CL-Emitting reaction between ninhydrin and potassium permanganate in hydrochloric acid medium, enhanced by formaldehyde (HCHO). The calibration curve is linear in the range of 0.002 to 10µg ml-1 with r=0.9995, and the limit of detection is 4.6 x 10-4µg ml-1. The relative standard deviation for replicate measurements is 1.5 % for 4µg ml-1 of formaldehyde. The chemical and flow injection variables were studied and optimized to make the procedure suitable for determination of formaldehyde in water. It is shown that the reverse flow injection analysis could greatly improve the sensitivity and precision for determination of formaldehyde. The procedure has been applied successuflly to the determination of formaldehyde in leather wastewater, and the results were statistically compared with results determined by a standard method. En ligne : https://drive.google.com/file/d/1YZweXkUHSJuW6CeEbsl654KyER7b1pTs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9622 [article]

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