Automatic on-line determination of trace chromium(VI) in chromium(III)-bearing samples by reverse adsorption process / Minghua Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 1 (01-02/2002) . - p. 1-5 Titre : Automatic on-line determination of trace chromium(VI) in chromium(III)-bearing samples by reverse adsorption process Type de document : texte imprimé Auteurs : Minghua Liu, Auteur ; Xinsheng Zhang, Auteur Année de publication : 2002 Article en page(s) : p. 1-5 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Analyse par injection en flux continu L’analyse par injection en flux continu (Flow Injection Analysis FIA) consiste, dans son principe le plus simple, en l’injection d’un petit volume (µL) d’une solution échantillon dans un fluide en mouvement ; ce liquide transporteur, qui se déplace de façon continue, n’est pas segmenté, et la zone formée par l’injection répétée de l’échantillon est ainsi transportée vers un détecteur afin d’enregistrer les variations d’un paramètre physique ou physico-chimique caractéristique de l’échantillon ou, le plus souvent, de l’un de ses éléments constitutifs. Analyse quantitative (chimie) Chrome hexavalent Chrome trivalent Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Increasingly stringent environmental standards makes it necessary to determine chromium(VI) ion in chromium(III)-bearing samples. However, high concentrations of Cr3+ ion significantly interferes with the determination of trace amounts of Cr(VI). A simple flow-injection manifold, which has dual functions of adsorption and determination, was therefore developed to remove Cr(III) interference and to determine trace Cr(VI) automatically. Reverse adsorption tests were conducted by applying an adsorption column in the flow injection manifold for on-line removal of Cr3+ ion prior to determination. A new spherical cellulose adsorbent, SCAM-1, was used as the adsorption column filling. Tests of precision, recovery and linear range were also conducted to evaluate the above method. The results show that the variation coefficients are less than 4.0 % with recoveries ranging from 95.2 % to 104.8 %. Three calibration curves were obtained over the concentration range of 0.052 to 52.0 mg/L. The detection limit of the method developed for Cr(VI) ion is 0.009±0.0003 mg/L. Moreover, tolerable concentrations of co-existing Cr(III) can reach 312.0 g/L. Consequently, the manifold and the proposed method are ready for automatic on-line determination of trace Cr(VI) when present in large amounts of Cr(III). Note de contenu : - EXPERIMENTAL PROCEDURE : Reageants - Instruments and apparatus - Flow injection manifold - RESULTS AND DISCUSSION : Effect of the DPC reagent - Flow injection variables - Linear tests - Precision tests - Recovery tests - Detection limit - Comparison tests - Determination of Cr(VI) in chromium(III)-bearing samples - Table 1 : Properties of SCAM-1 - Table 2 : Operating conditions - Table 3 : Results of the statistical treatment performed on the pairs of data obtained by FIA - Table 4 : Results of precision tests - Table 5 : Recovery study of Cr(VI ) added to various samples - Table 6 : Analytical results of chromium(III )-bearing samples En ligne : https://drive.google.com/file/d/1TzqR4wGhw-ph34Ytgz9xgSuM71VmJ7AK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40189 [article]

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