Speciation of chromium ions in tannery effluents and subsequent determination of Cr (VI) by ICP-AES / M. A. Eid in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 11 (11/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 11 (11/2002) . - p. 451-455 Titre : Speciation of chromium ions in tannery effluents and subsequent determination of Cr (VI) by ICP-AES Type de document : texte imprimé Auteurs : M. A. Eid, Auteur ; E. A. Al-Ashkara, Auteur ; K. A. Eid, Auteur ; E. H. Nashy, Auteur ; E. H. Borai, Auteur Année de publication : 2002 Article en page(s) : p. 451-455 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Speciation of chromium in the effluents of two local tanneries has been carried out using two procedures. In the first procedure, Cr(III) was precipitated as Cr(OH)3 while in the second a cation exchange resin (Amberlite® IR 120H) was used for its preconcentration. The separated Cr(VI) was then determined in the solution with the aid of inductively coupled plasma-atomic emission spectrometry (ICP-AES). The efficiency of the two procedures was first tested by analyzing synthetically prepared solutions containing the two Cr species. The two methods were applied for the determination of Cr(VI) in samples collected from different sites in the two tanneries. The results revealed that Cr(VI) is detected in the wet finishing step of the tanning process of the two tanneries at average concentrations of 10.5 and 16.6 µg ml-1 respectively and is also present at a much lower level namely at 0.42 and 2.39 µg ml-1 in the final drain of the two plants respectively. The validation of the suggested methods was confirmed by ion chromatography. It is advised to collect the wastewater of the wet-finishing Speciation of chromium in the effluents of two local tanneries has been carried out using two procedures. In the first procedure, Cr(III) was precipitated as Cr(OH)3 while in the second a cation exchange resin (Amberlite® IR 120H) was used for its preconcentration. The separated Cr(VI) was then determined in the solution with the aid of inductively coupled plasma-atomic emission spectrometry (ICP-AES). The efficiency of the two procedures was first tested by analyzing synthetically prepared solutions containing the two Cr species. The two methods were applied for the determination of Cr(VI) in samples collected from different sites in the two tanneries. The results revealed that Cr(VI) is detected in the wet finishing step of the tanning process of the two tanneries at average concentrations of 10.5 and 16.6 µg ml-1 respectively and is also present at a much lower level namely at 0.42 and 2.39 µg ml-1 in the final drain of the two plants respectively. The validation of the suggested methods was confirmed by ion chromatography. It is advised to collect the wastewater of the wet-finishing step separately and pass it through an Al2O3 column for the removal of chromium, before it is allowed to mix with the rest of the plant effluents. En ligne : https://drive.google.com/file/d/1OrqM2GAHVHvVd3aXBGpUb_dwHRXvMArl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4245 [article]

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