Sample preparation procedures for determination of Cr2O3 in leather samples using ICP-AES and AAS / K. A. Eid in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 7 (07/2004) . - p. 275-279 Titre : Sample preparation procedures for determination of Cr2O3 in leather samples using ICP-AES and AAS Type de document : texte imprimé Auteurs : K. A. Eid, Auteur ; M. A. Eid, Auteur ; A. El Askar, Auteur ; A. A. Madhy, Auteur ; E. H. Nashy, Auteur Année de publication : 2004 Article en page(s) : p. 275-279 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Three different sample preparation procedures were applied to leather samples, representing four different steps of the tanning process namely, after the tanning step (wet blue), after the retanning step (crust), after normal finishing and after a silicon finishing process. The sample preparation procedures are the conventional procedure in which the samples are fused at 800°C with a mixture of Na2CO3, K2CO3 and borax followed by dissolving in boiling water and filtering. The other two suggested procedures are an ashing/fusion procedure in which the leather sample is ashed at 1000°C followed by an alkali fusion step with NaOH, Na2O2 and Na2CO3 while in the second procedure the leather sample is refluxed with concentrated HNO3. Both procedures lead to complete dissolution of the leather sample. Chromium and consequently Cr2O3 was determined in the prepared sample solutions by using inductively coupled plasma atomic emission spectrometry (ICP-AES) and flame atomic absorption spectrometry (AAS). The obtained results revealed that the direct acid digestion procedure by requiring minimum additive chemicals and no fusion step without leaving any residue represents a convenient procedure for the complete dissolution of leather samples that can be analyzed for Cr using an appropriate analytical technique such as AAS or ICP-AES. The accuracy of the conventional method could be increased by increasing the Na2CO3/ K2CO3/ borax mixture from 4-fold that of the leather sample to 5-fold and, in addition, by raising the ashing temperature from 800°C to 900°C in order to ensure the complete dissolution of the sample. En ligne : https://drive.google.com/file/d/1ntNZ8bNrnADU5p-DwqlbtNIV1K00iqG_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4213 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001604	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001580	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Surface properties and printability of polypropylene film treated by an air dielectric barrier discharge plasma / F. A. Morsy in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B1 (03/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B1 (03/2006) . - p. 49-55 Titre : Surface properties and printability of polypropylene film treated by an air dielectric barrier discharge plasma Type de document : texte imprimé Auteurs : F. A. Morsy, Auteur ; S. Y. Elsayad, Auteur ; A. Bakry, Auteur ; M. A. Eid, Auteur Année de publication : 2006 Article en page(s) : p. 49-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Caractérisation Couches minces Diélectriques Energie de surface Films plastiques Impression sur matières plastiques Polypropylène Technique des plasmas Index. décimale : 667.9 Revêtements et enduits Résumé : The effect of air dielectric barrier discharge plasma treatment on the chemical structure and morphology of polypropylene (PP) film was studied using UV-VIS (ultraviolet-visible), FT-IR, (Fourier transform infrared), SEM (scanning electron microscopy) and AFM (atomic force microscopy). Polypropylene samples were printed using solvent-based gravure ink. An evaluation of the print quality criteria of the treated PP films included measurement of print density and print gloss. SEM investigated the ink laydown on the modified PP film. The results showed that after a few seconds of plasma treatment, both the surface energy and the surface roughness of the treated PP film increased. There was an increase in the absorbance at the almost-visible range, and C=C and C=O bands were found after the air discharge plasma treatment. A short plasma treatment of 15 seconds was found to bring about a dramatic increase in the print density readings, but a decrease in print gloss. The time of the air discharge plasma treatment was found to have no effect on the print density or print gloss at a high ink film thickness. The results showed that air dielectric barrier discharge plasma treatment, for a few seconds, is effective in printing and is economical for industrial use (this will be studied in detail in future work). Note de contenu : - EXPERIMENTAL : Plasma treatment of PP film - Surface characterisation - Printing of PP films - Print evaluation - RESULTS AND DISCUSSION : Surface characterisation results - Print evaluation results - Table 1 : Ink formula DOI : 10.1007/BF02699614 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699614.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5395 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
003916	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)