Ornella Abollino

Ornella Abollino
Università degli Studi di Torino | UNITO · Dipartimento di Chimica

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123
Publications
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Publications

Publications (123)
Article
The ion-interaction chromatographic behaviour of Plasmocorinth B (a disulphonated azo dye) and of its complexes formed with metal ions in oxidation states + 2 and + 3 (Cu2+ Ni2+, Al3+, CO3+, Fe3+, Ga3+) was investigated. The effect of cationic ion-pairing agents (tetramethyl-, benzyltrimethyl- and tetrabutylammonium) was also evaluated in the prese...
Article
A fully automated system for on-line high-performance liquid chromatographic separation, reduction and determination by cold vapour atomic absorption spectrometry (CVAAS) of methyl-, ethyl-, phenyl- and inorganic mercury is described. Reversed-phase chromatography on an ODS column and elution with an acetonitrile-water-ammonium tetramethylenedithio...
Article
A dissolution procedure for the analysis of the metal content in Sepia officinalis melanin has been optimized and checked against a bovine liver Community Bureau of Reference (BCR) certified reference material. The content of several metal ions has been determined by GF-AAS and ICP-AES techniques in samples of Sepia officinalis melanin and the resu...
Article
A procedure is described for the determination of the cationic and anionic components in fluorozirconate glasses. Zirconium, barium, aluminium, lanthanum, sodium and hafnium were determined by inductively coupled plasma atomic emission spectrometry (ICP/AES) after dissolution of the sample with an acid mixture in a microwave oven. The fluorine cont...
Article
An on-line preconcentration system implemented with inductively coupled plasma atomic emission spectrometry (ICP-AES) was studied. For the retention of metal ions 8-hydroxyquinoline and Amberlite XAD-2 resin were used. This system improved the detection limits of Cd, Cu, Fe, Mn, Ni and Zn by a factor of 100 compared with ICP-AES alone. Owing to thi...
Article
An on-line preconcentration method utilizing a microcolumn of XAD-2 resin functionalized with 1-(2-thiazolylazo)-2-naphthol has been developed. Preconcentration factors of 125 were easily obtained for injection times of 5 min. The detection limit ranged between 2 ng l-1 for Mn and 40 ng l-1 for Ni. The resin has been used to preconcentrate Cd, Cu,...
Chapter
Eleven different sulphonated azo-dyes were investigated in their ability to chelate metal ions and were evaluated for an application to an ion exchange preconcentration technique. Cu (II) was chosen as a reference metal ion and its uptake efficiencies as a function of experimental parameters were evaluated. The different behaviours were explained i...
Article
Full-text available
A kinetic method for the analytical determination of binary mixtures of gallium and indium in liquid samples is described. The method is based on the spectrophotometric determination of the variation in absorbance connected with the displacement of a metallochromic ligand from the metal ions to be determined. The different reaction rates of gallium...
Article
The liquid chromatographic behaviour of aliphatic mono- and polyamines belonging to different homologous series has been investigated using various pre-column derivatizing agents (OPA and CNB), mobile phases (water-MeOH and water-ACN), RP columns (different packing sizes and shapes) and detectors (UV and fluorescence) in order to characterize the d...
Article
Conditions for the isocratic separation by reversed-phase ion-interaction chromatography of Bi(III), Fe(III), Co(III), Ni(II), Cu(II) and Pb(II) chelates with ethylenediaminetetraacetic acid have been studied using UV-Vis detection. Both chromatographic and spectrophotometric conditions for the determination of these metal chelates are discussed in...
Article
An on-line pre-concentration system for electrothermal atomic absorption spectrometry was developed. A miniature silica C18 column was inserted at the tip of the autosampler arm. A modification of the tubing line of the autosampler allowed either the flow of the sample through the column or the operation of the autosampler in the normal mode. The r...
Article
Sewage sludges and chemical wastes resulting from human and industrial activities are usually dumped into controlled waste sites, where in some cases different bulk chemicals can be present together. The risk assessment at these sites is essential in order to prevent the potential hazards arising from the nature of compounds, from their chemical tr...
Article
An ion-chromatographic procedure is described for the determination of selenium (VI) at μg L−1 level in the presence of anions and heavy metal ions. Maximum permissible concentrations and effects from each interfering substance were investigated for the Se concentration range 12.5–1,000 μg L−1. The method, optimized for the detection of SeO 4 2− ,...
Article
The sorption of 8-hydroxyquinoline and 8-hydroxyquinoline-5-sutfonic acid on a polystyrene-divinylbenzene resin (Amberltte XAD-2) and on an anion exchange resin (Bio-Rad AG MP-1 ) has been used for the uptake and enrichment of trace metal Ions. The Investigated metal Ions were Ca(II), Cd(II), Cu(II), Mg(II), Mn(II), NI(II), Pb(II), and Zn(II). The...
Article
Inductively coupled plasma atomic emission spectrometry has been used in order to evaluate the concentrations of iron and copper impurities in zirconium oxychloride. After suitable wavelength selection an analytical procedure has been developed in order to take account of the heavy matrix effects in the spectroscopic determination of both species,...
Article
Fluoride glasses in the system composed of ZrF4-BaF2-LaF3-AlF3-NaF are investigated as potential low loss materials for optical fibres, operating in the wavelength range of 2-5 μm. The minimum loss of these glasses is predicted to be less than 0.01 db/km based on the precise evaluation for intrinsic loss factors. A present, among several optical fi...
Article
Fluoride glasses, in the system composed by ZrF//4-BaF//2-LaF//3-AlF//3-NaF, are investigated as potential low loss materials for optical fibers, operating in the wavelength range of 2 divided by 5 mu m. The minimum loss of these glasses is predicted to be less than 0. 01 db/km based on the precise evaluation for intrinsic loss factors. At present,...

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