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  • 1
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sorption of gold(III) chlorocomplexes was studied by means of a carbon paste electrode modified with montmorillonite. Anionic exchange behavior was found in chloride media with low ionic strength. Anionic sorption of [AuCl4]– can be used as a preconcentration step to the determination of Au(III). Linear calibration dependences were found in the concentration range 4.06 × 10–6– 1.22 × 10–5 mol/L Au(III) after 5 min of sorption and in the range 8.12 × 10–7– 6.1 × 10–6 mol/L after 10 min of sorption. Interferences of several anions and cations were studied. Model samples of table water were analyzed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0768
    Keywords: Key words Clay ; Ionic exchange ; Modified electrodes ; Voltammetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Carbon paste electrodes modified with clay minerals were used for the study of ion-exchange properties of these clay minerals. Cation exchange of Cu(II) was studied by the dependence on the pH, ionic strength and the form of the minerals. The highest anionic exchange of Hg(II) acetates and chlorides was found on montmorillonites. Anionic exchange of Au(III) chloro complexes was found on montmorillonite, but their sorption is strongly influenced by other anions such as chlorides and thiocyanates. The results found are important with regard to the study of the anion-exchange properties of clay minerals.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The clay mineral montmorillonite has been tested as modifier for the carbon paste electrode with a novel electrode modification technique. The differential pulse voltammetric determination of copper(II) by means of this modified carbon paste electrode has been studied. A detection limit of 4×10-8 mol/l has been achieved after 10 min preconcentration under open circuit conditions with subsequent anodic stripping voltammetry. The calibration curve for Cu(II) is linear in the range of 4×10-8–8×10-7 mol/l. Pb interferes in a 10-fold molar and Cd and Hg in a 100-fold molar excess. The interference by humic ligands is significant.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 1009-1013 
    ISSN: 1040-0397
    Keywords: Humic acid ; Carbon paste ; Metal-humic acid interactions ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The carbon paste electrode (CPE) modified with metal salts [CuCO3. Cu(OH)2 and Ag2SO4] was developed. The voltammetric measurement on these modified electrodes in the presence of humic ligands indicated metal complexation reactions. These electrodes offer the possibility of using them in the study of metal-humic substances interaaions and in the study of minerals behavior in the solutions of humic acids (HAs).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 683-687 
    ISSN: 1040-0397
    Keywords: Mercury determination ; humic acid ; modified electrodes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The binding of Hg(II) with humic acid, incorporated into the carbon paste electrode, was verified. This modified humic acid electrode was used for the trace determination of Hg(II). The differential-pulse voltammetry on the electrode modified with humic acid yielded good performance over the concentration range 5 × 10-8-5 × 10-7 M Hg(II). Only Cu(II) interferes with the determination.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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