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  • Amperometric detection  (1)
  • Humic substances  (1)
  • Potentiometric detection  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 541-543 
    ISSN: 1040-0397
    Keywords: Amperometric detection ; Solid-phase extraction ; Flow injection analysis ; Nickel electrode ; Ethanol ; Wine analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ethanol in wines was determined by flow injection analysis with an amperometric detector using an oxidized nickel wire. Solid-phase extraction with a strong anion exchanger was used to remove interferences such as organic acids from the matrix, and the residue of the extraction was injected directly into the FIA system. The recoveries of ethanol from wines spiked with standards ranged from 101% to 103%. The response of the nickel electrode to ethanol is dependent on the applied potential and the pH of the carrier. The optimal conditions for the detection of ethanol were an applied potential of +0.60 V (vs. Ag/AgCl) in a carrier of 100 mM sodium hydroxide solution. The electrode exhibited a linear response from 10-5 to 10-3 M, with a detection limit of 1 × 10-6 M. The method was demonstrated by the determination of ethanol in wines.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 818-821 
    ISSN: 1040-0397
    Keywords: Tungsten oxide electrode ; Potentiometric detection ; Liquid chromatography ; Metal ions ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of a tungsten oxide sensor for the potentiometric detection of metal ions separated by liquid chromatography is described. Separation of metal ions such as Fe3+, Fe2+, Cu2+ and Pb2+ was performed by ion chromatography using a mobile phase containing 25 mM sodium tartrate/2 mM ethylenediamine at pH 3.8. Calibration plots were linear in the range 0.5 to 3.5 mM. Potentiometric detection was also applied to ion-interaction chromatography. The results showed that separation of metal ions was improved and the detection limits for the test metals in the range of 0.5-5 nmol were obtained in the presence of sodium citrate/1-octanesulfonic acid at pH 3.0. The potentiometric detection described in this article is shown to have advantages in terms of low cost, simplicity and sensitivity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 1278-1282 
    ISSN: 1040-0397
    Keywords: Ion-selective electrode ; ESR investigation ; pH titration ; Copper ion ; Humic substances ; HS-Cu complexes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A carbon rod electrode coated with a poly(vinyl chloride) (PVC) membrane containing aquatic humic substances (HS) isolated from swamp water was constructed for the detection of copper(II) ion. The electrode exhibits a linear response with a slope of 60.1 ± 2.0 mV/decade in concentration range from 10-5 mol L-1 to 10-2 mol L-1. The detection limit for the copper(II) ion was estimated to be of 1 × 10-5 mol L-1. Electron spin resonance spectroscopy (ESR) and pH titration results indicated that the humic substances interact with copper(II) ions to form complexes. These results confirm that the potential response of the membrane electrode with good sensitivity, selectivity except for Pb2+ and Hg2+, and response to copper(II) ion is due to the formation of stable complexes occurring at the electrode surface.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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