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  • 1995-1999  (2)
  • Chemistry  (2)
  • Electrocatalysis  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Solid-state amperometric sensors for gas phase analytes: A review of recent advances (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 97-101 
    Details
    ISSN: 1040-0397
    Keywords: Amperometric sensor ; Gas analysis ; Solid electrolytes ; Modified electrodes ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A review is geven on solid-state amperometric sensors designed for the detection of gaseous analytes. Attention is geven primarily to sensors used in the absence of a bulk liquid phase that have been reported in the literature since 1992, although a historical perspective is presented. The review is limited to sensors employing solid polymer electrolytes, transition metal powders, and inorganic materials prepared by sol-gel processes as the solid-state electrylyte. The wide applicability of solid atate sensors to gas phase species is demonstrated through numerous examples. Analytes determined include O2, H2, CO, NO2, NH3, and SO2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090202
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical oxidation and determination of heparin at electrodes modified with ruthenium oxide or copper oxide (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 675-679 
    Details
    ISSN: 1040-0397
    Keywords: Heparin ; Modified electrodes ; Electrocatalysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical oxidation of full-size heparin (13-15 kDa) is demonstrated in 1 M H3PO4 at a glassy carbon electrode coated with a ruthenium oxide film. The pathway apparently is analogous to chemical oxidation by periodate. By comparison to currents from inorganic species, it is apparent that only about 2 electrons per mole are involved. Flow injection analysis (FIA) allowed determinations down to 2 μM heparin, but the calibration plot was nonlinear. Low molecular weight heparin (5-6 kDa) was not electroactive with this system. In basic solution at a glassy carbon electrode that is modified with a film of Cu2O, both full-size and low molecular weight heparin are oxidized. The pathways involved oxidative desulfation and attack on saccharide units with evolution of CO2. Linear calibration plots which extended into the sub-μM level were obtained by FIA. The detection limits, which were based on a value of 3 for the ratio of the signal to the standard deviation of replicates, were 9 nM for full-size and 20-30 nM for various low molecular weight heparin samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140090903
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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