The electrocatalytic oxidation of mono- and poly-amines was investigated in alkaline solutions at a nickel-based chemically modified glassy carbon electrode. beta-NiOOH exhibited electrocatalytic activity towards amines oxidation. FIA experiments were performed to test the electrode as an amperometric sensor. Under constant-potential amperometric mode (at 0.55 V vs. 4,0 M Ag/AgCl/Cl-), detection limits of all investigated analytes ranged within 1.2-3.8 pmol (S/N=3), and the linear dynamic range extended over three orders of magnitude above the detection limits. Chromatographic separations, performed by an ion moderated partition column in alkaline solutions equipped with the Ni-CME detector, allowed very simple quantitation of aliphatic amines, avoiding tedious and time-consuming derivatization processes or postcolumn addition procedures. The Ni-CME showed good temporal stability and appreciable sensitivity.

ELECTROOXIDATION OF ALIPHATIC AMINES AND THEIR AMPEROMETRIC DETECTION IN FLOW INJECTION AND LIQUID CHROMATOGRAPHY AT A NICKEL-BASED GLASSY CARBON ELECTRODE.

CASELLA, Innocenzo Giuseppe;
1998

Abstract

The electrocatalytic oxidation of mono- and poly-amines was investigated in alkaline solutions at a nickel-based chemically modified glassy carbon electrode. beta-NiOOH exhibited electrocatalytic activity towards amines oxidation. FIA experiments were performed to test the electrode as an amperometric sensor. Under constant-potential amperometric mode (at 0.55 V vs. 4,0 M Ag/AgCl/Cl-), detection limits of all investigated analytes ranged within 1.2-3.8 pmol (S/N=3), and the linear dynamic range extended over three orders of magnitude above the detection limits. Chromatographic separations, performed by an ion moderated partition column in alkaline solutions equipped with the Ni-CME detector, allowed very simple quantitation of aliphatic amines, avoiding tedious and time-consuming derivatization processes or postcolumn addition procedures. The Ni-CME showed good temporal stability and appreciable sensitivity.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/3372
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