Electrooxidation of aliphatic amines and their amperometric detection in flow injection and liquid chromatography at a nickel-based glassy carbon electrode
Ig. Casella et al., Electrooxidation of aliphatic amines and their amperometric detection in flow injection and liquid chromatography at a nickel-based glassy carbon electrode, ELECTROANAL, 10(15), 1998, pp. 1005-1009
The electrocatalytic oxidation of mono- and poly-amines was investigated in
alkaline solutions at a nickel-based chemically modified glassy carbon ele
ctrode. beta-NiOOH exhibited electrocatalytic activity towards amines oxida
tion. FIA experiments were performed to test the electrode as an amperometr
ic 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 order
s oi magnitude above the detection limits. Chromatographic separations, per
formed by an ion moderated partition column in alkaline solutions equipped
with the Ni-CME detector, allowed very simple quantitation of aliphatic ami
nes, avoiding tedious and time-consuming derivatization processes or postco
lumn addition procedures. The Ni-CME showed good temporal stability and app
reciable sensitivity.