This paper describes the development a novel
ruthenium(II) complex-ZnO/CNTs modified carbon paste
electrode (Ru(II)/ZnO/CNTs/CPE) for the electrocatalytic
determination of ascorbic acid (AA). The objective of
this novel electrode modification was to seek new electrochemical
performances for the detection of AA, nicotinamide
adenine dinucleotide (NADH) and folic acid (FA).
The peak potentials recorded were 170, 500 and 830 mV
vs. Ag/AgCl/KClsat for AA, NADH and FA, respectively.
The peak currents were linearly dependent on AA,
NADH and FA concentrations using square wave voltammetry
(SWV) method at the ranges of 0.008–251, 1.0–650,
and 3.0–700 mmolL1, with detection limits of 0.005, 0.5,
and 1.0 mmolL1, respectively.