A carbon paste electrode modified with p-
chloranil and carbon nanotubes was used for the sensitive
and selective voltammetric determination of hydroxylamine
(HX) and phenol (PL). The oxidation of HX at the modified
electrode was investigated by cyclic voltammetry (CV),
chronoamperommetry, and electrochemical impedance
spectroscopy. The values of the catalytic rate constant (k),
and diffusion coefficient (D) for HX were calculated. Square
wave voltammetric peaks current of HX and PL increased
linearly with their concentrations at the ranges of 0.1–172.0
and 5.0–512.0 μmol L
−1
, respectively. The detection limits
for HX and PL were 0.08 and 2.0 μmol L
−1
, respectively.The separation of the anodic peak potentials of HX and PL
reached to 0.65 V, using square wave voltammetry. The
proposed sensor was successfully applied for the determination
of HX and PL in water and wastewater samples.
