In this work we describe the first report for the determination of promazine using a nanostructure-
modified ionic liquid carbon paste electrode in aqueous solutions. To achieve this goal, a novel modified
carbon paste electrode using ZnO nanoparticles and 1-methyl-3-butylimidazolium bromide as a binder
(ZnO/NPs/ILs/CPE) was fabricated. The oxidation peak potential of promazine at the surface of the ZnO/
NPs/ILs/CPE appeared at 685 mV, which was about 65 mV lower than the oxidation potential at the
surface of CPE under similar conditions. Also, the peak current was increased to about 4.0 times higher at
the surface of ZnO/NPs/ILs/CPE compared to that of CPE. The linear response range and detection limit
were found to be 0.08–450 and 0.04 mmol/L, respectively. The modified electrode was successfully used
for the determination of promazine in real samples with satisfactory results.
