2.3. Sensor preparation
A CdO nanoparticle (CdO/NP)modified 1-methyl-3-butylimidazolium
bromide ionic liquid carbon paste electrode (CdO/NP/IL/CPE) was prepared
by mixing 0.10 g of ionic liquids, 0.9 g of the liquid paraffin,
0.05 g of CdO/NPs, and 0.95 g of graphite powder in a mortar and pestle.
Then the above mixturewas mixedwell for 45 min until a uniformly wetted
paste was obtained. A suitable amount of the carbon paste was filled
firmly into one glass tube as described above to prepare the sensor.