Table 2.

Comparison of the present method with other reported methods.

Method	LOD	Linear range	Refs.
HPLC-electrospray ionization (ESI)-MS	0.02 μg/mL	0.03–3 μg/mL	[3]
RP-HPLC-fluorescence	0.078 μg/mL	0.078–20.00 μg/mL	[57]
IL-DLLME followed by the HPLC method	0.01 μg/mL	0.04–10.0 μg/mL	[58]
Bi2O3/ZnO/GCE	40.5 nM or 15.77 ng/mL	150−1000 nM	This work