Electrochemical Study of Carbon Nanotubes/Nanohybrids for Determination of Metal Species Cu²⁺ and Pb²⁺ in Water Samples

Table 1

Main figures for glassy carbon electrodes and their respective mobilizations with nanomaterials and metal films using Method 1 to analyze Cu²⁺ and Pb²⁺.

Electrode	Cu^2+				Pb^2+
	LOD (ppb)	LOQ (ppb)		Equation	LOD (ppb)	LOQ (ppb)		Equation
GC			0.9974	[Cu^2+]			0.9992	[Pb^2+]
GC/Hg			0.9941	[Cu^2+]		9	0.9996	[Pb^2+]
GC/Bi			0.9993	[Cu^2+]			0.9949	[Pb^2+]
GC/NTC			0.9848	[Cu^2+]			0.9936	[Pb^2+]
GC/CNT/Hg			0.9932	[Cu^2+]			0.9952	[Pb^2+]
GC/CNT/Bi			0.9904	[Cu^2+]			0.9950	[Pb^2+]
GC/CNT/nanoAu-SiO2			0.9964	[Cu^2+]			0.9976	[Pb^2+]
GC/CNT/nanoAu-SiO2/Hg			0.9967	[Cu^2+]			0.9933	[Pb^2+]
GC/CNT/nanoAu-SiO2/Bi			0.9817	[Cu^2+]			0.9956	[Pb^2+]
GC/CNT/nanoSiO2/Hg			0.9978	[Cu^2+]			0.9965	[Pb^2+]
GC/CNT/nanoSiO2/Bi			0.9831	[Cu^2+]			0.9964	[Pb^2+]