Table 5. Interference Effect of Various Metal Ions with the 3-NBBSH/Nafion/GCE^a.

	observed current (μA)
metal ions	R1	R2	R3	average	interference effect (%)	SD (n = 3)	RSD (%) (n = 3)
Hg2+	1.85	0.96	2.27	1.69	100	0.67	39.50
Ba2+	0.65	0.55	0.53	0.58	34	0.06	11.15
Cd2+	0.50	0.48	0.46	0.48	28	0.02	4.17
Co2+	0.47	0.45	0.43	0.45	27	0.02	4.44
Ni2+	0.44	0.41	0.42	0.43	25	0.02	3.61
Pb2+	0.43	0.40	0.40	0.41	24	0.02	4.22

^aInterference effect of Hg²⁺ is considered to be 100%; R, reading; SD, standard deviation; and RSD, relative standard deviation.