Quasireversible Process of Dopamine on Copper-Nickel Hydroxide Composite/Nitrogen Doped Graphene/Nafion Modified GCE and Its Electrochemical Application

Table 1

Influence of coexisting substances on the determination of 0.03 mmol L⁻¹ DA (𝑛=3).

Coexisting substance	Concentration ratio of dopamine : interferent	Current ration^a (%)^a
Zn^2+	1 : 100	0.993
K^+	1 : 100	1.01
Cl^−	1 : 100	0.985
NO3^−	1 : 100	0.997
Na^+	1 : 100	1.01
Mg^2+	1 : 100	0.983
Glucose	1 : 1000	1.04
Ascorbic acid	1 : 100	1.04
Uric acid	1 : 100	0.465
H2O2	1 : 100	0.977

aThe current ratio is defined as the ratio of currents obtained from 0.03 mmol L⁻¹ DA with and without interferent.