Voltammetric Study of the Copper Pentacyanonitrosylferrate Adsorbed on the Silica Modified with a Poly(propylene)imine Hexadecylamine Dendrimer for Determination of Nitrite

Table 1

Relationship between the diameter of hydrated cations and the electrochemical parameters of CuNPSD (electrolyte 1.0 mol L⁻¹; v = 20 mV s⁻¹; pH = 7.0).

Cation	[𝐼pa/𝐼pc]1	*(𝐸^𝜃)1	* Δ𝐸𝑝1 (V)	[𝐼pa/𝐼pc]2	(𝐸^𝜃)2	Δ𝐸𝑝2 (V)	Diameter of hydrated cation (nm)**
Li^+	1.22	0.31	0.228	0.81	0.77	0.033	0.470
Na^+	1.05	0.32	0.219	0.88	0.77	0.033	0.360
K^+	0.98	0.32	0.216	0.95	0.79	0.030	0.240
NH4^+	0.86	0.31	0.181	0.86	0.78	0.031	0.245

^∗𝐸^𝜃(V) = (𝐸_pa+𝐸_pc)/2eΔ𝐸𝑝 (V) = |𝐸_pa−𝐸_pc|,^∗∗Ref. [38].