Table 2 Selectivity coefficients of various ions for the RT NP-modified electrode

Cd²⁺

7.05 × 10⁻³

Cr³⁺

2.45 × 10⁻³

Ni²⁺

8.10 × 10⁻⁴

Zn²⁺

2.55 × 10⁻⁵

Pb²⁺

8.25 × 10⁻⁴

Fe³⁺

8.06 × 10⁻⁵

Hg²⁺

1.26 × 10⁻³

NO₂⁻

2.90 × 10⁻⁴

Mn²⁺

1.38 × 10⁻⁴

Ag⁺

5.41 × 10⁻³

HCO₃⁻

6.53 × 10⁻⁵

PO₄³⁻

6.13 × 10⁻⁶

Se⁴⁺

1.05 × 10⁻³

NH₄⁺

4.67 × 10⁻³