Modification of Multiwalled Carbon Nanotubes by Dipyridile Amine for Potentiometric Determination of Lead(II) Ions in Environmental Samples

Table 2

Matched potential selectivity coefficient for interfering cations.

Interfering ions (𝑋)	𝑘^MPMHg,𝑋
Na^+	2.1 × 10^−4
K^+	8.4 × 10^−4
Cs^+	3.1 × 10^−3
Ca^2+	6.3 × 10^−4
Mg^2+	7.7 × 10^−4
Cd^2+	4.3 × 10^−3
Ni^2+	8.1 × 10^−3
Cu^2+	2.9 × 10^−3
Cr^3+	7.4 × 10^−3
Fe^3+	4.5 × 10^−3
Ag^+	7.8 × 10^−3
Zn^2+	8.3 × 10^−3