Journal of Analytical Methods in Chemistry

Research Article

Functionalized Fe₃O₄ Magnetic Nanoparticle Potentiometric Detection Strategy versus Classical Potentiometric Strategy for Determination of Chlorpheniramine Maleate and Pseudoephedrine HCl

Table 4

Potentiometric selectivity coefficients (K^pot.) of the six proposed sensors by using the separate solutions method.


Interferent	Sensor 1	Sensor 2	Sensor 3	Sensor 4	Sensor 5	Sensor 6

NaCl	4.51 × 10⁻³	3.67 × 10⁻³	2.14 × 10⁻⁴	3.17 × 10⁻²	3.26 × 10⁻²	4.57 × 10⁻⁴
KCl	6.47 × 10⁻³	3.43 × 10⁻³	2.25 × 10⁻⁴	4.52 × 10⁻²	3.42 × 10⁻²	5.51 × 10⁻⁴
CaCl₂	3.22 × 10⁻³	4.27 × 10⁻³	2.67 × 10⁻⁴	3.63 × 10⁻²	2.68 × 10⁻²	3.17 × 10⁻⁴
CPM	—	—	—	5.72 × 10⁻²	2.33 × 10⁻³	6.45 × 10⁻⁴
PSE	3.17 × 10⁻¹	3.89 × 10⁻²	8.77 × 10⁻³	—	—	—
IBF	6.83 × 10⁻¹	6.51 × 10⁻²	9.25 × 10⁻³	6.83 × 10⁻²	4.47 × 10⁻³	7.48 × 10⁻⁴