Journal of Analytical Methods in Chemistry

Research Article

Selective Consecutive Determination of Desloratadine and Montelukast Sodium in Their Pure and Binary Dosage Form Based on Pencil Graphite Electrochemical Sensors

Table 3

Selectivity coefficients of DES- and MON-coated graphite sensors.


Interfering	DES.RNK sensor	MON.Cd. sensor	Combined sensor
	DES.RNK sensor	MON.Cd. sensor	DES	MON
	K_{DES, B}	K_{MON, B}	K_{DES, B}	K_{MON, B}

K⁺	3.7 × 10⁻³	1.6 × 10⁻³	3.3 × 10⁻³	1.4 × 10⁻³
Na⁺	4.4 × 10⁻³	3.1 × 10⁻³	4.1 × 10⁻³	3.2 × 10⁻³
NH4 ⁺	2.6 × 10⁻³	7.8 × 10⁻³	2.2 × 10⁻³	7.5 × 10⁻³
Ca²⁺	1.6 × 10⁻³	3.9 × 10⁻³	1.3 × 10⁻³	3.6 × 10⁻³
Mg²⁺	1.8 × 10⁻³	8.1 × 10⁻³	1.6 × 10⁻³	8.3 × 10⁻³
Mn²⁺	2.1 × 10⁻³	8.6 × 10⁻³	2.2 × 10⁻³	8.7 × 10⁻³
Cu²⁺	4.5 × 10⁻³	7.4 × 10⁻³	4.4 × 10⁻³	7.6 × 10⁻³
Fe²⁺	5.1 × 10⁻³	6.8 × 10⁻³	5.3 × 10⁻³	6.6 × 10⁻³
Cd²⁺	3.9 × 10⁻³	6.5 × 10⁻²	4.1 × 10⁻³	6.2 × 10⁻²
Avicel	1.9 × 10⁻³	7.1 × 10⁻³	1.5 × 10⁻³	7.3 × 10⁻³
Mg stearate	2.3 × 10⁻³	4.5 × 10⁻³	1.9 × 10⁻³	4.3 × 10⁻³
Dextrose	3.3 × 10⁻³	6.2 × 10⁻³	3.1 × 10⁻³	5.8 × 10⁻³
Desloratadine	—	1.1 × 10⁻²	—	1.3 × 10⁻²
Montelukast	1.5 × 10⁻²	—	1.2 × 10⁻²	—