Use of Alizarin Red S as an Ion-Pair Reagent for the Spectrophotometric Assay of Fexofenadine in Pharmaceuticals and in Spiked Human Urine

Table 2

Effect of the extracting solvent on absorbance of the formed ion-pair complex^a.

Solvent	𝐴blank	𝐴ion-pair
Chloroform	0.030	0.403
1,2-dichloroethane	0.039	0.368
Dichloromethane	0.028	0.435

^aConcentration of FFH is 6 μg mL⁻¹.