Use of Two Sulfonphthalein Dyes for the Sensitive and Selective Extraction-Free Spectrophotometric Assay of Albendazole in Bulk Drug and in Tablets

Figure 2

Effect of reagent volume of (a) 0.05% BPB and (b) 0.1% BTB dye solution on the absorbance of ion-pair complex and blank (8 μg mL⁻¹ ALB in method A and 20 μg mL⁻¹ in method B).

(a)

(b)