Simple Atomic Absorption Spectroscopic and Spectrophotometric Methods for Determination of Pioglitazone Hydrochloride and Carvedilol in Pharmaceutical Dosage Forms

Figure 4

Absorption spectra of (a) the reaction of 56 μgmL⁻¹ CRV with 0.4 mL of 3.3×10⁻³ M bismuth subnitrate and 0.7 mL of 0.5 M potassium iodide, (b) 0.4 mL of 3.3×10⁻³ M bismuth subnitrate and 0.7 mL of 0.5 M potassium iodide against methylene chloride, and (c) 56 μgmL⁻¹ CRV against methylene chloride.