Simple Spectrophotometric Method for Determination of Paroxetine in Tablets Using 1,2-Naphthoquinone-4-Sulphonate as a Chromogenic Reagent

Figure 5

Job’s plot for determination of stoichiometry of the reaction between PRX and NQS. [PRX]: 5×10⁻³ M; [NQS]: 5×10⁻³ M; [PRX]+[NQS]: 1 mL; Clark and Lubs buffer solution (pH 9): 1 mL; temperature: 25 ± 5^∘C; reaction time: 10 minutes.