“…(a) Absorbance vs. solutions that contain 0.7 μg/mL captopril, 2.5 mL of (100 μg/mL) solution of each of NBS and RB dye with 1 mol/L of CH3COOH, HCl, H2SO4 and HNO3, individually; (b) Absorbance vs. solutions that contain 0.7 μg/mL captopril, 2.5 mL of (100 μg/mL) solution of each of NBS and RB dye with different volumes between (0.2-1.0 mL) of 1 mol/L HCl solution. Ana, et al, 2014, Tahir, et al, 2019. The linear range was 0.3-1.0 μg/mL with correlation coefficient R 2 = 0.991 and molar absorptivity of 2333 L/mol/cm (Fig.…”