Table 3: Optical characteristics of Ambroxol Hydrochloride and Cetirizine Hydrochloride.

Optical characteristicsAmbroxol HydrochlorideCetirizine Hydrochloride

(nm)244230
Beer-Lambert’s law limit (µg/mL)2–182–20
Regression equation ( )
Slope ( )0.0250.032
Intercept ( )0.0020.011
Correlation coefficient ( )0.9990.999
LOD (µg/mL)0.4500.457
LOQ (µg/mL)1.4241.386
Precision (%RSD)
Repeatability0.4520.381
Intraday0.3740.416
Interday0.9420.863