Fig. 4From: The simultaneous measurement of quaternary mixture in over-the-counter cold medications using sequential spectrophotometric resolution approach enhanced with in-lab sample enrichmentDivision spectra of lab-mixtures; (a) PAR (15 µg/mL), (b) CAF (20 µg/mL), and (c) DOX (50 µg/mL) as divisors, respectivelyBack to article page