3.3 NaOH concentration
The acceptor solution, which removes the target phenolic compounds from the n-octanol phase, ought to be alkaline. This solution should ionize the phenolic compounds and maximize their solubility in the aqueous medium. Aqueous NaOH solutions have found application as acceptor solutions for the LPME of phenolic compounds [9], [12], [13], [24] and [27]. Fig. 3 shows how NaOH concentrations between 0.01 and 0.60 mol L−1 influenced the microextraction proces…