Hydrochloric acid (HCl) and sodium hydroxide (NaOH), two examples of analytical-grade chemical reagents, were purchased from POCh in Gliwice, Poland. Analytical-grade organic reagents, i.e., methyl-2-(4-acetylphenoxy)acetate, cellulose triacetate (CTA, molecular weight Mw = 72.000–74.000), o-nitrophenyl octyl ether (o-NPOE), and dichloromethane (CH2Cl2) (all from Merck Life Science Sp.z.o.o., Poznan, Poland), were used without further purification. Methylene blue (MB) dye was purchased from Chempur (Krupski Mlyn, Poland). Deionized water (conductivity, 0.10 μS/cm) and analytical-reagent-grade chemicals were used in the production of all aqueous solutions.
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