RT Journal Article SR Electronic T1 The Adsorption of Hydroxybenzoic Acids by Poly-N-Vinyl Pyrrolidinone JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 169 OP 175 DO 10.5344/ajev.1969.20.3.169 VO 20 IS 3 A1 Randall H. Mennett A1 T. O. M. Nakayama YR 1969 UL http://www.ajevonline.org/content/20/3/169.abstract AB The Freundlich system is shown to fit adsorption of the hydroxybenzoic acids by Polyclar-AT. The system also describes removal of phenols from wine when the phenols are calculated as tannic acid. Equilibrium constants for adsorption of the hydroxybenzoic acids are obtained in order to determine the selectivity of the adsorptive process. The effect of solute acidity is also investigated.