Thus, it is clear that the partitioning of organic and multivalent molecules is strongly afffected by short-range interactions and charge-charge correlations, in addition to the effects which determine the partitioning of monovalent salt ions. Nevertheless, a systematic understanding of how these parameters affect the partitioning has not been fully established yet. Within the mean-field picture, the degree of ionization, α can be described by an augmented Henderson-Hasselbalch equation pH