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GSA first-order indices (Si) for the prediction of the Freundlich parameters for cations and zwitterions. Abbreviations: carbon content (C, %), molar ratios H/C and O/C, SSA (m2/g), amount of ionized negatively charged species (A–, %), amount of ionized positively charged species (B+, %), E (excess molar refraction), S (dipolarity/polarizability), A (H-bond acidity), B (H-bond basicity), and V (molar volume).
