Log Kint value for bidentate surface complex was computed using Kint = a SA ns KFITEQL and values from Table 1, where a is the suspension density (kg/L), SA is the specific surface (m²/kg), ns is the site density (mol/m²), and KFITEQL is the Kint value optimized in FITEQL. The transformation relates the concentration-dependent Kint values for bidentate complexes generated by FITEQL to the mole-fraction based values [TE02].