Dataset of surface reactions for gwb programs Dataset format: jan14 Surface type: Fr-1 Model type: freundlich Surface potential: n/a Surface capacitance: n/a Thermo dataset: thermo.tdat * * Example dataset for setting sorption described by Freundlich * isotherms. * * Follow this format to set Freundlich isotherms in a GWB run. -end- 3 surface species >Ni++ charge= 2 mole wt.= 58.7100 g 1 species in reaction 1.000 Ni++ Kf= .005 nf= .600 >Pb++ charge= 2 mole wt.= 207.2000 g 1 species in reaction 1.000 Pb++ Kf= .0025 nf= .800 >Sr++ charge= 2 mole wt.= 87.6200 g 1 species in reaction 1.000 Sr++ Kf= .010 nf= .900 -end- * * IMPORTANT NOTES: * * There are no basis species in a Freundlich model because there is no mass * balance on sorbing sites. * * The surface species are formed by sorption of ions. Enter Kf's as * linear, not logarithmic values (they are converted to log values * internally in the program). * * The Kf values are presented here in units of mol/g solid. A Kf value * represents the ratio of an ion's sorbed concentration in mol/g solid * to its free activity (not molality) in solution, the latter raised to * the Freundlich exponent, nf. In taking data from the literature, be * careful to note the units used and make the appropriate conversion, * accounting as necessary for the ion's activity coefficient and perhaps * the extent of complexation in solution.