webmaster Posted November 5, 2004 Share Posted November 5, 2004 From: Criscenti, Louise J Subject: GWB & X2t - Kds I have a question regarding the calculating local Kds after using a surface complexation model to distribute a contaminant (e.g., Uranium) between the solid and aqueous phases. The “Uranium in Sorbate� can be plotted in “mg/kg�. The “Uranium in Fluid� can also be plotted as “mg/kg�. A Kd is strictly defined as the (mass of solute sorbed per dry unit weight of solid in mg/kg) divided by (concentration of solute in solution in equilibrium with the mass of solute sorbed onto the solid (mg/L). Is the Uranium in Sorbate plotted in mg/kg, plotted in mg per kg of fluid? mg/(kg of dry solid)? mg/(kg of solid+fluid?)? From: Craig Bethke Subject: Re: GWB & X2t - Kds In Gtplot and Xtplot, you are plotting concentrations, not KDs, so the unit conversion options (molal, mg/kg, ...) all refer to mass per unit solution or solvent mass. You can check yourself, of course: just take the component mass and divide it by solution mass, and rock mass. The answer should match the former. Quote Link to comment Share on other sites More sharing options...
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