interval start at 0 day, fluid = infilter time end at 30 day length = 10 m Nx = 40 discharge = 18 cm/day scope = initial Ca++ = 4 mmol/kg pH = 9 swap Calcite for HCO3- Calcite = 70 free volume% balance on Cl- scope = infilter Ca++ = .01 mmol/kg pH = 4 swap CO2(g) for HCO3- CO2(g) = -3.5 log fugacity balance on Cl- scope kinetic Calcite rate_law = eqn "Wmass * 1.33e-10 * (1 - Q/K)" segregate Calcite scope = initial carbon-13 initial = -5, Calcite = 1 scope = infilter carbon-13 initial = -22 scope