surface_data = Langmuir2.dat
pH = 8.3
Cl-   = 19000 mg/kg
Ca++  =   400 mg/kg
Sr++  =    10 mg/kg
Mg++  =  1300 mg/kg
Na+   = 10700 mg/kg
K+    =   400 mg/kg
SO4-- =  2700 mg/kg
exchange_cap = 0.01 moles
go