DATABASE C:\Program Files\USGS\Phreeqc Interactive 2.7\wateq4f.dat
SOLUTION_SPREAD
    -units    mol/kgw
 Number	 Description	    pH	         pe	 Temperature	     Ca	     Mg	    Na	     Cl	       C	        S	       As
      	            	      	 O2(g) -0.7	            	       	       	      	 charge	        	         	 uMol/kgw
      1	       brine	 5.713	        4.0	         25.	 0.4655	 0.1609	 5.402	  6.642	 0.00396	 0.004725	     0.05
USER_PUNCH
-headings Total sorbed As
-start
10 Astot = MOL("Hfo_wHASO4-3") + MOL("Hfo_wHAsO4-") +MOL("Hfo_wH2AsO4")
20 PUNCH Astot
30 END
-end
SELECTED_OUTPUT
    -file                 OK-sorption1.sel
    -totals               Na  Ca  As
    -molalities           Hfo_wOH2+  NaX  CaX2  MgX2
                          Hfo_wOHAsO4-3  Hfo_wHAsO4-  Hfo_wH2AsO4
    -equilibrium_phases   Calcite  Dolomite
EQUILIBRIUM_PHASES 1
    Calcite   0 0.1
    Dolomite  0 1.6
SURFACE_SPECIES
Hfo_wOH + Mg+2 = Hfo_wOMg+ + H+
    log_k     -15
Hfo_wOH + Ca+2 = Hfo_wOCa+ + H+
    log_k     -15
SAVE solution 1
END
EXCHANGE 1
    X       1
    -equilibrate with solution 1
SURFACE 1
    -equilibrate with solution 1
    Hfo_w   0.07   600    30
END
SOLUTION_SPREAD
 Number	 Description	  pH	         pe	 Temperature	       Ca	       Mg	       Na	       Cl	       C	        S
      	            	    	 O2(g) -0.7	            	         	         	         	         	        	   charge
      0	    20x rain	 4.6	        4.0	         25.	 0.191625	 0.035797	 0.122668	 0.133704	 0.01096	 0.235153
EQUILIBRIUM_PHASES 2
    Calcite   0 10
    CO2(g)    -1.5 10
    Dolomite  0 10
SAVE solution 0
END
TITLE Pore volume 1
USE equilibrium_phases 1
USE exchange 1
USE solution 0
USE surface 1
SAVE equilibrium_phases 1
SAVE exchange 1
SAVE surface 1
END
TITLE Pore volume 2
USE equilibrium_phases 1
USE exchange 1
USE solution 0
USE surface 1
SAVE equilibrium_phases 1
SAVE exchange 1
SAVE surface 1
END
TITLE Pore volume 3
USE equilibrium_phases 1
USE exchange 1
USE solution 0
USE surface 1
SAVE equilibrium_phases 1
SAVE exchange 1
SAVE surface 1
END
TITLE Pore volume 4
USE equilibrium_phases 1
USE exchange 1
USE solution 0
USE surface 1
SAVE equilibrium_phases 1
SAVE exchange 1
SAVE surface 1
END