DATABASE C:\Program Files\USGS\Phreeqc Interactive 2.7\phreeqc.dat
PHASES
OC
    CH2O = 0.5 CO2 + 0.5CH4
    log_k     0
INVERSE_MODELING 1
    -solutions      1        4
    -uncertainty    0.1      0.1
    -phases
        Calcite           pre
        Dolomite          dis
        Fe(OH)3(a)        dis
        Anhydrite         dis
        Pyrite            pre
        CO2(g)
        CaX2
        NaX
        OC                dis
        Halite
        Celestite
        Chalcedony
        KX
    -tolerance         1e-010
    -mineral_water     true
SOLUTION_SPREAD														
 -units mg/L														
Description	Number	  Temp	    pH	 O(0)	  Ca	  Mg	Na	K	 Alkalinity	   Cl	 S(6)	  Si	Sr	S(-2)
														as H2S
1.1	1	24.7	7.76	0	38	8.1	4	0.8	143.9	6.9	12	13	0.081	0
2.4	4	31.5	7.45	0	100	52	12	2.9	176.1	14	340	21	24	1.92
2.6	6	27.2	7.48	0	114	79	265	17	177.5	412	180	19	15.3	2.6
SELECTED_OUTPUT
    -file                 florida.sel
    -inverse_modeling     true
END