PHREEQC Users | Resource for geochemists

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Subject / Started by	Replies / Views	Last post
uranium bioremediation in situ experiment Started by Juliannie_Cerda	1 Replies 1706 Views	04/04/26 01:02 by dlparkhurst
Adding solid phases during kinetic reactions Started by Rensburg	14 Replies 5962 Views	26/02/26 16:25 by Rensburg
Convergence Issues in PHREEQC at Elevated Temperatures Started by Jeonghwan Hwang	3 Replies 4346 Views	13/02/26 18:34 by dlparkhurst
single phase precipitation Started by Hamed	2 Replies 5843 Views	21/01/26 00:18 by dlparkhurst
User manual example two giving a different result from the manual Started by AnotherSLGuy	4 Replies 15737 Views	16/11/25 11:06 by AnotherSLGuy
model with SI H2S:0 Started by joserevueltas94	3 Replies 12812 Views	23/10/25 23:40 by dlparkhurst
Mineral Weathering in Air Started by jh3919	1 Replies 10041 Views	17/10/25 15:42 by dlparkhurst
salt precipitaion Started by Hamed	3 Replies 19856 Views	31/07/25 23:14 by dlparkhurst
Gas phase volume Started by Hamed	1 Replies 13339 Views	30/07/25 19:57 by dlparkhurst
Activity calculations Started by robertaasa	1 Replies 14092 Views	24/07/25 14:53 by dlparkhurst
Appropriate gas volume assumption for water exposed to atmosphere Started by AnotherSLGuy	3 Replies 15784 Views	28/05/25 14:50 by dlparkhurst
Fe solubility diagram Started by shellaarinda10	2 Replies 14009 Views	16/05/25 16:54 by shellaarinda10
Negative Alkalinity Modelling Started by Idoboro	1 Replies 14214 Views	05/05/25 13:21 by dlparkhurst
Very high CO2 solubility in NaHCO3 and Na2CO3 solutions Started by jalil	3 Replies 14828 Views	23/01/25 23:25 by dlparkhurst
Halite aquifer and Brine Started by DFhidro	3 Replies 14912 Views	30/12/24 21:47 by dlparkhurst
Tailing dissolution: AsH3 and H2S Started by nesa	2 Replies 14099 Views	01/12/24 03:37 by nesa
Solubility Modeling in open system adjusted to high pH Started by bschroth	6 Replies 15801 Views	26/11/24 19:00 by bschroth
Modelling Solubility of Lithium Carbonate Started by mdannyjunior	2 Replies 13692 Views	01/10/24 17:39 by mdannyjunior
Speciation with different partial pressure of oxygen Started by Moji	3 Replies 13102 Views	21/09/24 15:04 by dlparkhurst
Equilibrim - Isotopes (SO4 and H2O) Started by fcgarcia	2 Replies 14228 Views	20/08/24 16:52 by dlparkhurst
Alkalinity balance Started by GeeqC	15 Replies 20814 Views	06/08/24 17:44 by dlparkhurst
Batch reactor equilibria liquid/gas Started by gdavilao	3 Replies 13080 Views	12/07/24 19:59 by dlparkhurst
S has not converged Started by Jeonghwan Hwang	3 Replies 13236 Views	24/06/24 16:50 by dlparkhurst
Distribution of species for H2 Started by Hamed	1 Replies 11869 Views	17/06/24 15:31 by dlparkhurst
Calculated Total Alkalinity in brine completely different than measured Started by Idoboro	0 Replies 11606 Views	15/05/24 10:51 by Idoboro
Water-Rock-Equilibration - Input Moles out of XRD analysis (wt%) Started by AMa	5 Replies 15974 Views	08/05/24 00:04 by dlparkhurst
How to fix DH in simulation Started by qindw	4 Replies 13728 Views	21/03/24 04:12 by qindw
How to model simple solution in equil. w/ atmospheric CO2, N2, O2? Started by jheadley	1 Replies 13204 Views	09/03/24 18:31 by dlparkhurst
Calcite equilibrium with low pH solution Started by Hamed	4 Replies 13411 Views	08/02/24 23:12 by Hamed
The water-rock reaction of granite，Reduced SiO2 content Started by duanjiabin	2 Replies 16577 Views	23/12/23 10:32 by duanjiabin
I adjusted the equilibrium constant, but the result does not show the Cs+ Started by duanjiabin	2 Replies 11744 Views	21/12/23 06:25 by duanjiabin
Bubbling point of NCGs (CO2) in geothermal wellbore Started by FreakQC	4 Replies 13589 Views	14/07/23 07:38 by FreakQC
DIC concentrations under fixed pCO2 and increasing pressure Started by thrbnmnn	2 Replies 11734 Views	26/06/23 09:49 by thrbnmnn
Pyrite formation from ferric (Fe+3) and hydrogen sulfide (HS-) Started by ahmadreza_shojaee	5 Replies 14414 Views	12/06/23 16:03 by dlparkhurst
Limitations for low initial concentrations Started by plechacek	3 Replies 15014 Views	01/03/23 01:27 by dlparkhurst
Question about adding Exchange and Surface in previous modeling results Started by Jeonghwan Hwang	2 Replies 13094 Views	02/09/22 04:16 by Jeonghwan Hwang
How is the pH calculated when equlibrium with atmospheric CO2? Started by jiasg	2 Replies 13211 Views	08/07/22 03:41 by jiasg
How to make the condition of constant pCO2 in solution? Started by Jeonghwan Hwang	1 Replies 13124 Views	09/09/21 03:29 by dlparkhurst
Unexpected output in distribution of species section Started by Marino Vetuschi Zuccolini	4 Replies 14676 Views	09/02/21 21:38 by Marino Vetuschi Zuccolini
Equilibrating exchange with pure water Started by FlouretAlex	2 Replies 12585 Views	31/10/20 11:48 by FlouretAlex
phreeqc zeta potential Started by Nlesani75	1 Replies 14369 Views	28/07/20 19:04 by dlparkhurst
Initial concentration, portlandite leaching Started by daliagrig	8 Replies 16746 Views	06/06/20 21:45 by dlparkhurst
PHREEQC change EQUILIBRIUM_PHASES between TRANSPORT runs? Started by peterwadeuk	2 Replies 13041 Views	04/06/20 15:39 by peterwadeuk
Precipitation at Equilibrium Started by lourdsa	1 Replies 13708 Views	02/09/19 18:35 by John Mahoney
Water activity equation Started by IliasBouchkira	2 Replies 15013 Views	19/07/19 15:19 by IliasBouchkira
Element based input definition and water mass balance Started by amargert	5 Replies 14741 Views	01/07/19 16:08 by amargert
Keq at unkown temperature Started by IliasBouchkira	1 Replies 12249 Views	25/06/19 16:55 by dlparkhurst
LK_PHASE in basic interpreter Started by nnegash	2 Replies 12616 Views	31/05/19 13:50 by nnegash
Convergence error in simulation Started by Sol-Chan Han	6 Replies 17000 Views	29/11/18 12:33 by Sol-Chan Han
Mineral Equilibrium calculation Started by Sol-Chan Han	11 Replies 22037 Views	26/10/18 02:57 by dlparkhurst
Moles of H2O with high precision when modeling evaporation to NaCl precip. start Started by MichaelZ20	4 Replies 15253 Views	24/07/18 08:23 by MichaelZ20
Percentage of HCO3- of total dissolved carbonate Started by Hydroman	2 Replies 17527 Views	24/04/18 10:05 by Hydroman
Precipitation at equilibrium Started by hmal	3 Replies 20085 Views	16/02/18 00:26 by hmal
Solid solutions Started by hmal	4 Replies 19192 Views	21/01/18 23:40 by hmal
Sepiolite SI and precipitate Started by isaacrojas	1 Replies 15316 Views	30/06/17 03:02 by dlparkhurst
Carbonate system Started by docla	1 Replies 17748 Views	29/03/17 19:51 by dlparkhurst
Corrosion risk / Solution equilibrium Started by AAN	1 Replies 14639 Views	17/12/15 21:14 by dlparkhurst
S(-2) speciation Started by Szasza	1 Replies 13974 Views	12/08/15 13:42 by dlparkhurst
H2S equilibria Started by sevy	4 Replies 23955 Views	21/08/14 00:41 by dlparkhurst

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