PHREEQC Users | Resource for geochemists

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Subject / Started by	Replies / Views	Last post
Titration of Hfo Surface Using 1M NaOH Started by Nic	1 Replies 3783 Views	30/10/25 02:46 by dlparkhurst
Model arsenic sorption using Freundlich isotherm Started by aleoconn	1 Replies 5759 Views	26/09/25 05:43 by dlparkhurst
Cr adsorption onto Hfo issues Started by Amy_McBride	1 Replies 2874 Views	22/09/25 05:39 by dlparkhurst
Arsenite sorption on Goethite Started by Gunther_Schletter	2 Replies 10179 Views	29/06/25 17:20 by Gunther_Schletter
Surface complexciation Started by Anvj0705	1 Replies 6299 Views	12/06/25 16:42 by dlparkhurst
Are my Sorption Sites filled? Started by bkazamel	3 Replies 8639 Views	05/06/25 14:04 by dlparkhurst
Is it possible to modify the CD-MUSIC model and use it as the Basic Stern Model? Started by igergian	5 Replies 15007 Views	05/06/25 10:19 by Sen
Amount of water in the Diffuse Double Layer of WHAM organics? Started by peterwadeuk	3 Replies 8421 Views	05/06/25 09:01 by Sen
Why are the results obtained by changing the pH of my CD-MUSIC almost the same? Started by yisongxu	4 Replies 7280 Views	06/05/25 08:23 by yisongxu
Assistance with Defining SURFACE Keyword Datablock for TLM in PHREEQC Started by Sen	1 Replies 5709 Views	28/04/25 15:30 by dlparkhurst
Help converting Langmuir constants Started by A.Schneidt	3 Replies 6391 Views	21/04/25 23:59 by dlparkhurst
Questions regarding the use of the CD-MUSIC model Started by yisongxu	2 Replies 6134 Views	19/04/25 02:45 by yisongxu
How to build a CD-MUSIC model Started by yisongxu	2 Replies 5647 Views	16/04/25 09:02 by yisongxu
pH charge balance during transport with different surface amounts Started by Tim	2 Replies 5412 Views	29/03/25 15:46 by dlparkhurst
Surface complexion with zwitterionic Amino acids Started by A.Schneidt	5 Replies 6658 Views	26/03/25 15:06 by dlparkhurst
Query Regarding Unexpected Results in Colloidal Fe and As Simulation Started by Sen	1 Replies 5521 Views	15/12/24 18:36 by dlparkhurst
Is there a way to get EDL_Species for specific species in the diffuse layer Started by KHeppner	2 Replies 6021 Views	22/10/24 22:00 by KHeppner
Queation about EXCHANGE_MODIFY Started by Jeonghwan Hwang	1 Replies 5576 Views	10/07/24 17:32 by dlparkhurst
Use before the definition in RATES block Started by Orange	0 Replies 4847 Views	31/05/24 15:59 by Orange
Question for using Fix_H+ Started by Jeonghwan Hwang	1 Replies 4899 Views	17/05/24 17:03 by dlparkhurst
How to change the pH of Surface problem with mixing by steps from5 to 11 Started by MACAHarding	1 Replies 5126 Views	20/03/24 22:55 by dlparkhurst
Derivation of SURFACE parameters for organic carbon in an agricultural soil Started by peterwadeuk	1 Replies 5105 Views	18/01/24 17:39 by dlparkhurst
SURFACE and KINETICS Keywords Started by Rozeran	1 Replies 4991 Views	17/12/23 22:03 by dlparkhurst
Surface Complexation with gas Started by dat	5 Replies 6503 Views	23/11/23 15:52 by dlparkhurst
The capacitance value of CD-MUSIC in the “Equilibrium phases” Started by Joe	2 Replies 5572 Views	24/07/23 18:20 by Joe
Ion exchange model Started by Emile	2 Replies 5621 Views	08/06/23 16:39 by Emile
Converging error about cation exchange and surface complexation coupling model Started by Jeonghwan Hwang	7 Replies 8222 Views	07/03/23 21:10 by dlparkhurst
Three components with surface complexation Started by dat	1 Replies 4928 Views	03/03/23 15:09 by dlparkhurst
Modeling linear sorption using phreeqc Started by taa18	2 Replies 5399 Views	16/02/23 16:34 by taa18
titration of clay minerals Started by nvgroeni	3 Replies 7021 Views	02/02/23 04:20 by dlparkhurst
rate for surface complexation Started by hamiderfani	8 Replies 10232 Views	08/12/22 10:56 by dlparkhurst
How to solve ''Reaction for species has not been defined''? Started by Jin Lai	5 Replies 7274 Views	02/12/22 09:04 by Jin Lai
Surface complexation model_Effect of dosage on uranium removal Started by Francis Adu	2 Replies 5331 Views	30/11/22 15:23 by Francis Adu
How to solve "Elements in species have not been tabulated"? Started by Jeonghwan Hwang	5 Replies 9813 Views	21/10/22 15:32 by dlparkhurst
surface complexation Started by Francis Adu	4 Replies 6522 Views	08/10/22 11:12 by Francis Adu
surface complexation Started by amaury22	3 Replies 5702 Views	28/09/22 00:49 by dlparkhurst
SOLUTION_SPREAD not functioning well in my example Started by amaury22	6 Replies 6715 Views	27/09/22 14:06 by amaury22
PEST-PHREEQC Parameter Optimization Started by Francis Adu	2 Replies 5793 Views	08/09/22 19:21 by Francis Adu
Question about Saturation Index Started by Jeonghwan Hwang	4 Replies 6733 Views	10/08/22 01:06 by Jeonghwan Hwang
Uranium Adsorption Modelling Started by Francis Adu	0 Replies 4510 Views	08/07/22 15:14 by Francis Adu
surface complex reaction Started by Nlesani75	1 Replies 5014 Views	06/04/22 14:19 by dlparkhurst
Number of strong and weak adsorption centers Started by Dejavu	2 Replies 5694 Views	08/12/21 10:46 by Dejavu
Hfo_CB error when using Hfo (ferrihydrite) Started by DeanWalmsley	2 Replies 5754 Views	19/05/21 15:55 by dlparkhurst
Problem while coupling surface complexation and SIT Started by mbrandely	5 Replies 7107 Views	11/05/21 07:55 by mbrandely
Water transport and evaporation Started by FlouretAlex	2 Replies 5503 Views	19/03/21 18:29 by FlouretAlex
Estimating soil water solution Started by FlouretAlex	6 Replies 8176 Views	27/12/20 09:31 by FlouretAlex
Equilibrating identical surfaces with different solutions Started by aleoconn	2 Replies 5000 Views	23/12/20 18:46 by aleoconn
Difference between -equilibrate and USE Started by FlouretAlex	2 Replies 5392 Views	17/12/20 09:27 by FlouretAlex
Selected_output Started by rrahimi	3 Replies 5742 Views	19/11/20 16:09 by dlparkhurst
A question about SURFACE_MASTER_SPECIES Started by omarchaabi	1 Replies 5406 Views	04/10/20 16:37 by dlparkhurst
Gibbsite Surface Complexation Started by bschroth	0 Replies 4865 Views	03/09/20 17:04 by bschroth
Surface complexation modeling of silica particles Started by rrahimi	5 Replies 6644 Views	02/08/20 21:21 by dlparkhurst
SCM with CD-MUSIC in carbonate suface Started by Nlesani75	3 Replies 5994 Views	19/07/20 16:28 by dlparkhurst
Metal adsorption onto certain oxide surface using cd music Started by zye4	14 Replies 11034 Views	03/07/20 00:04 by Carlos Gallardo
Arsenic and Copper sorption by Kaolinite Started by Carlos Gallardo	2 Replies 5816 Views	02/07/20 16:18 by Carlos Gallardo
Define oil in phreeqc Started by Ala__h	1 Replies 5953 Views	27/03/20 00:03 by dlparkhurst
Is there a way to PUNCH donnan potential (psi_DL) or Boltzmann factor? Started by md.muniruzzaman	2 Replies 6616 Views	26/03/20 16:24 by md.muniruzzaman
About the exchange_species error Started by Jeonghwan Hwang	2 Replies 6874 Views	18/03/20 01:03 by Jeonghwan Hwang
Question about setting Exchange Master Species? Started by Jeonghwan Hwang	4 Replies 6990 Views	17/02/20 00:18 by Jeonghwan Hwang
Modeling the change of Aluminium in mine water Started by rudolff16	3 Replies 6555 Views	04/02/20 00:53 by dlparkhurst
Desorption model Started by Laknesh	3 Replies 6361 Views	03/02/20 09:27 by Laknesh
Question about competition Started by HFlower	3 Replies 6613 Views	21/01/20 16:53 by John Mahoney
Surface Complexation and Arsenic Adsorption Started by Pesquerj	2 Replies 7243 Views	16/01/20 00:08 by dlparkhurst
What is the unit of EXCHANGE in Cation exchange model? Started by Jeonghwan Hwang	1 Replies 6026 Views	10/01/20 15:45 by dlparkhurst
I confuse with cation exchange and surface complexation model Started by Jeonghwan Hwang	2 Replies 6605 Views	13/11/19 01:06 by Jeonghwan Hwang
Do you want to use Tipping's humic-ion binding Model VII ? (or the CCM) Started by remi_marsac	1 Replies 6591 Views	08/10/19 11:32 by Pak
Moly sorption Started by kristengault	2 Replies 6051 Views	04/09/19 22:39 by sorsbys
SURFACE Code Block - units of input Started by sorsbys	2 Replies 6642 Views	02/08/19 19:50 by sorsbys
SURFACE parameters for soil humic acids normalised to pore water volume Started by peterwadeuk	0 Replies 5565 Views	13/06/19 14:28 by peterwadeuk
WHAM humic acid model with sodium? Started by peterwadeuk	0 Replies 5704 Views	13/06/19 12:05 by peterwadeuk
Creating a surface Started by Charlie	7 Replies 9681 Views	11/06/19 01:19 by Oubai
Acid on exchanger in T&H database Started by peterwadeuk	2 Replies 6443 Views	12/03/19 18:38 by Pak
Question about the -equilibrate command Started by Pak	5 Replies 8212 Views	09/11/18 10:11 by Pak
Can't calculate the surface complexation Started by Yongqiang	5 Replies 8593 Views	03/11/18 02:48 by Yongqiang
Should I keep the pH constant!! Started by Tamirian	3 Replies 6784 Views	19/10/18 23:51 by dlparkhurst
Accounting for dissolution of pre-equilibrated SURFACE Started by bschroth	1 Replies 6073 Views	18/09/18 02:35 by dlparkhurst
Varying solid concentration for titration data Started by nvgroeni	2 Replies 6661 Views	24/08/18 17:41 by John Mahoney
Apply different methods (no_edl, diffuse_layer, cd_music) in one calculation? Started by Pak	6 Replies 8884 Views	13/07/18 08:04 by Pak
Transport model in PHAST with contaminant sorption Started by daliagrig	3 Replies 6892 Views	10/06/18 21:51 by dlparkhurst
2Goe? Started by tizzi27	1 Replies 6152 Views	28/05/18 17:05 by dlparkhurst
Sorption on soil particulate organic matter - revisited Started by peterwadeuk	0 Replies 5715 Views	04/05/18 17:04 by peterwadeuk
Call Phreeqc in PEST parameter estimation Started by Yongqiang	2 Replies 7217 Views	16/03/18 15:15 by Yongqiang
Can't output the surface potential correctly Started by Yongqiang	2 Replies 6623 Views	13/03/18 04:10 by Yongqiang
Different surfaces gives the same zeta potential!!! Started by Tamirian	1 Replies 6239 Views	07/03/18 15:47 by dlparkhurst
Using the results of the first simulation for the second one Started by Tamirian	3 Replies 7175 Views	23/02/18 03:37 by dlparkhurst
Charting problems for SCM surface potential Started by Yongqiang	2 Replies 6808 Views	19/02/18 00:35 by Yongqiang
Creating a new surface (kaolinite) Started by Tamirian	2 Replies 8959 Views	06/02/18 00:45 by Tamirian
Surface composition in Output Started by guobingbing212	2 Replies 9587 Views	01/02/18 04:10 by guobingbing212
EDL diffusion model - distribution of electric potential Started by ANar	1 Replies 5997 Views	25/01/18 15:25 by dlparkhurst
Is it possible to model zeta potential independent of ionic strength Started by Laknesh	2 Replies 6561 Views	18/01/18 01:20 by Laknesh
Cation Binding Saturating Strong Sites Started by awillou4	2 Replies 5810 Views	22/12/17 21:50 by dlparkhurst
Creating Model Curve to Match Isotherm Points Started by awillou4	2 Replies 6632 Views	22/12/17 20:11 by awillou4
Basic Stern Model in PHREEQC Started by nickjones	2 Replies 7194 Views	30/11/17 12:43 by nickjones
Questions about HFO titration Started by waynehwm	4 Replies 7633 Views	09/11/17 15:19 by waynehwm
Phreeqc + Pest data fitting problem Started by waynehwm	5 Replies 9621 Views	06/11/17 18:45 by waynehwm
V(3) Doesn't Appear to Speciate Started by awillou4	4 Replies 6838 Views	02/10/17 17:59 by awillou4
Mass Action Expressions for Bidentate Adsorption in Surface Complexation Modelin Started by Charlie	0 Replies 5011 Views	17/08/17 14:49 by Charlie
Interaction of two surface Started by Laknesh	0 Replies 5228 Views	16/08/17 10:08 by Laknesh
Failed to calculate when water inputted in solution is unsuitable Started by guobingbing212	2 Replies 6540 Views	05/08/17 04:00 by guobingbing212
Surface complex HFo and Sorption Started by rfembilejr	2 Replies 6113 Views	22/07/17 11:44 by rfembilejr
Surface Complexation Calculation Started by cmcneece	1 Replies 6430 Views	21/03/17 18:56 by dlparkhurst
punching the title Started by Luca Peruzzo	3 Replies 5206 Views	10/03/17 15:04 by dlparkhurst
Sorption on soil particulate organic matter Started by peterwadeuk	4 Replies 6328 Views	27/02/17 19:29 by peterwadeuk
questions on equilibrate vs USE function Started by Mark Himenz	1 Replies 5443 Views	24/01/17 19:25 by dlparkhurst
problem with strong and weak sites Started by somonka1	2 Replies 6176 Views	14/12/16 14:01 by somonka1
Mineral surface area in KINETIC and SURFACE Started by janethalina	1 Replies 5037 Views	28/11/16 16:24 by dlparkhurst
unit for total no. of surface sites Started by padhi	6 Replies 8064 Views	27/10/16 15:46 by dlparkhurst
Can we replace Hfo : Hydrous Ferrous oxide surface with other mineral surface.? Started by snjaykdubey	8 Replies 12831 Views	15/10/16 22:00 by dlparkhurst
normalization of binding site constants in PhreeqC at different site densities Started by SlippinJimmy	2 Replies 6200 Views	23/09/16 17:36 by SlippinJimmy
Complexation between Cr6+ and surface functional group Started by ili	2 Replies 5685 Views	14/09/16 09:58 by Charlie
model for sorption of protons on clay minerals Started by nvgroeni	1 Replies 5376 Views	20/07/16 16:07 by dlparkhurst
Parameter Optimization Driver Started by JRen	1 Replies 5390 Views	19/07/16 02:29 by dlparkhurst
Surface Complexation Model and Diffuse Layer Thickness Started by JRen	1 Replies 5429 Views	17/07/16 23:51 by dlparkhurst
High ionic strength surface complexation model Started by JRen	1 Replies 5233 Views	28/06/16 03:36 by dlparkhurst
defining SURFACE_SPECIES Started by eeftekhari	2 Replies 5760 Views	11/06/16 07:57 by eeftekhari
Surface Complexation Leaching Question Started by JRen	1 Replies 5835 Views	07/06/16 19:38 by dlparkhurst
understanding surface in phreeqc Started by tsnmaster	3 Replies 6723 Views	09/05/16 17:34 by dlparkhurst
Surface complexation Started by tsnmaster	4 Replies 7118 Views	15/04/16 21:48 by dlparkhurst
Definition of surface with fixed partition coefficient Kd Started by llanduyt	2 Replies 6826 Views	06/04/16 16:33 by llanduyt
Arsenic Sorption error Started by tsnmaster	2 Replies 6672 Views	01/12/15 02:25 by tsnmaster
Silica sorption modeling Started by Jicé	0 Replies 5308 Views	01/10/15 14:12 by Jicé
Sorption on goethite or ferrihydrite? Started by Max1	3 Replies 7348 Views	10/09/15 14:36 by dlparkhurst
Is the Surface Complexation Modules can fit the batch experiment date? Started by weird	3 Replies 7291 Views	03/07/15 12:43 by Charlie
Complexation basics Started by steven	1 Replies 5692 Views	16/06/15 20:21 by dlparkhurst
Useful resource for sorption and surface complexation data Started by Charlie	3 Replies 9957 Views	08/05/15 11:19 by snjaykdubey
Sorption and precipitation Started by Annr	2 Replies 7608 Views	08/09/14 17:39 by Annr
SURFACE input: number vs concentration of sites Started by kbelli3	3 Replies 9816 Views	12/08/14 21:32 by dlparkhurst
Mole balance and saturation concentrations Started by Charlie	4 Replies 10492 Views	14/07/14 17:23 by Charlie
Repulsion between surface complexes? Started by Charlie	1 Replies 10406 Views	09/04/14 04:10 by dlparkhurst
Review paper of mass action expressions Started by Charlie	1 Replies 11727 Views	19/03/14 10:06 by Charlie
Surface precipitation? Started by Charlie	0 Replies 9076 Views	19/03/14 10:04 by Charlie
SURFACE parameters Started by Charlie	0 Replies 11857 Views	19/03/14 09:49 by Charlie

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