SherbyNet - /page/wikibook/entry.mu

Micron Document

<!DOCTYPE html>

<title>Geochemical modeling</title>

</head>

Geochemical modeling

</h1>

</header>

<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr">Geochemical modeling or theoretical geochemistry is the practice of using <a href="Chemical_thermodynamics" title="Chemical thermodynamics">chemical thermodynamics</a>, <a href="Chemical_kinetics" title="Chemical kinetics">chemical kinetics</a>, or both, to analyze the <a href="Chemical_reactions" class="mw-redirect" title="Chemical reactions">chemical reactions</a> that affect <a href="Geology" title="Geology">geologic systems</a>, commonly with the aid of a computer. It is used in high-temperature <a href="Geochemistry" title="Geochemistry">geochemistry</a> to simulate reactions occurring deep in the Earth's interior, in <a href="Magma" title="Magma">magma</a>, for instance, or to model low-temperature reactions in <a href="Aqueous_solutions" class="mw-redirect" title="Aqueous solutions">aqueous solutions</a> near the Earth's surface, the subject of this article.

<div class="mw-heading mw-heading2"><h2 id="Applications_to_aqueous_systems">Applications to aqueous systems</h2></div>

Geochemical modeling is used in a variety of fields, including environmental <a href="Environmental_protection" title="Environmental protection">protection</a> and <a href="Environmental_remediation" title="Environmental remediation">remediation</a>,<a href="#cite_note-1">[1]</a> the <a href="Petroleum_industry" title="Petroleum industry">petroleum industry</a>, and <a href="Economic_geology" title="Economic geology">economic geology</a>.<a href="#cite_note-GBRM-2">[2]</a> Models can be constructed, for example, to understand the composition of natural waters; the mobility and breakdown of <a href="Pollution" title="Pollution">contaminants</a> in flowing <a href="Groundwater" title="Groundwater">groundwater</a> or <a href="Surface_water" title="Surface water">surface water</a>; the <a href="Ion_speciation" title="Ion speciation">ion speciation</a> of <a href="Plant_nutrients_in_soil" title="Plant nutrients in soil">plant nutrients in soil</a> and of <a href="Heavy_metals" title="Heavy metals">regulated metals</a> in <a href="Waste_management" title="Waste management">stored solid wastes</a>; the formation and dissolution of rocks and <a href="Minerals" class="mw-redirect" title="Minerals">minerals</a> in geologic formations in response to injection of industrial wastes, steam, or <a href="Carbon_sequestration" title="Carbon sequestration">carbon dioxide</a>; the dissolution of carbon dioxide in seawater and its effect on <a href="Ocean_acidification" title="Ocean acidification">ocean acidification</a>; and the generation of <a href="Acid_mine_drainage" title="Acid mine drainage">acidic waters</a> and leaching of metals from mine wastes.

For instance, geochemical modeling of aqueous systems also indicates that, under underground conditions for large ammonia geo-storage, there is typically no significant change in the rock mass. Injecting ammonia into deep porous rocks at specific temperature and pressure conditions has a negligible dissolution effect. This insight, obtained through geochemical simulation and modeling and shows its potential for the research area.<a href="#cite_note-3">[3]</a>

<div class="mw-heading mw-heading2"><h2 id="Development_of_geochemical_modeling">Development of geochemical modeling</h2></div>

<a href="Robert_Garrels" title="Robert Garrels">Garrels</a> and Thompson (1962) first applied chemical modeling to geochemistry in 25 °C and one atmosphere total pressure. Their calculation, computed by hand, is now known as an equilibrium model, which predicts species distributions, mineral saturation states, and gas fugacities from measurements of bulk solution composition. By removing small aliquots of <a href="Solvent" title="Solvent">solvent</a> water from an equilibrated spring water and repeatedly recalculating the species distribution, Garrels and Mackenzie (1967) simulated the reactions that occur as spring water evaporated.<a href="#cite_note-4">[4]</a> This coupling of mass transfer with an equilibrium model, known as a reaction path model, enabled geochemists to simulate reaction processes.

<a href="Harold_C._Helgeson" class="mw-redirect" title="Harold C. Helgeson">Helgeson</a> (1968) introduced the first computer program to solve equilibrium and reaction path models,<a href="#cite_note-5">[5]</a> which he and coworkers used to model geological processes like <a href="Weathering" title="Weathering">weathering</a>, sediment <a href="Diagenesis" title="Diagenesis">diagenesis</a>, <a href="Evaporation" title="Evaporation">evaporation</a>, <a href="Hydrothermal_alteration" class="mw-redirect" title="Hydrothermal alteration">hydrothermal alteration</a>, and <a href="Ore_genesis" title="Ore genesis">ore deposition</a>.<a href="#cite_note-6">[6]</a> Later developments in geochemical modeling included reformulating the governing equations, first as <a href="Ordinary_differential_equations" class="mw-redirect" title="Ordinary differential equations">ordinary differential equations</a>, then later as <a href="Algebraic_equations" class="mw-redirect" title="Algebraic equations">algebraic equations</a>. Additionally, <a href="Component_(thermodynamics)" title="Component (thermodynamics)">chemical components</a> came to be represented in models by aqueous species, minerals, and gases, rather than by the elements and electrons which make up the species, simplifying the governing equations and their numerical solution.<a href="#cite_note-GBRM-2">[2]</a>

Recent improvements in the power of personal computers and <a href="#Software_programs_in_common_use">modeling software</a> have made geochemical models more accessible and more flexible in their implementation.<a href="#cite_note-7">[7]</a> Geochemists are now able to construct on their laptops complex reaction path or <a href="Reactive_transport_modeling_in_porous_media" title="Reactive transport modeling in porous media">reactive transport models</a> which previously would have required a supercomputer.<a href="#cite_note-8">[8]</a>

<div class="mw-heading mw-heading2"><h2 id="Setting_up_a_geochemical_model">Setting up a geochemical model</h2></div>

An aqueous system is uniquely defined by its chemical composition, <a href="Temperature" title="Temperature">temperature</a>, and <a href="Pressure" title="Pressure">pressure</a>.<a href="#cite_note-Anderson-9">[9]</a> Creating geochemical models of such systems begins by choosing the basis, the set of <a href="Chemical_species" title="Chemical species">aqueous species</a>, <a href="Minerals" class="mw-redirect" title="Minerals">minerals</a>, and <a href="Gases" class="mw-redirect" title="Gases">gases</a> which are used to write chemical reactions and express composition. The number of basis entries required equals the number of <a href="Component_(thermodynamics)" title="Component (thermodynamics)">components</a> in the system, which is fixed by the <a href="Gibbs'_phase_rule" class="mw-redirect" title="Gibbs' phase rule">phase rule</a> of thermodynamics. Typically, the basis is composed of water, each mineral in equilibrium with the system, each gas at known <a href="Fugacity" title="Fugacity">fugacity</a>, and important aqueous species. Once the basis is defined, a modeler can solve for the <a href="Chemical_equilibrium" title="Chemical equilibrium">equilibrium state</a>, which is described by <a href="Law_of_mass_action" title="Law of mass action">mass action</a> and mass balance equations for each component.<a href="#cite_note-GBRM-2">[2]</a>

In finding the equilibrium state, a geochemical modeler solves for the distribution of mass of all species, minerals, and gases which can be formed from the basis. This includes the <a href="Activity_(chemistry)" class="mw-redirect" title="Activity (chemistry)">activity</a>, <a href="Activity_coefficient" title="Activity coefficient">activity coefficient</a>, and <a href="Concentration" title="Concentration">concentration</a> of aqueous species, the <a href="Solution_(chemistry)" title="Solution (chemistry)">saturation</a> state of minerals, and the fugacity of gases. Minerals with a saturation index (log Q/K) equal to zero are said to be in equilibrium with the fluid. Those with positive saturation indices are termed <a href="Supersaturation" title="Supersaturation">supersaturated</a>, indicating they are favored to precipitate from solution. A mineral is undersaturated if its saturation index is negative, indicating that it is favored to dissolve.<a href="#cite_note-Anderson-9">[9]</a>

Geochemical modelers commonly create reaction path models to understand how systems respond to changes in composition, temperature, or pressure. By configuring the manner in which mass and heat transfer are specified (i.e., open or closed systems), models can be used to represent a variety of geochemical processes. Reaction paths can assume chemical equilibrium, or they can incorporate kinetic rate laws to calculate the timing of reactions. In order to predict the distribution in space and time of the chemical reactions that occur along a flowpath, geochemical models are increasingly being coupled with <a href="Groundwater_model" title="Groundwater model">hydrologic models</a> of mass and heat transport to form <a href="Reactive_transport_modeling_in_porous_media" title="Reactive transport modeling in porous media">reactive transport models</a>.<a href="#cite_note-GBRM-2">[2]</a> Specialized geochemical modeling programs that are designed as cross-linkable re-entrant software objects enable construction of reactive transport models of any flow configuration.<a href="#cite_note-10">[10]</a>

<div class="mw-heading mw-heading2"><h2 id="Types_of_reactions">Types of reactions</h2></div>

Geochemical models are capable of simulating many different types of <a href="Chemical_reaction" title="Chemical reaction">reactions</a>. Included among them are:

<ul><li><a href="Acid-base_reactions" class="mw-redirect" title="Acid-base reactions">Acid-base reactions</a></li>

<li><a href="Coordination_complex" title="Coordination complex">Aqueous complexation</a></li>

<li>Mineral <a href="Dissolution_(chemistry)" class="mw-redirect" title="Dissolution (chemistry)">dissolution</a> and <a href="Precipitation_(chemistry)" title="Precipitation (chemistry)">precipitation</a>, including <a href="Ostwald_ripening" title="Ostwald ripening">Ostwald ripening</a></li>

<li>Reduction and oxidation (<a href="Redox" title="Redox">redox</a>) reactions, including those catalyzed by <a href="Enzyme" title="Enzyme">enzymes</a>, <a href="Reactions_on_surfaces" title="Reactions on surfaces">surfaces</a>, and <a href="Microorganism" title="Microorganism">microorganisms</a></li>

<li><a href="Adsorption" title="Adsorption">Sorption</a>, <a href="Ion_exchange" title="Ion exchange">ion exchange</a>, and surface complexation</li>

<li>Gas dissolution and <a href="Degasification" class="mw-redirect" title="Degasification">exsolution</a></li>

<li><a href="Stable_isotope" class="mw-redirect" title="Stable isotope">Stable isotope fractionation</a></li>

<li><a href="Radioactive_decay" title="Radioactive decay">Radioactive decay</a></li></ul>

Simple <a href="Phase_diagrams" class="mw-redirect" title="Phase diagrams">phase diagrams</a> or plots are commonly used to illustrate such geochemical reactions. Eh-pH <a href="Pourbaix_diagram" title="Pourbaix diagram">(Pourbaix)</a> diagrams, for example, are a special type of activity diagram which represent acid-base and redox chemistry graphically.

<div class="mw-heading mw-heading2"><h2 id="Uncertainties_in_geochemical_modelling">Uncertainties in geochemical modelling</h2></div>

Various sources can contribute to a range of simulation results. The range of the simulation results is defined as model uncertainty. One of the most important sources not possible to quantify is the conceptual model, which is developed and defined by the modeller. Further sources are the parameterization of the model regarding the hydraulic (only when simulating transport) and mineralogical properties.<a href="#cite_note-11">[11]</a> The parameters used for the geochemical simulations can also contribute to model uncertainty. These are the applied thermodynamic database and the parameters for the kinetic minerals dissolution.<a href="#cite_note-12">[12]</a> Differences in the thermodynamic data (i.e. equilibrium constants, parameters for temperature correction, activity equations and coefficients) can result in large uncertainties. Furthermore, the large spans of experimentally derived rate constants for minerals dissolution rate laws can cause large variations in simulation results. Despite this is well-known, uncertainties are not frequently considered when conducting geochemical modelling.<a href="#cite_note-:0-13">[13]</a>

Reducing uncertainties can be achieved by comparison of simulation results with experimental data, although experimental data does not exist at every temperature-pressure condition and for every chemical system.<a href="#cite_note-:0-13">[13]</a> Although such a comparison or calibration can not be conducted consequently the geochemical codes and thermodynamic databases are state-of-the-art and the most useful tools for predicting geochemical processes.

<div class="mw-heading mw-heading2"><h2 id="Software_programs_in_common_use">Software programs in common use</h2></div>

<ul><li><a href="Aqion" title="Aqion">Aquion</a></li>

<li><a rel="nofollow" class="external text" href="https://www.eawag.ch/en/department/surf/projects/chemeql/">ChemEQL</a><a href="#cite_note-14">[14]</a></li>

<li><a rel="nofollow" class="external text" href="https://chemplugin.gwb.com/">ChemPlugin</a></li>

<li><a rel="nofollow" class="external text" href="http://chess.geosciences.ensmp.fr/home/view?set_language=en">CHESS</a>,<a href="#cite_note-15">[15]</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20140719094056/http://hr.geosciences.ensmp.fr/modelisation/hytec">HYTEC</a></li>

<li>CHILLER,<a href="#cite_note-16">[16]</a> CHIM-XPT</li>

<li><a rel="nofollow" class="external text" href="https://bitbucket.org/crunchflow/crunchtope-dev/wiki/Home">CrunchFlow</a><a href="#cite_note-17">[17]</a><a href="#cite_note-18">[18]</a></li>

<li><a rel="nofollow" class="external text" href="http://www.plantmineralnutrition.net/software/geochem_ez/index.html">GEOCHEM-EZ</a><a href="#cite_note-21">[21]</a></li>

<li><a href="The_Geochemist's_Workbench" title="The Geochemist's Workbench">The Geochemist's Workbench</a><a href="#cite_note-22">[22]</a></li>

<li><a rel="nofollow" class="external text" href="https://gibbsstudio.io">GibbsStudio</a></li>

<li><a rel="nofollow" class="external text" href="http://community.gwb.com/community_overview.php">GWB Community Edition</a></li>

<li><a rel="nofollow" class="external text" href="http://www.stormwater.ucf.edu/research/yeh_publications/HYDROGEOCHEM_5-0.pdf">HYDROGEOCHEM</a><a href="#cite_note-23">[23]</a></li>

<li><a rel="nofollow" class="external text" href="http://www.mineql.com/">MINEQL+</a><a href="#cite_note-24">[24]</a><a href="#cite_note-25">[25]</a></li>

<li><a rel="nofollow" class="external text" href="https://archive.today/20121212100732/http://www.epa.gov/ceampubl/mmedia/minteq/">MINTEQA2</a><a href="#cite_note-26">[26]</a></li>

<li>ORCHESTRA<a href="#cite_note-27">[27]</a></li>

<li><a rel="nofollow" class="external text" href="https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/">PHREEQC</a><a href="#cite_note-28">[28]</a><a href="#cite_note-29">[29]</a></li>

<li><a rel="nofollow" class="external text" href="http://reaktoro.org/">Reaktoro</a><a href="#cite_note-30">[30]</a></li>

<li><a rel="nofollow" class="external text" href="http://www.telusplanet.net/public/geogams/products/default.html">SOLMINEQ.88, GAMSPATH.99</a><a href="#cite_note-31">[31]</a></li>

<li><a rel="nofollow" class="external text" href="https://tough.lbl.gov/software/toughreact/">TOUGHREACT</a><a href="#cite_note-32">[32]</a></li>

<li><a rel="nofollow" class="external text" href="https://vminteq.lwr.kth.se/">Visual MINTEQ</a><a href="#cite_note-33">[33]</a></li>

<li><a rel="nofollow" class="external text" href="https://wwwbrr.cr.usgs.gov/projects/GWC_chemtherm/software.htm">WATEQ4F</a><a href="#cite_note-34">[34]</a></li>

<li><a rel="nofollow" class="external text" href="https://worm-portal.asu.edu/">Water-Organic-Rock-Microbe (WORM) Portal</a><a href="#cite_note-35">[35]</a></li>

The <a rel="nofollow" class="external text" href="https://water.usgs.gov/software/lists/geochemical">USGS website</a> provides free access to many of the software listed above. <a href="#cite_note-37">[37]</a>

<ul><li><a href="Chemical_thermodynamics" title="Chemical thermodynamics">Chemical thermodynamics</a></li>

<li><a href="Chemical_kinetics" title="Chemical kinetics">Chemical kinetics</a></li>

<li><a href="Geochemistry" title="Geochemistry">Geochemistry</a></li>

<li><a href="Geomicrobiology" title="Geomicrobiology">Geomicrobiology</a></li>

<li><a href="Hydrogeology" title="Hydrogeology">Hydrogeology</a></li>

<li><a href="Groundwater_model" title="Groundwater model">Groundwater model</a></li>

<li><a href="Reactive_transport_modeling_in_porous_media" title="Reactive transport modeling in porous media">Reactive transport model</a></li>

<li><a href="Reservoir_simulation" title="Reservoir simulation">Reservoir simulation</a></li>

<li><a href="Chemical_process_modeling" title="Chemical process modeling">Chemical process modeling</a></li>

<li><a href="Chemical_transport_model" title="Chemical transport model">Chemical transport model</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>

<ul><li>Appelo, C.A.J. and D. Postma, 2005, Geochemistry, Groundwater, and Pollution. Taylor & Francis, 683 pp. <style data-mw-deduplicate="TemplateStyles:r1238218222">

/* start https://en.wikipedia.org/ */

.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("./mw/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("./mw/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("./mw/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("./mw/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}

/* end https://en.wikipedia.org/ */

</style><a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0415364287</bdi></li>

<li>Bethke, C.M., 2008, Geochemical and Biogeochemical Reaction Modeling. Cambridge University Press, 547 pp. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0521875547</bdi></li>

<li>Merkel, B.J., B. Planer-Friedrich, and D.K. Nordstrom, 2008, Groundwater Geochemistry: A Practical Guide to Modeling of Natural and Contaminated Aquatic Systems. Springer, 242 pp. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-3540746676</bdi></li>

<li>Oelkers, E.H. and J. Schott (eds.), 2009, Thermodynamics and Kinetics of Water-Rock Interaction. Reviews in Mineralogy and Geochemistry 70, 569 pp. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0-939950-84-3</bdi></li>

<li>Zhu, C. and G. Anderson, 2002, Environmental Applications of Geochemical Modeling. Cambridge University Press, 300 pp. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>978-0521005777</bdi></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

/* start https://en.wikipedia.org/ */

.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}

/* end https://en.wikipedia.org/ */

</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;">

<li id="cite_note-1"><a href="#cite_ref-1">^</a> Zhu, C. and G. Anderson, 2002, Environmental Applications of Geochemical Modeling. Cambridge University Press, 300 pp.

</li>

<li id="cite_note-GBRM-2">^ <a href="#cite_ref-GBRM_2-0">a</a> <a href="#cite_ref-GBRM_2-1">b</a> <a href="#cite_ref-GBRM_2-2">c</a> <a href="#cite_ref-GBRM_2-3">d</a> Bethke, C.M., 2008, Geochemical and Biogeochemical Reaction Modeling. Cambridge University Press, 547 pp.

</li>

<li id="cite_note-3"><a href="#cite_ref-3">^</a> <cite id="CITEREFKarimzadehMahaniAyatollahi2025" class="citation journal cs1">Karimzadeh, Hadi; Mahani, Hassan; Ayatollahi, Shahab (2025). <a rel="nofollow" class="external text" href="https://doi.org/10.1016/j.geoen.2025.213906">"Geo-storage of ammonia as an energy carrier: A review on the opportunities and challenges"</a>. Geoenergy Science and Engineering. 252 213906. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.geoen.2025.213906">10.1016/j.geoen.2025.213906</a>.</cite>

</li>

<li id="cite_note-4"><a href="#cite_ref-4">^</a> Garrels, R.M. and F.T. Mackenzie, 1967, Origin of the chemical compositions of some springs and lakes. Equilibrium Concepts in Natural Waters, Advances in Chemistry Series 67, American Chemical Society, Washington, DC, pp. 222-242

</li>

<li id="cite_note-5"><a href="#cite_ref-5">^</a> Helgeson, H.C., 1968, Evaluation of irreversible reactions in geochemical processes involving minerals and aqueous solutions, I. Thermodynamic relations. Geochemica et Cosmochimica Acta 32, 853-877

</li>

<li id="cite_note-6"><a href="#cite_ref-6">^</a> Helgeson, H.C., R.M. Garrels and F.T. Mackenzie, 1969, Evaluation of irreversible reactions in geochemical processes involving minerals and aqueous solutions, II. Applications. Geochemica et Cosmochimica Acta 33, 455-481

</li>

<li id="cite_note-7"><a href="#cite_ref-7">^</a> Zhu, C., 2009, Geochemical Modeling of Reaction Paths and Geochemical Reaction Networks. In E.H. Oelkers and J. Schott(eds.), 2009, Thermodynamics and Kinetics of Water-Rock Interaction. Reviews in Mineralogy and Geochemistry 70, 533-569

</li>

<li id="cite_note-8"><a href="#cite_ref-8">^</a> Brady, P.V. and C.M. Bethke, 2000, Beyond the Kd approach. Ground Water 38, 321-322

</li>

<li id="cite_note-Anderson-9">^ <a href="#cite_ref-Anderson_9-0">a</a> <a href="#cite_ref-Anderson_9-1">b</a> Anderson, G.M. 2009, Thermodynamics of Natural Systems. Cambridge University Press, 664 pp.

</li>

<li id="cite_note-10"><a href="#cite_ref-10">^</a> Bethke, C.M., ChemPlugin User's Guide Release 15. Aqueous Solutions LLC, Champaign, IL USA <a rel="nofollow" class="external free" href="https://www.chemplugin.gwb.com/documentation.php">https://www.chemplugin.gwb.com/documentation.php</a>

</li>

<li id="cite_note-11"><a href="#cite_ref-11">^</a> <cite id="CITEREFDethlefsenHaaseEbertDahmke2011" class="citation journal cs1">Dethlefsen, Frank; Haase, Christoph; Ebert, Markus; Dahmke, Andreas (2011-01-01). <a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.egypro.2011.02.311">"Effects of the variances of input parameters on water-mineral interactions during CO2 sequestration modeling"</a>. Energy Procedia. 10th International Conference on Greenhouse Gas Control Technologies. 4: 3770–3777. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.egypro.2011.02.311">10.1016/j.egypro.2011.02.311</a>.</cite>

</li>

<li id="cite_note-12"><a href="#cite_ref-12">^</a> <cite id="CITEREFHaaseDethlefsenEbertDahmke2013" class="citation journal cs1">Haase, Christoph; Dethlefsen, Frank; Ebert, Markus; Dahmke, Andreas (2013-06-01). "Uncertainty in geochemical modelling of CO2 and calcite dissolution in NaCl solutions due to different modelling codes and thermodynamic databases". Applied Geochemistry. 33: 306–317. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2013ApGC...33..306H">2013ApGC...33..306H</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.apgeochem.2013.03.001">10.1016/j.apgeochem.2013.03.001</a>.</cite>

</li>

<li id="cite_note-:0-13">^ <a href="#cite_ref-:0_13-0">a</a> <a href="#cite_ref-:0_13-1">b</a> <cite id="CITEREFHaaseEbertDethlefsen2016" class="citation journal cs1">Haase, Christoph; Ebert, Markus; Dethlefsen, Frank (2016-04-01). "Uncertainties of geochemical codes and thermodynamic databases for predicting the impact of carbon dioxide on geologic formations". Applied Geochemistry. 67: 81–92. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2016ApGC...67...81H">2016ApGC...67...81H</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.apgeochem.2016.01.008">10.1016/j.apgeochem.2016.01.008</a>.</cite>

</li>

<li id="cite_note-14"><a href="#cite_ref-14">^</a> Muller, B., 2004, CHEMEQL V3.0, A program to calculate chemical speciation equilibria, titrations, dissolution, precipitation, adsorption, kinetics, pX-pY diagrams, solubility diagrams. Limnological Research Center EAWAG/ETH, Kastanienbaum, Switzerland

</li>

<li id="cite_note-15"><a href="#cite_ref-15">^</a> van der Lee, J., and L. De Windt, 2000, CHESS, another speciation and complexation computer code. Technical Report no. LHM/RD/93/39, Ecole des Mines de Paris, Fontainebleau

</li>

<li id="cite_note-16"><a href="#cite_ref-16">^</a> Reed, M.H., 1982, Calculation of multicomponent chemical equilibria and reaction processes in systems involving minerals, gases, and aqueous phase. Geochimica et Cosmochemica Acta 46, 513-528.

</li>

<li id="cite_note-17"><a href="#cite_ref-17">^</a> Steefel, C.I. and A.C. Lasaga, 1994, A coupled model for transport of multiple chemical species and kinetic precipitation/dissolution reactions with application to reactive flow in single phase hydrothermal systems. American Journal of Science 294, 529-592

</li>

<li id="cite_note-18"><a href="#cite_ref-18">^</a> Steefel, C.I., 2001, GIMRT, Version 1.2: Software for modeling multicomponent, multidimensional reactive transport, User's Guide. Report UCRL-MA-143182, Lawrence Livermore National Laboratory, Livermore, California.

</li>

<li id="cite_note-19"><a href="#cite_ref-19">^</a> Wolery, T.J., 1992a, EQ3/EQ6, a software package for geochemical modeling of aqueous systems, package overview and installation guide (version 7.0). Lawrence Livermore National Laboratory Report UCRL-MA-110662(1).

</li>

<li id="cite_note-20"><a href="#cite_ref-20">^</a> Kulik, D.A., 2002, Gibbs energy minimization approach to model sorption equilibria at the mineral-water interface: Thermodynamic relations for multi-site surface complexation. American Journal of Science 302, 227-279

</li>

<li id="cite_note-21"><a href="#cite_ref-21">^</a> Shaff, J.E., B.A. Schultz, E.J. Craft, R.T. Clark, and L.V. Kochian, 2010, GEOCHEM-EZ: a chemical speciation program with greater power and flexibility. Plant Soil 330(1), 207-214

</li>

<li id="cite_note-22"><a href="#cite_ref-22">^</a> Bethke, C.M., B. Farrell, and M. Sharifi, 2021, The Geochemist's Workbench Release 15 (five volumes). Aqueous Solutions LLC, Champaign, IL USA

</li>

<li id="cite_note-23"><a href="#cite_ref-23">^</a> Cheng, H.P. and G.T. Yeh, 1998, Development of a three-dimensional model of subsurface flow, heat transfer, and reactive chemical transport: 3DHYDROGEOCHEM. Journal of Contaminant Hydrology 34, 47-83

</li>

<li id="cite_note-24"><a href="#cite_ref-24">^</a> Westall, J.C., J.L. Zachary and F.F.M. Morel, 1976, MINEQL, a computer program for the calculation of chemical equilibrium composition of aqueous systems. Technical Note 18, R.M. Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA.

</li>

<li id="cite_note-25"><a href="#cite_ref-25">^</a> Scherer, W.D. and D.C. McAvoy, 1994, MINEQL+, A Chemical Equilibrium Program for Personal Computers, User's Manual, version 3.0. Environmental Research Software, Inc., Hallowell, ME.

</li>

<li id="cite_note-26"><a href="#cite_ref-26">^</a> Allison, J.D., D.S. Brown and K.J. Novo-Gradac, 1991, MINTEQA2/ PRODEFA2, a geochemical assessment model for environmental systems, version 3.0 user's manual. US Environmental Protectiona Agency Report EPA/600/3-91/021.

</li>

<li id="cite_note-27"><a href="#cite_ref-27">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://orchestra.meeussen.nl/">"ORCHESTRA | Geochemical and Transport Modelling"</a>. Retrieved 2022-09-29.</cite>

</li>

<li id="cite_note-28"><a href="#cite_ref-28">^</a> Parkhurst, D.L., 1995, User's Guide to PHREEQC, a computer model for speciation, reaction-path, advective-transport and inverse geochemical calculations. US Geological Survey Water-Resources Investigations Report 95-4227.

</li>

<li id="cite_note-29"><a href="#cite_ref-29">^</a> Parkhurst, D.L. and C.A.J. Appelo, 1999, User's Guide to PHREEQC (version 2), a computer program for speciation, batch-reaction, one-dimensional transport and inverse geochemical calculations. US Geological Survey Water-Resources Investigations Report 99-4259.

</li>

<li id="cite_note-30"><a href="#cite_ref-30">^</a> Leal, A.M.M., Kulik, D.A., Smith, W.R. and Saar, M.O., 2017, An overview of computational methods for chemical equilibrium and kinetic calculations for geochemical and reactive transport modeling. Pure and Applied Chemistry. 89 (5), 145–166.

</li>

<li id="cite_note-31"><a href="#cite_ref-31">^</a> Perkins, E.H., 1992, Integration of intensive variable diagrams and fluid phase equilibria with SOLMINEQ.88 pc/shell. In Y.K. Kharaka and A.S. Maest (eds.), Water-Rock Interaction, Balkema, Rotterdam, p. 1079-1081.

</li>

<li id="cite_note-32"><a href="#cite_ref-32">^</a> Xu, T., E.L. Sonnenthal, N. Spycher and K. Pruess, 2004, TOUGHREACT user's guide: A simulation program for non-isothermal multiphase reactive geochemical transport in variably saturated geologic media. Report LBNL-55460, Lawrence Berkeley National Laboratory, Berkeley, California.

</li>

<li id="cite_note-33"><a href="#cite_ref-33">^</a> hem.bredband.net/b108693/-VisualMINTEQ_references.pdf

</li>

<li id="cite_note-34"><a href="#cite_ref-34">^</a> Ball, J.W. and D.K. Nordstrom, 1991, User's manual for WATEQ4F, with revised thermodynamic data base and test cases for calculating speciation of major, trace, and redox elements in natural waters. US Geological Survey Open File Report 91-183.

</li>

<li id="cite_note-35"><a href="#cite_ref-35">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://worm-portal.asu.edu/docs/gettingstarted/">"Getting Started - WORM Portal"</a>. worm-portal.asu.edu. Retrieved 2025-05-09.</cite>

</li>

<li id="cite_note-36"><a href="#cite_ref-36">^</a> Tipping E., 1994, WHAM - a chemical equilibrium model and computer code for waters, sediments and soils incorporating a discrete site/electrostatic model of ion-binding by humic substances. Computers and Geosciences 20, 973-1023.

</li>

<li id="cite_note-37"><a href="#cite_ref-37">^</a> <cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://water.usgs.gov/software/lists/geochemical">"Water Resources Geochemical Software"</a>. water.usgs.gov. Retrieved 2020-09-25.</cite>

</li>

</ol></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-15" href="https://en.wikipedia.org/wiki/?title=Geochemical_modeling&oldid=1300591983">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

</div>

</div></div>

</div>

</main>

</div>

</body></html>