{"id":1553,"date":"2026-02-25T20:32:28","date_gmt":"2026-02-25T20:32:28","guid":{"rendered":"https:\/\/gaeatech.com\/wordpress\/?p=1553"},"modified":"2026-03-26T04:32:30","modified_gmt":"2026-03-26T04:32:30","slug":"how-to-model-sorption-pollutev8","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/how-to-model-sorption-pollutev8\/","title":{"rendered":"How Do I Model Adsorption and Sorption in POLLUTEv8?"},"content":{"rendered":"\n<p>Understanding how contaminants interact with soil particles is critical for accurate environmental modeling. In&nbsp;<strong><a href=\"https:\/\/www.gaeatech.com\/pollute.php\">POLLUTEv8<\/a><\/strong>, developed by&nbsp;GAEA Technologies, sorption is one of the most influential parameters affecting the transport and retardation of pollutants through a liner or soil layer.<\/p>\n\n\n\n<p>If you are looking to refine your transport models, here is a step-by-step guide on how to implement sorption effectively.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"h-understanding-the-mechanism-the-retardation-factor\" class=\"wp-block-heading\">Understanding the Mechanism: The Retardation Factor<\/h3>\n\n\n\n<p>In POLLUTEv8, sorption is typically accounted for using the&nbsp;Retardation Factor (R<strong>)<\/strong>. This factor represents how much slower a contaminant moves compared to the actual velocity of the groundwater due to its adherence to soil particles.<\/p>\n\n\n\n<p>The relationship is defined by the following linear isotherm equation:<\/p>\n\n\n\n<div class=\"wp-block-math\"><math display=\"block\"><semantics><mrow><mi>R<\/mi><mo>=<\/mo><mn>1<\/mn><mo>+<\/mo><mfrac><mrow><msub><mi>\u03c1<\/mi><mi>d<\/mi><\/msub><mo>\u22c5<\/mo><msub><mi>K<\/mi><mi>d<\/mi><\/msub><\/mrow><mi>n<\/mi><\/mfrac><\/mrow><annotation encoding=\"application\/x-tex\">\nR = 1 + \\frac{\\rho_d \\cdot K_d}{n}\n<\/annotation><\/semantics><\/math><\/div>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><math data-latex=\"\\rho_d\"><semantics><msub><mi>\u03c1<\/mi><mi>d<\/mi><\/msub><annotation encoding=\"application\/x-tex\">\\rho_d<\/annotation><\/semantics><\/math>\u00a0= Dry density of the soil<\/li>\n\n\n\n<li>K<sub>d<\/sub><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>\u00a0= Distribution coefficient<\/li>\n\n\n\n<li>n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>\u00a0= Porosity of the medium<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"h-choosing-your-sorption-model\" class=\"wp-block-heading\">Choosing Your Sorption Model<\/h3>\n\n\n\n<p>Sorption is defined on a layer-by-layer basis, allowing you to model complex stratigraphy (e.g., a clay liner over a sandy aquifer). POLLUTEv8 allows for different types of sorption inputs depending on the complexity of your data:<\/p>\n\n\n\n<h4 id=\"h-linear-sorption-k-d\" class=\"wp-block-heading\"><strong>Linear Sorption (K<sub>d<\/sub>)<\/strong><\/h4>\n\n\n\n<p>The most common method. You enter a constant distribution coefficient. Linear sorption is entered in the Layer Properties tab of the model as the Distribution Coefficient.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"224\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-105.png\" alt=\"\" class=\"wp-image-1564\" srcset=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-105.png 900w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-105-300x75.png 300w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-105-768x191.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 id=\"h-freundlich-and-langmuir-non-linear-sorption\" class=\"wp-block-heading\"><strong>Freundlich and Langmuir <\/strong>Non-linear Sorption<\/h4>\n\n\n\n<p>Used for non-linear sorption where the capacity of the soil to &#8220;grab&#8221; the contaminant changes based on concentration. Non-linear sorption is entered on the Special Features tab. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"898\" height=\"385\" src=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-106.png\" alt=\"\" class=\"wp-image-1565\" srcset=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-106.png 898w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-106-300x129.png 300w, https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/02\/image-106-768x329.png 768w\" sizes=\"auto, (max-width: 898px) 100vw, 898px\" \/><\/figure>\n\n\n\n<p>In contaminant transport modeling with&nbsp;<strong>POLLUTEv8<\/strong>, choosing between Langmuir and Freundlich models depends on the surface properties of your soil and how you expect the contaminant to behave at high concentrations.<\/p>\n\n\n\n<p><strong>Key Differences Between Models<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Feature&nbsp;<\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Langmuir Isotherm<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Freundlich Isotherm<\/strong><\/th><\/tr><tr><td><strong>Surface Assumption<\/strong><\/td><td>Homogeneous (all sites are identical).<\/td><td>Heterogeneous (sites have varying energies).<\/td><\/tr><tr><td><strong>Layering<\/strong><\/td><td>Monolayer&nbsp;only; once a site is occupied, no more can be added.<\/td><td>Multilayer&nbsp;adsorption; stacking of molecules is possible.<\/td><\/tr><tr><td><strong>Saturation<\/strong><\/td><td>Reaches a distinct&nbsp;plateau&nbsp;(maximum capacity&nbsp;<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/3102db3a-3774-4ca1-8aba-79efa9033b48\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>).<\/td><td>No theoretical saturation; capacity increases with concentration.<\/td><\/tr><tr><td><strong>Nature<\/strong><\/td><td>Theoretical\/Mechanistic.<\/td><td>Empirical (based on observation).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>When to Use Each in POLLUTEv8<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Choose Langmuir<\/strong>&nbsp;if you are modeling&nbsp;<strong>specif<\/strong>i<strong>c chemical binding<\/strong>&nbsp;(chemisorption) or ion exchange, such as heavy metals on clay. It is ideal when you need to define a hard limit on how much a soil layer can hold (the &#8220;maximum adsorption capacity&#8221;).<\/li>\n\n\n\n<li><strong>Choose Freundlich<\/strong>&nbsp;if you are modeling&nbsp;organic contaminants&nbsp;or complex, natural soils with many different types of particles. It is often a better fit for a wide range of concentrations because it accounts for &#8220;stronger&#8221; sites being filled first.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p><strong>Pro-Tip:<\/strong>&nbsp;In the software, non-linear models are often more accurate than linear ones at very high or very low concentrations where the &#8220;constant&nbsp;K<sub>d<\/sub><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>&#8221; assumption fails.&nbsp;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"h-pro-tips-for-accurate-modeling\" class=\"wp-block-heading\">Pro-Tips for Accurate Modeling<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conservative vs. Non-Conservative:<\/strong>&nbsp;If you are unsure of the sorption capacity, model the contaminant as &#8220;conservative&#8221; (setting&nbsp;<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/d1130a79-2a53-45e4-80a2-57a9a407c093\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>) first to see the worst-case scenario.<\/li>\n\n\n\n<li><strong>Sensitivity Analysis:<\/strong>&nbsp;Always run a sensitivity analysis on your&nbsp;<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/74f927c9-81dc-45a3-9d66-049582289783\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>&nbsp;values. Small changes in sorption can lead to massive differences in predicted &#8220;breakthrough times.&#8221;<\/li>\n\n\n\n<li><strong>Refer to the Manual:<\/strong>&nbsp;For specific software navigation, consult the&nbsp;GAEA Technologies <a href=\"https:\/\/www.gaeatech.com\/public\/POLLUTE_MIGRATE_User_Guide.pdf\">POLLUTEv8 Documentation<\/a>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"h-reference-table-typical-k-d-values-and-sorption-potential\" class=\"wp-block-heading\">Reference Table: Typical K<sub>d<\/sub> Values and Sorption Potential<\/h3>\n\n\n\n<p>The following values are generalized. In&nbsp;POLLUTEv8, these should be adjusted based on site-specific soil tests.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Contaminant<\/th><th class=\"has-text-align-left\" data-align=\"left\">Typical&nbsp;<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/a016ea47-c6ea-4f03-8d03-f85b3bd7e0f6\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>&nbsp;K<sub>d<\/sub> Range (mL\/g<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/cda29a83-b39b-457e-b52e-a3e85b8330e8\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Sorption Potential<\/th><th class=\"has-text-align-left\" data-align=\"left\">Retardation Behavior<\/th><\/tr><tr><td><strong>Chloride<\/strong><\/td><td>0<\/td><td>None (Conservative)<\/td><td>Moves at the same speed as water.<\/td><\/tr><tr><td><strong>Benzene<\/strong><\/td><td>0.5 \u2013 2.0<\/td><td>Low to Moderate<\/td><td>Slight delay; highly mobile in low-carbon soils.<\/td><\/tr><tr><td><strong>Toluene<\/strong><\/td><td>1.0 \u2013 5.0<\/td><td>Moderate<\/td><td>Noticeable lag in breakthrough time.<\/td><\/tr><tr><td><strong>Cadmium<\/strong><\/td><td>1.5 \u2013 25.0<\/td><td>High<\/td><td>Strongly pH-dependent; often highly retarded.<\/td><\/tr><tr><td><strong>Lead<\/strong><\/td><td>10.0 \u2013 100+<\/td><td>Very High<\/td><td>Highly immobile; moves very slowly through clay.<\/td><\/tr><tr><td><strong>PFAS (PFOA)<\/strong><\/td><td>0.2 \u2013 5.0<\/td><td>Variable<\/td><td>Depends heavily on organic carbon content.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 id=\"h-summary\" class=\"wp-block-heading\">Summary<\/h3>\n\n\n\n<p>Modeling sorption in POLLUTEv8 involves defining the&nbsp;Retardation Factor&nbsp;within the layer properties. By inputting the soil&#8217;s dry density, porosity, and the contaminant&#8217;s distribution coefficient (K<sub>d<\/sub><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>), the software calculates how much the pollutant&#8217;s migration is delayed. This is essential for determining the long-term effectiveness of landfill liners and remediation barriers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding how contaminants interact with soil particles is critical for accurate environmental modeling. In&nbsp;POLLUTEv8, developed by&nbsp;GAEA Technologies, sorption is one of the most influential parameters affecting the transport and retardation of pollutants through a liner or soil layer. If you are looking to refine your transport models, here is a step-by-step guide on how to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":91257,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1204,726],"tags":[666,501,192,663,665,549,664,662],"class_list":["post-1553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contaminant-transport-modeling-tutorials","category-training-and-tutorials","tag-adsorption","tag-contaminant-transport","tag-gaea-technologies","tag-hydrogeology-software","tag-kd-value","tag-pollutev8","tag-retardation-factor","tag-sorption-modeling"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Model Sorption in POLLUTEv8 for Environmental Accuracy - 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