{"id":1553,"date":"2026-02-25T20:32:28","date_gmt":"2026-02-25T20:32:28","guid":{"rendered":"https:\/\/gaeatech.com\/wordpress\/?p=1553"},"modified":"2026-04-27T00:32:50","modified_gmt":"2026-04-27T00:32:50","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 POLLUTEv10?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Understanding how contaminants interact with soil particles is critical for accurate environmental modeling. In\u00a0<strong><a href=\"https:\/\/www.gaeatech.com\/pollute.php\">POLLUTEv10<\/a><\/strong>, developed by\u00a0GAEA 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 class=\"wp-block-paragraph\">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 class=\"wp-block-heading\" id=\"h-understanding-the-mechanism-the-retardation-factor\">Understanding the Mechanism: The Retardation Factor<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In POLLUTEv10, sorption is typically accounted for using the\u00a0Retardation 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 class=\"wp-block-paragraph\">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 class=\"wp-block-paragraph\">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>&nbsp;= 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>&nbsp;= Distribution coefficient<\/li>\n\n\n\n<li>n<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>&nbsp;= 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 class=\"wp-block-heading\" id=\"h-choosing-your-sorption-model\">Choosing Your Sorption Model<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sorption is defined on a layer-by-layer basis, allowing you to model complex stratigraphy (e.g., a clay liner over a sandy aquifer). POLLUTEv10 allows for different types of sorption inputs depending on the complexity of your data:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-linear-sorption-k-d\"><strong>Linear Sorption (K<sub>d<\/sub>)<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">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 class=\"wp-block-heading\" id=\"h-freundlich-and-langmuir-non-linear-sorption\"><strong>Freundlich and Langmuir <\/strong>Non-linear Sorption<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">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 class=\"wp-block-paragraph\">In contaminant transport modeling with\u00a0<strong>POLLUTEv10<\/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 class=\"wp-block-paragraph\"><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 class=\"wp-block-paragraph\"><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 class=\"wp-block-paragraph\"><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 class=\"wp-block-heading\" id=\"h-pro-tips-for-accurate-modeling\">Pro-Tips for Accurate Modeling<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conservative vs. Non-Conservative:<\/strong>\u00a0If you are unsure of the sorption capacity, model the contaminant as &#8220;conservative&#8221;  first to see the worst-case scenario.<\/li>\n\n\n\n<li><strong>Sensitivity Analysis:<\/strong>\u00a0Always run a sensitivity analysis on your<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>\u00a0values. 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>\u00a0For specific software navigation, consult the\u00a0GAEA Technologies <a href=\"https:\/\/www.gaeatech.com\/public\/POLLUTE_MIGRATE_User_Guide.pdf\">POLLUTEv10 Documentation<\/a>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-reference-table-typical-k-d-values-and-sorption-potential\">Reference Table: Typical K<sub>d<\/sub> Values and Sorption Potential<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The following values are generalized. In\u00a0POLLUTEv10, 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 class=\"wp-block-heading\" id=\"h-summary\">Summary<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modeling sorption in POLLUTEv10 involves defining the\u00a0Retardation Factor\u00a0within 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 class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding how contaminants interact with soil particles is critical for accurate environmental modeling. In\u00a0POLLUTEv10, developed by\u00a0GAEA 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 v27.6.1 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Model Sorption in POLLUTEv8 for Environmental Accuracy - 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