8.Adsorp.Desorp.17.ppt

8.Adsorp.Desorp.17.ppt - Chemical Adsorption and Desorption...

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Chemical Adsorption and Desorption Introduction Components of Soils and Sediments Surface Sorption of Ions Surface Sorption of Neutral Organics The Sorption Process The Role of Organic Carbon Summary and Conclusions
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I. Introduction Why do some hydrocarbons leach with water percolation while others are retained in the upper soil layer? BTEX Low water solubility (<1 ppm) MTBE High water solubility (~43000 ppm)
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II. Components of Soils and Sediments Minerals (no carbon) – iron-oxides, silicates and aluminates Organic matter (carbon) – carbon-based matter (“humus”) 1. 2.
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A Typical Soil Mineral fraction in imperfect spherical shapes Mineral particulates surrounded by water and an “organic” phase
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Fundamental Definitions Adsorption (or sorption): attachment of a solute to a solid surface – once sorbed, it becomes a sorbate Desorption: release of a sorbate from a solid surface – once desorbed, it becomes a solute. An equilibrium process Ad sorption and ab sorption are not the same. How do they differ? Ionic solutes undergo electrostatic attraction – clays and humus have finite number of negatively charged sites
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