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Environmental fate & pathways

Adsorption / desorption

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GLS in particulate form is immobile in soil and sediment.  GLS is rich in calcium and carbonate, unburned coal and sodium. Calcium carbonate (“calcite” in pure crystalline form) is poorly soluble in water but reacts with strong acids, releasing carbon dioxide. Calcium carbonate reacts with water saturated with carbon dioxide and forms soluble calcium hydrogen carbonate (Ca(HCO3)2 “bicarbonate”.  CaCO3(s) + CO2+ H2O <-> Ca(HCO3)2 
Adsorption/desorption behavior of dissolved constituents is governed mainly by inorganic soil and sediment materials. Each constituent behave by a characteristic way depending highly on local environmental conditions. Generally the adsorption of the ionic constituents to organic materials is weak and adsorption to minerals is stronger and more pronounced. Adsorption/desorption of calcium and sodium and consequently their mobility and bioavailability is much related to the soil cation exchange capacity (CEC).

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