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- Title
Phosphorus Sorption and Desorption in Soils Treated by Thermal Desorption.
- Authors
Croat, S. J.; DeSutter, T. M.; Casey, F. X. M.; O'Brien, P. L.
- Abstract
Thermal desorption (TD) is an effective way to remove hydrocarbons from soil. Soil exposure to temperatures between 100 and 400 °C to volatilize hydrocarbons can alter soil chemical properties that have potential to change phosphorus (P) dynamics. A series of laboratory soil sorption and desorption experiments were conducted on native and thermal desorption (TD)-treated soils to determine behavior of P with respect to availability for plant uptake and risk for runoff. The average relative increase in P sorption after TD treatment was between 14 and 26% as shown by Smax values. This increase in soil P sorption capacity is likely due to the potential creation of biochar materials and mineral transformations of Fe and Al oxides during TD treatment. Dissolved organic carbon association with P did not influence sorption. Desorption of P was least in TD-treated soils, indicating that the interaction between P and binding sites was strong. The amount of P retained by these soils (Smax values) may be of agronomic concern and should be considered when developing fertility plans. Based on these results, TD-treated soils pose no apparent threat to nearby surface waters.
- Subjects
THERMAL desorption; SOIL absorption &; adsorption; DISSOLVED organic matter; CHEMICAL properties; PHOSPHORUS
- Publication
Water, Air & Soil Pollution, 2020, Vol 231, Issue 5, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-020-04579-x