Effects of bituminous emulsions on retention and release of some chemical elements in two soil samples |
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| Authors: | N Salem M Verloo M De Boodt |
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| Institution: | State University of Ghent, Faculty of Agriculture, Coupure Links 653—9000 Ghent Belgium |
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| Abstract: | The effects of bituminous emulsions on the retention and release of some nutrient elements and heavy metals were investigated in the laboratory for a pair of different soil samples, one from each of Egypt and Belgium. The emulsion was applied at several rates to promote the formation of aggregates, to stabilize them, and to make the soil samples more hydrophobic. The quantities of extractable potassium and trace elements were determined for the untreated and treated samples, as well as for aggregates more than 2 mm in diameter before and after destruction.The results show that addition of bituminous emulsion increases aggregation percentage and aggregate stability, and decreases the extractable amounts of elements. This effect increases with increasing concentration of bituminous emulsion. The extractable amounts of the nutrient elements after destruction of the aggregates were higher than those before destruction. The mechanisms of retention and release of nutrient elements before and after destroying the aggregates are schematically presented and discussed. |
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