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Adsorption and desorption characteristics of endosulfan pesticide from three soils in
In this thesis adsorption and desorption features were studied in details in three samples from the soil of Palestine. Soil samples were red soil, chalk soil, and sandy soil according to American Society for Testing and Materials (ASTM) scale for the classification of the soil. Adsorption and desorption rates on soil samples were calculated from kinetic studies. The values varied based on the type of soil.
Maximum specific adsorption capacities (qmax) for soil samples using Langmuir model, were as follows: 0,387 (red soil), and 0,281
(chalk soil), and (0.075) sandy soil mg / g of endosulfan.
Maximum adsorption was measured in red soil followed by chalk soil, but it was the least for the sandy soil. Also, the proportion of organic matter play a major role in both processes adsorption and desorptio on soil samples.
_SetupBidi('source'); here was a significant reduction in the process of Adsorption in soil samples compared with the decline in pH. Desorption was higher at both acidic and alkaline pH ranges compared to neutral pH. Both the increase in temperature and concentration increase the adsorption and desorption in all soil samples.
Finally, the results showed that the mobility of endosulfan, is more possible in the sandy soil followed by red, followed by chalk soil This may be attributed to the crystal lattice of red soil that play an important role in both processes adsorption and desorption, as it could be a major role for chemical and biological processes that play a role in the other soil samples.
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|adsorption , characteristics , desorption , endosulfan , pesticide , soils|