1. Adsorption and thermodynamic parameters of chlorantraniliprole and dinotefuran on clay loam soil with difference in particle size and pH
- Author
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Mohamed E. I. Badawy, Maher I. Aly, Mohamed R. Fouad, and Ahmed F. El-Aswad
- Subjects
Insecticides ,Bulk soil ,02 engineering and technology ,010501 environmental sciences ,Silt ,Guanidines ,complex mixtures ,01 natural sciences ,Endothermic process ,Neonicotinoids ,Soil ,Adsorption ,0203 mechanical engineering ,Soil Pollutants ,Humic acid ,ortho-Aminobenzoates ,Particle Size ,Humic Substances ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,Chemistry ,Temperature ,020302 automobile design & engineering ,Sorption ,General Medicine ,Hydrogen-Ion Concentration ,Nitro Compounds ,Pollution ,Environmental chemistry ,Loam ,Clay ,Thermodynamics ,Egypt ,Particle size ,Food Science - Abstract
The behavior of chlorantraniliprole (CAP) and dinotefuran (DNF) insecticides was investigated in clay loam soil, a common type of the Egyptian soil. Effect of temperature, pH and particle size of the soil on the adsorption process was studied. Adsorption isotherm by bulk soil and its constituents; humic acid (HA), clay, silt and sand fractions was measured using batch equilibration technique. The results showed that the adsorption of the insecticides tested was significantly affected by the temperature and was a spontaneous interfacial process in the soil. Freundlich model accurately predicted the adsorption behavior of both insecticides. The interaction between soil and insecticides was endothermic and the highest adsorption for CAP and DNF was obtained at pH 9. However, the effect of pH on the adsorption of DNF was lower than that of CAP. Sorption of CAP and DNF on HA fraction was significantly greater than on clay fraction and bulk soil. In addition, the adsorption was significantly increased with particle size decrease. It could be inferred that the adsorption of CAP and DNF on clay loam soil was physical in nature and greatly influenced by the soil components, pH and temperature.
- Published
- 2019
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