The Adsorption of Herbicides and Pesticides on Clay Minerals and Soils. Part 2. Atrazine |
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Authors: | J Eric D Davies Nusrat Jabeen |
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Institution: | (1) Department of Environmental Science, Institute of Environmental and Natural Sciences, Lancaster University, Lancaster, Lancs., LA1 4YQ, Great Britain |
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Abstract: | The adsorption of atrazine and two model compounds,2-chloropyrimidine and 3-chloropyridine on clay minerals(bentonite, montmorillonite and kaolinite), organic matter (humic acid) and soil (with and without organic matter) has beenstudied using FT-infrared spectroscopy (IR), thermogravimetric analysis (TGA), high pressureliquid chromatography (HPLC) and X-ray diffraction (XRD).3-Chloropyridine, 2-chloropyrimidine and atrazine were adsorbedthrough hydrogen bonding on bentonite, montmorillonite, humic acid and soil. In addition tohydrogen bonding, protonation of 3-chloropyridine and atrazine was also observed.In the adsorption of 2-chloropyrimidine on bentonite and montmorillonitean ion exchange mechanism also occurred. No adsorption of 3-chloropyridine or 2-chloropyrimidine wasobserved on the kaolinite clay mineral.Both the clay minerals and organic matter of soil contribute tothe adsorption of organic compounds on soil but the clay minerals bentonite and montmorilloniteplay a major role in their adsorption on soil. |
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Keywords: | adsorption bentonite clay minerals herbicides intercalation IR spectroscopy atrazine kaolinite montmorillonite TGA XRD |
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