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Research Project:
Mechanisms and Forces Controlling Pesticide Retention by Soil Clay Minerals
Location:
Soil and Water Quality Research
Project Number: 3625-11120-002-03
Project Type:
Reimbursable
Start Date: Oct 02, 2002
End Date: Nov 30, 2004
Objective:
Evaluate the effects of exchangeable cation composition on the retention of pesticides by clay minerals, aquifers, and surface soils; directly determine the interlayer environments that are conducive to adsorption of pesticides by swelling clay minerals; and, to further define the range of pesticides that adsorb strongly to clay minerals and to determine the key driving forces well enough to begin predicting the strength of pesticide-clay interactions.
Approach:
The objectives will be addressed through an integrated series of laboratory-based cation-exchange and pesticide (4,6-dinitro-ortho-cresol) adsorption experiments involving reference and soil clays. X-ray diffraction analysis of clays in aqueous suspensions with the presence and absence of the pesticide will be used to determine the effect of the pesticide on the clays. Clays with various Ca/K ratios will be prepared using cation exchange techniques. These prepared K/Ca-clays will be used for adsorption experiments involving the pesticide and the same samples will be analyzed by X-ray diffraction to determine interactions between clay cation composition, clay swelling, and pesticide adsorption affinity.
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