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Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School



Pesticide researchers have long been aware that the type of soil to which a pesticide is applied will affect its performance and its environmental persistence. Consequentially, many studies have been done to compare pesticide behavior in various soils. Soil components such as clay mineral fraction, humic acid and fulvic acid fractions have been separated from soil in an effort to determine their individual contribution to these factions. Little attention has been given to the effect of the lipid fraction on pesticide behavior in soils. Soil lipids are defined as organic molecules insoluble in water but extractable by non-polar organic solvents, such as chloroform, hexane, ether, and benzene. Lipids occur in two states in soils. Free lipids are those easily extracted by organic solvents. Bound lipids are not easily extracted and are believed to be bonded to clay surfaces or so intimately associated with the humic material that those structures must be altered or partially broken down to release the lipids. In mineral soils the lipid fraction can compose 1 to 5% of the total organic matter and in organic soils, lipid content can range from 10 to20% of total organic matter (Braids and Miller, 1985). Soil lipids normally account for 4 to 8% of the total soil organic carbon. The free lipid fraction will be the fraction under investigation in this thesis. I will begin with a review of soil constituents and types of adsorption. Then the sorption behavior of atrazine on these soil components as it is understood today will be discussed.

Library of Congress Subject Headings

Soil absorption and adsorption

Soils -- Organic compounds content





Number of Pages



South Dakota State University