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Soxhlet Extraction of Simazine from Soils¹

ABSTRACT

Simazine was quantitatively extracted from soils and clays in 2 to 24 hours using 95% ethanol as a solvent in a Soxhlet extractor. Absorption of ultraviolet light by the extracts was measured at 220 and 240 m µ and quantities of simazine and hydroxysimazine calculated from simultaneous equations. Plotting recovery of simazine vs. time of extraction as a first-order reaction gave straight lines that varied in slope with each soil or clay sample. From the slope of the line a release constant (K_RC) was calculated. Relating these constants to clay and organic matter contents and the cation-exchange capacity (CEC) of the soils indicated that the ease of extraction was inversely related to the clay contents and CEC. However, bioassays demonstrated that the organic matter contents of the soils exerted the greatest influence upon the bioactivity of simazine in these soils. The organic matter-simazine complex was presumed to be soluble in the alcohol and the K_RC values were considered to represent a measure of the affinity of the clay for simazine.

¹ Contribution from the Soil Science Department, University of Minnesota, Paper no. 5853 Scientific Journal Series, Minnesota Agr. Exp. Sta. Presented at a meeting of Div. S-2, Soil Science Society of America, Kansas City, Missouri, Nov. 15–19, 1964.

² Assistant Professor of Soil Science, University of Minnesota.

Received for publication January 10, 1966. Accepted for publication August 18, 1966.