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Soxhlet Extraction of Simazine from Soils
Author(s) -
Adams Russell S.
Publication year - 1966
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1966.03615995003000060013x
Subject(s) - simazine , chemistry , soil water , extraction (chemistry) , organic matter , extractor , environmental chemistry , solvent , chromatography , soil science , geology , organic chemistry , atrazine , agronomy , pesticide , engineering , process engineering , biology
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.