Abstract
Distribution coefficients for sorption and desorption of atrazine were determined for all combinations of three chemical treatments and four particle size fractions prepared from a typical soil clay. Organic and inorganic components were 11 and 89% of the mass and contributed 63 and 32% of the affinity of the soil clay for atrazine, respectively. Organic matter associated with the coarse clay had substantially greater affinity for atrazine and exhibited greater sorption-desorption hysteresis than organic matter associated with the fine clay. Silicate minerals had a moderate affinity for atrazine and exhibited little sorption-desorption hysteresis. Free Fe compounds interacted with silicate minerals in the coarse and medium clay to reduce affinity of the silicate minerals for atrazine (.)
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