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Adsorption of Diuron and 2,4,5-T on Soil Particle-Size Separates¹

ABSTRACT

Equilibrium isotherms for the adsorption of herbicides, diuron, and 2,4,5-T on whole soil and various-size separates of Webster soil (Typic Haplaquolls) were measured. The Freundlich adsorption coefficient, K, for diuron varied by a factor of about 7 among the different particle-size fractions. However, the sorption coefficient, K, normalized with respect to soil organic carbon (OC) content, denoted as K_oc = (K/OC), varied only within a factor of 1.5. For 2,4,5-T herbicide, the K_oc values for the silt and clay-size fractions, as well as the whole soil, were essentially identical and about 3 times larger than that for the sand-size fraction. The results suggested that the soil particle-size separates may be grouped into two size classes: "fine" ( 50 µm) and "coarse" (2,000-50 µm). For a given pesticide, a specific K_oc value may be assigned to each class.

Key Words: pesticides • toxic organic chemicals (TOS) • herbicides • sorption • runoff losses • nonpoint source pollution

¹ Contribution from the Institute of Food & Agricultural Sciences, University of Florida. Approved for publication as Florida Agric. Exp. Stn. Journal Series no. 4502. This research was funded in part by USEPA Grant no. R-805529.

² Research Associate, Associate Professor, and former Laboratory Technologist, respectively, Soil Science Dep., University of Florida, Gainesville, FL 32611.

Received for publication March 22, 1982.

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