In the study of the environmental fate of pesticides their soil adsorption constants are used to characterize their distribution in different environmental compartments. These values are generally estimated for the pure active ingredient (a.i.). However, formulated products are the ones used in the field. The pesticide formulation has other components besides the a.i. which can alter the a.i. water solubility and soil retention potential. In order to obtain data on pesticide behaviour under field conditions the difference between the soil adsorption of chlorpyrifos and carbofuran was evaluated using commercially available formulations and the pure active ingredients. Typical soils of various countries of Central and South America as well as Austria were used and the constants were determined using an harmonized protocol. Adsorption constants (Kd) and the adsorption constants normalized to organic carbon content (Koc) in soil were estimated. Parameters of the Freundlich isotherms where determined according to the OECD batch equilibrium method using radiolabeled 14C-chlorpyrifos and 14C-carbofuran.

Comparison of estimated Kd and Koc for pesticides using pure active ingredient and formulated product in soils from Latin America and Europe using radiometric techniques

248th National Meeting (2014)

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