Volatilisation represents a major dissipation pathway of pesticides from the crop as well as a contamination to the environment. However, data regarding the effect of formulation additives on the volatility of pesticides is very limited. In this study, the dissipation of a.i. (fenpropimorph, pyrimethanil, lindane and chlorpyrifos) on the solid/gas interface was evaluated in a lab-scale wind tunnel. Volatilisation was calculated by an empirical model assuming exponential decay of the volatilisation rate. The obtained residue data were fitted by least square optimization. Residue data was collected over a period of four days.  A difference is observed between the volatilisation of pure a.i. and a.i.-surfactant solution. A higher vapour pressure of the a.i. results in a higher volatilisation and a faster decay of the volatilisation rate. However, addition of a surfactant can significantly decrease the volatilisation rate of the pesticides.

Reduction of post-application pesticide volatilisation by the use of surfactants from glass surfaces

248th National Meeting (2014)

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