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Influence of adsorption-desorption phenomena on pesticide run-off from soil using simulated rainfall

Abstract : The surface runoff of a number of pesticides (diuron, isoproturon, atrazine, alachlor, aclonifen, trifluralin, lindane and simazine), chosen for their range of adsorption behaviours, was studied using simulated rainfall applied to small plots over a short time (one hour). Pesticides were applied together onto bare soil using two different sandy loam soils from La Jaillière and Coët Dan sites in France. The surface runoff samples were collected throughout the running of the event and concentrations of pesticides were measured in both liquid and solid phases. Sorption isotherms for isoproturon and diuron on La Jaillière soil as well as eroded particles were measured under equilibrium conditions and compared to their partinioning during surface runoff. At the rainfall intensity used, both soils generated a large load of eroded particles. The average runoff flow rate increased with time for La Jaillière soil while it remained relatively constant at a higher level for the Coët Dan soil. The concentrations of each pesticide in the runoff samples decreased as the experiment proceeded. The pesticides were classified into two types by their partinioning between the liquid and solid phases. Atrazine, simazine, diuron, isoproturon and alachlor were mainly transported in surface runoff water. By contrast 90% of trifluralin and aclonifen was adsorbed onto eroded particles. Lindane was intermediate with a 37% adsorption level. When the contribution of eroded particles was minor, the agronomical concentrations were inversely proportional to the water flow rate. We have proposed a model that describes the mass of chemicals extracted from the soil into surface water during a surface runoff event of a given average duration and flow rate. This model takes into account the dilution of the soil solution and the desorption of chemicals through two parameters called respectively the dilution factor and the extraction retardation factor. The desorption kinetic was the limiting step in the surface runoff of weakly sorbed chemicals such as isoproturon.
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Submitted on : Thursday, May 14, 2020 - 7:05:27 PM
Last modification on : Saturday, April 10, 2021 - 3:31:44 AM


  • HAL Id : hal-02578754, version 1
  • IRSTEA : PUB00007599



Véronique Gouy, J.-C. Thoisy-Dur, Raoul Calvet, R. Belamie, Véronique Chaplain. Influence of adsorption-desorption phenomena on pesticide run-off from soil using simulated rainfall. Journal of Pesticide Science, Pesticide Science Society of Japan, 1999, pp.175-182. ⟨hal-02578754⟩



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