01794nas a2200229   4500008003900000245012200039210006900161260001200230300001300242490000700255520108800262653001101350653001401361653001601375653001501391653002101406653001701427100002101444700002201465700002101487856005601508       2008                          d00aThe effect of vegetation on pesticide dissipation from ponded treatment wetlands: Quantification using a simple model0 aeffect of vegetation on pesticide dissipation from ponded treatm  c07/2008  a999-10050 v723 a<p>Field data shows that plants accelerate pesticide dissipation from aquatic systems by increasing sedimentation, biofilm contact and photolysis. In this study, a graphical model was constructed and calibrated with site-specific and supplementary data to describe the loss of two pesticides, endosulfan and fluometuron, from a vegetated and a non-vegetated pond. In the model, the major processes responsible for endosulfan dissipation were alkaline hydrolysis and sedimentation, with the former process being reduced by vegetation and the latter enhanced. Fluometuron dissipation resulted primarily from biofilm reaction and photolysis, both of which were increased by vegetation. Here, greater photolysis under vegetation arose from faster sedimentation and increased light penetration, despite shading. Management options for employing constructed wetlands to polish pesticide-contaminated agricultural runoff are discussed. The lack of easily fulfilled sub-models and data describing the effect of aquatic vegetation on water chemistry and sedimentation is also highlighted.</p>10aCotton10aHerbicide10aInsecticide10aMacrophyte10aPhytoremediation10aRunoff water1 aRose, Michael, T1 aCrossan, Angus, N1 aKennedy, Ivan, R  uhttp://dx.doi.org/10.1016/j.chemosphere.2008.04.059