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000017683 0247_ $$2DOI$$a10.2136/vzj2011.0017
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000017683 041__ $$aeng
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000017683 084__ $$2WoS$$aEnvironmental Sciences
000017683 084__ $$2WoS$$aSoil Science
000017683 084__ $$2WoS$$aWater Resources
000017683 1001_ $$0P:(DE-Juel1)VDB17057$$aWeihermüller, L.$$b0$$uFZJ
000017683 245__ $$aUncertainty in pesticide monitoring using suction cups:Evidences from numerical simulations
000017683 260__ $$aMadison, Wis.$$bSSSA$$c2011
000017683 300__ $$a1287 - 1298
000017683 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000017683 440_0 $$010301$$aVadose Zone Journal$$v10$$x1539-1663$$y4
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000017683 520__ $$aKnowledge of the spatial and temporal distribution of pesticide concentrations is essential for pesticide registration. In field experiments performed during the registration procedure, suctions cups are widely used to monitor the evolution of pesticide leaching over time and to calculate the mean concentration for a given drainage period. Until now, there has been no detailed information regarding whether soil water sampling by suction cups is suitable for accurately predicting the field-scale leaching of pesticides in heterogeneous soils. To address this, we performed a numerical study to evaluate the uncertainties associated with suction cup sampling in heterogeneous soils under atmospheric boundary conditions using two pesticides with contrasting sorption and degradation properties. To address the two main operation modes of suction cup sampling, continuous and weekly sampling were analyzed. First, the variability of pesticide breakthrough concentrations was analyzed for a single pesticide application in a physically heterogeneous soil profile. Second, a 10-yr time series was used to analyze repeated pesticide applications, and estimate variability in the leached mass fraction (LMF) and mean concentrations. In both cases, pesticide break-through was compared to the breakthrough of an inert tracer. The results indicate that for a single pesticide application, pore water velocities varied only slightly for all operation sampling modes and compounds. On the other hand, the total extracted mass and LMF varied greatly, suggesting that the acceleration of the breakthrough sampled by suction cups plays an important role in terms of LMF and the mean concentration, especially for degradable substances.
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000017683 7001_ $$0P:(DE-Juel1)VDB724$$aKasteel, R.$$b1$$uFZJ
000017683 7001_ $$0P:(DE-Juel1)129548$$aVanderborght, J.$$b2$$uFZJ
000017683 7001_ $$0P:(DE-HGF)0$$aSimunek, J.$$b3
000017683 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b4$$uFZJ
000017683 773__ $$0PERI:(DE-600)2088189-7$$a10.2136/vzj2011.0017$$gVol. 10, p. 1287 - 1298$$p1287 - 1298$$q10<1287 - 1298$$tVadose zone journal$$v10$$x1539-1663$$y2011
000017683 8567_ $$uhttp://dx.doi.org/10.2136/vzj2011.0017
000017683 909CO $$ooai:juser.fz-juelich.de:17683$$pVDB$$pVDB:Earth_Environment
000017683 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
000017683 9132_ $$0G:(DE-HGF)POF3-259H$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$aDE-HGF$$bMarine, Küsten- und Polare Systeme$$lTerrestrische Umwelt$$vAddenda$$x0
000017683 9141_ $$y2011
000017683 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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