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@ARTICLE{Weihermller:17683,
      author       = {Weihermüller, L. and Kasteel, R. and Vanderborght, J. and
                      Simunek, J. and Vereecken, H.},
      title        = {{U}ncertainty in pesticide monitoring using suction
                      cups:{E}vidences from numerical simulations},
      journal      = {Vadose zone journal},
      volume       = {10},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-17683},
      pages        = {1287 - 1298},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Knowledge 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.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297377000014},
      doi          = {10.2136/vzj2011.0017},
      url          = {https://juser.fz-juelich.de/record/17683},
}