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@ARTICLE{Mertens:62065,
      author       = {Mertens, J. and Tuts, V. and Diels, J. and Vanderborght, J.
                      and Feyen, J. and Merckx, R.},
      title        = {{D}esign and testing of a drop counter for use in vadose
                      zone water samplers},
      journal      = {Vadose zone journal},
      volume       = {7},
      issn         = {1539-1663},
      address      = {Madison, Wis.},
      publisher    = {SSSA},
      reportid     = {PreJuSER-62065},
      pages        = {434 - 438},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Measuring leachate mobility in the vadose zone is necessary
                      to understand the processes controlling groundwater and
                      river contamination, and requires recording leachate volumes
                      with time. Many field studies manually measure the volume of
                      leachate with a daily, weekly, or even biweekly resolution;
                      however, measurement of leachate at higher temporal
                      resolution is needed for the calibration of solute transport
                      models and is useful in identifying the contribution of
                      preferential flow to solute transport. We designed a simple,
                      robust, and low-cost drop counter for measuring leachate
                      volumes at a high temporal resolution. Laboratory
                      experiments showed a nearly perfect linear relationship
                      between the applied flux and the number of drops per unit
                      time, and indicate an average drop size of 35 mu L. Due to
                      manual manufacturing, variability between drop counters is
                      not negligible and a one-point calibration is necessary. The
                      drop counter consists of an upper (guiding) tube from which
                      a drop forms and a lower (capillary) tube that "sucks" the
                      drop down before it falls. The presence of the lower tube
                      makes the counter less vulnerable to temperature and ionic
                      strength effects of the leachate. Counting of the drops can
                      be easily achieved using any type of datalogger capable of
                      logging electrical pulses.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Nachhaltige Entwicklung und Technik},
      pid          = {G:(DE-Juel1)FUEK408},
      shelfmark    = {Environmental Sciences / Soil Science / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000256204600005},
      doi          = {10.2136/vzj2007.0096},
      url          = {https://juser.fz-juelich.de/record/62065},
}