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SUMMARY:Passive samplers for polar organic compounds – strengths and wea
 knesses
DTSTART:20130312T161500
DTEND:20130312T171500
DTSTAMP:20260406T063905Z
UID:eec494c634104f2a7020a3f08804991b8ac4813be242e1d57db38e00
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Etienne Vermeirssen\, Centre Ecotox EAWAG\nPassive samplers
 \, when placed in lake or river water or in effluent streams\, will take u
 p chemicals that can subsequently be identified and quantified in passive 
 sampler extracts.  In this way\, these sampling devices can serve as a mo
 re robust or more economical alternative to traditional methods such as gr
 ab or automated water sampling or the sampling of biota.  Compared to oth
 er sampling techniques\, passive sampler extracts often allow for an impro
 ved detection of compounds of interest.  Furthermore\, in the ideal scena
 rio\, a passive sampler provides an accurate estimate of the time weighted
  average water (TWA) concentration.   The calculation of TWA concentrati
 ons requires information on uptake kinetics (sampling rates).  Therefore\
 , passive samplers are calibrated in the lab prior to their application in
  the field.  As calibration conditions in the lab rarely match conditions
  during field deployments\, there are always uncertainties associated with
  TWA concentrations.  For example\, environmental conditions in the field
  such as the flow rate or temperature directly affect uptake processes and
  thus TWA values.\nIn this seminar\, an overview will be given on the back
 ground and use of two polar organic samplers: POCIS and Chemcatcher.  Inf
 ormation on calibration\, uptake kinetics\, and field applications will be
  pulled together to highlight strengths and weaknesses of the sampling tec
 hnique.  Examples will cover LC-MS/MS data coming from laboratory experim
 ents\, where samplers were exposed to know cocktails of chemicals\, and fi
 eld studies where passive sampler extracts were analysed by means of diffe
 rent biological assays.
LOCATION:GR A3 32 http://plan.epfl.ch/?room=GR%20A3%2032
STATUS:CONFIRMED
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