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2374CHEMISTRY AT EAWAG 941 CHIMIA5/11997INr 1:!(Dczember)
 

Summary: 2374CHEMISTRY AT EAWAG 941
CHIMIA5/11997INr 1:!(Dczember)
1
Chimia 51 (1997) 941-946
(1;)Neue Sch,,'ei~erische Chemische Gesellschaft
ISSN 0009-4293
Markus Hofer:!)*, Werner Aeschbach-Hertig:!),Urs Beyerle:!),
StefanB. Haderleinb),Eduard Hoehnb),Thomas B. Hofstetterb),
Annette JohnsonC),Rolf Kipfer), Andrea Ulrichd), and Dieter M. Imboden:!)
Abstract. In complex environmentalsystems,tracersare indispensabletools for the
investigationof various physical,chemical,andbiological processes.Fromthelarge
varietyof tracersemployedby EAWAG intheaquaticenvironment,we presentsome
examplesrel~\'~:1tto ground..':aterresearch.Sometracers(e.g.,2:!:!Rn,3II/3He,chlo-
rofluorocarbons)allow the time sincegroundwaterinfiltration to bedetermined;this
informationcanbeusedto quantifyprocessratessuchasflow velocities,rechargeand
reactionrates.Othertracers(e.g.,conductivity,isotopesof oxygenor boron)canbe
usedto quantifymixing ratiosbetweenwatersof different origin, for instance,to study
theadmixtureof leachatefrom a landfill to anaquifer.In contrasttotheseinerttracers,
chemically reactive tracers (e.g., nitroaromatic compounds)can be used to study
subsurfacebiogeochemicaltransformationprocesses,e.g. the reductionof contami-

  

Source: Aeschbach-Hertig, Werner - Institut für Umweltphysik, Universität Heidelberg

 

Collections: Geosciences; Environmental Sciences and Ecology