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SUMMARY:Sensor Design for Aquatic Systems Analysis
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20194001T000000
UID:2026-04-17-14-07-47@natsci.colostate.edu
DTSTAMP:20260417T140747
Description:About the Seminar\n\nIt is widely recognized that dynamic envir
 onmental systems should preferably be monitored in situ\, as traditional s
 ampling and off-site analysis will invariably alter local equilibria\, esp
 ecially with chemical species that are kinetically labile and reactive. Un
 fortunately\, very few such species can today be monitored reliably\, as o
 nly pH sensors are integrated in the ubiquitous CTD (conductivity–temper
 ature–depth) probes.\n\nThis presentation will show how advances in fund
 amental concepts in our chemical research laboratory are being integrated 
 into field deployable devices. Development of all solid state ion sensors 
 have recently made it possible to construct robust in situ potentiometric 
 sensing probes\, for example for the profiling of ammonium in stratified l
 akes. Exhaustive thin layer electrochemistry started out as a fundamental 
 idea to achieve increased robustness\, as Faraday\\'s law dictates that th
 is is a potentially calibration free method. It has now been demonstrated 
 in freshwater and marine field deployments to be a promising methodology f
 or the direct detection of total alkalinity and chlorinity. Thin layer ele
 ctrochemistry provides an attractive solution for in line desalination and
  acidification\, allowing one to detect nutrients in seawater by direct po
 tentiometry.\n\nThe last part of the talk will move the discussion to the 
 development of imaging tools for the spatially resolved observation of che
 mical dynamics. Our group is currently working on closed bipolar electrode
 s to achieve this goal\, using an array of ion-selective electrodes that a
 re electrically detached from the power source. This may allow one eventua
 lly to control an array of sensors by a single potentiostat and using imag
 ing cameras for detection.\n\nAbout the Speaker\n\nEric Bakker is professo
 r of analytical chemistry at the University of Geneva. He earned his Ph.D.
  at ETH Zurich in Switzerland in 1993 and subsequently spend 14 years in t
 he U.S.\, initially for a postdoc at the University of Michigan\, then a t
 enure track faculty position Auburn University where he rose to the rank o
 f full professor. He then moved to Purdue University in West Lafayette and
  left the U.S. for Curtin University in Perth\, Australia before moving to
  his current position in Switzerland in 2010. His research interests are i
 n Analytical Chemistry\, particularly the use of molecular recognition and
  phase transfer principles to design optical and electrochemical sensors. 
 In recent years\, his main interest was to apply sensor concepts for in si
 tu environmental analysis. He has published over 300 papers that have been
  globally cited more than 20\,000 times. He serves as an Associate Editor 
 for the journal ACS Sensors. 4:00 pm
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