Ed Kaplan used water with a d18O value of about -940 per mill and a
d2H value of +67,000 per mill in a program to test two multilevel
passive ground-water sampling systems in South Carolina.  You can
obtain additional information from him at:

   Ed Kaplan
   Brookhaven National Laboratory
   Building 703M
   Upton, New York  11973
   Phone:  +1 516 344 2007

>Hello all,
>
>I have a rather naive question to ask everyone today.  Has anyone ever used
>18O enriched or depleted water as a conservative tracer for field injection
>experiments into aquifers?  We are performing a Br- tracer injection
>experiment into a sandy aquifer and concerns about Br- reactivity with
>Fe-Al oxyhydroxides
>has us looking for another conservative tracer.  My one concern about
>attempting to use the del18O of water is the potential of oxygen isotope
>exchange with soil CO2?  Our injection zone is 5 meters below the water
>table, we will be sampling over a horizontal distance of 7 meters, and our
>forced gradient ground water velocity will be 1 meter/day.  We will be
>injecting about 2000 liters in 12 hours and then monitor the plume for
>about a week.  It seems feasible, but I wonder if I'm missing something
>obvious (like where do I get 2000 liters of isotopic distinct H2O, drive to
>Alaska and bring back a lorrie load of snow?).  As always, any advice or
>relevant citations would be most
>appreciated.
>
>Many thanks, TC Onstott
>
>I HAVE A NEW EMAIL ADDRESS
>T.C. Onstott
>Dept. of Geosciences
>Princeton University, Princeton NJ 08544
>Ph: 609-258-1622
>FX: 609-258-1274
>e-mail: [log in to unmask]
>Check out our website at http://geo.princeton.edu/geomicrobio
>