Yes, I guess Pier is right. We are doing something similar with D-enriched
water to test tarpaulin in dumps.
If you cannot prepare the water on your own, buying it it is not very
expensive (compared with 18O enriched water).

Good luck

Francesca



At 06.42 13/07/99 -0400, you wrote:
>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
>
>
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Francesca Serra                                         Tel. +39 040 226320
Head of the Centre for Isotope Geochemistry             Fax  +39 040 226320
Geokarst Engineering S.r.l.
AREA Science Park of Trieste
Padriciano
Trieste
I-34012
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