Table 3. 18O, 2H and17O abundances of 6 highly enriched18O water portions from Rotem (specified as
> 98%) and Cortec (> 99%).18O abundances are measured by QMS, between brackets
the standard deviation of the repetitions (n) is displayed.2H and 17O abundances are determined
via dilution, and measured with our LGR-LWIA, on two different
measurement days, and with 9 repetitions per measurement day.
* 2H and 17O abundances of
water portion D’ was not remeasured .
Following the determination of the 18O content of the
enriched waters, mixing the enriched water with the SLAP replicate to
produce SLAP-rep-O was performed. The first approach (only mixing with
H218O) was independently performed 4
times, so with 4 different 18O water portions (two
from Rotem and two from Cortec, 18O water portion A
until D). The second approach (mixing first with2H216O and
subsequently with H218O) was performed
once with the same 18O water as used in experiment 4
(18O water portion D). As this portion was opened 4
months before using it the second time, the 18O
concentration was re-measured by QMS (now D’). The second approach was
independently performed with the two remaining 18O
waters as well (1 from Rotem and 1 from Cortec, 18O
water portions E and F).
An illustration, presented in Figure 5, shows the step-by-step procedure
adapted, as described in the sections before, to establish the best
δ18O value for SLAP using measurements performed on
the LGR-LWIA.
<Figure 5>