Fig. 7. Comparison of the m /z 28, 29 and 30
traces in the sequence of consecutive measurements of NBS28_FO6. Red
arrows represent the positions of CO peak ends.
The oxygen yields and δ18O values obtained from
samples with different recipes are summarized in Table 3. Note that the
samples showing the anomalous yields described above (sample run order
#16–18, #24, #32, #40, #48, #57, and #66 in Fig. 6) were removed
from this summary. Based on the observed δ18O of
standards (NBS18, IAEA-601, and -602) and their reference values, a
calibration curve was determined as follows:\(\delta^{18}O_{\text{reference}}=1.00588\times\delta^{18}O_{\text{observed}}-0.00587,\ R^{2}=0.99998\)(Fig. 8). Then, δ18O of the silicates were calibrated.
Table 3 also shows 1σ of standard deviation of yields and
δ18O values.
Table 3. Oxygen yields and δ18O of silicate
samples at different method