Carbon and oxygen isotopic composition of a recent megapolygon-spelean limestone, fisheman by, South Australia

Ferguson, J.; Chambers, L. A.; Burne, Robert V.

doi:10.1016/0168-9622(88)90037-1

Cited by 2 publications

(3 citation statements)

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“…Based on literature reports,1–33 the isotopic analysis of oxygen is more generally carried out as $\hbox{CO}_{2}^{+}$ than as $\hbox{O}_{2}^{+}$ , irrespective of whether the interest is in the Z value alone or in both Y and Z simultaneously. However, we have shown37 recently that accurate simultaneous determination of the oxygen isotopic ratios (Y and Z), specifically in samples of terrestrial origin, by employing $\hbox{CO}_{2}^{+}$ as the monitor species is extremely difficult.…”

Section: Resultsmentioning

confidence: 99%

“…The atomic analysis of oxygen is most conveniently carried out using one of its molecular ions (e.g. $\hbox{O}_{2}^{+}$ or CO + or $\hbox{CO}_{2}^{+}$ ) rather than its, as expected, atomic ions as the mass spectrometric monitor species,1–33 and the technique of analysis is referred to generally as the molecular ion beam method (MIBM) 34. That is, in practice, the actual abundance measurements are carried out on the chosen isotopic molecular ions instead of the required isotopic O + or O − ions of the sample (oxygen) to be analyzed.…”

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confidence: 99%

“…However, usually, no investigation is carried out as to whether, or as to what extent, the deviation of Z SAM from Z STD could be due to contributions from experimental errors only. Nor it is clarified in the existing literature1–32 whether the involvement of data processing (viz. Z = F(R i ) or {f i (Y, Z) = R i , i = 1, 2}) in analysis can affect in any possible way the desired result(s).…”

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confidence: 99%

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Error magnification factors in the isotopic analysis of oxygen as O: possibility of determining true isotopic abundance ratios

Datta

2001

Rapid Comm Mass Spectrometry

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The simultaneous determination of the 17O/16O abundance ratio (Y) and 18O/16O ratio (Z) as $\hbox{\bf O}_{\bf2}^{+}$ is carried out by solving a set of equations: where Ri's are the measured abundance ratios of chosen pairs (say, j and k) of isotopic $\hbox{\bf O}_{\bf 2}^{+}$ ions. The measured ratios (Rj and Rk) are always subject to some errors (δj and δk), and hence the corresponding results of analysis (solutions: Y and Z) will inevitably be at errors (δY and δZ). Recently, we have shown that the errors δY and δZ are always expected to be different from those of the experimental errors δj and δk, and are correlated as: where the parameter $\hbox{\bf[REMF]}_{\bf jk}^{\bf E}$ is referred to as the relative error magnification factor of analysis. This work investigates the parameters $\hbox{\bf[REMF]}_{\bf jk}^{\bf Y}$ and $\hbox{\bf[REMF]}_{\bf jk}^{\bf Z}$ (the error magnification factors in determining the oxygen isotopic ratios, Y and Z simultaneously, as $\hbox{\bf O}_{\bf 2}^{+}$), which control, for any given values of δj and δk, the achievable accuracy of the desired results (determined values of Y and Z). The variations of the REMFs as a function of the choice of isotopic molecular pairs j and k, and/or some other parameters, are evaluated and presented.The studies predict that although, depending on different possible parameters of analysis, the REMFs can have any values between 0 and (almost) ∞, it should not be at all difficult in case of a real analysis to pre‐select the analytical conditions so that the REMFs take roughly the desired values (i.e. ≤1). It is shown further that, compared to some other molecular species of oxygen such as the $\hbox{\bf CO}_{\bf 2}^{+}$ ions which are more commonly used than the $\hbox{\bf O}_{\bf2}^{+}$ ions themselves as the monitor species for the isotopic analysis of oxygen, the $\hbox{\bf O}_{\bf 2}^{+}$ ions have better properties as the required monitors ions (i.e. $\{\hbox{\bf [REMF]}_{{\bf O}_{2}^{+}}^{\bf E}\} < \{\hbox{\bf [REMF]}_{{\bf CO}_{\bf 2}^{+}}^{\bf E}\}$). Also, choice of the $\hbox{\bf O}_{\bf 2}^{+}$ ions as the monitors (j and k) is expected to yield results close to the true isotopic composition of the analyte oxygen, i.e. it is predicted to be possible in practice to achieve both $\hbox{\bf [REMF]}_{{\bf O}_{\bf 2}^{+}}^{\rm Y}$ and $\hbox{\bf [REMF]}_{{\bf O}_{\bf2}^{+}}^{\bf Z}$ substantially less than unity. Copyright © 2001 John Wiley & Sons, Ltd.

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