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Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicates

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Cited 1 time in scopus
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Title
Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicates
Other Titles
규산염 표준물질 산소동위원소 비의 국제 상호비교 차이 개선을 위한 2점-표준화 방안
Authors
Kim, Nak Kyu
Park, Changkun
Kusakabe, Minoru
Subject
Chemistry
Keywords
Oxygen three isotope; Silicates; VSMOW-SLAP scaling; Inter-laboratory comparison; Δ′17O
Issue Date
2020-12
Citation
Kim, Nak Kyu, Park, Changkun, Minoru Kusakabe. 2020. "Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicates". JOURNAL OF ANALYTICAL SCIENCE AND TECHNOLOGY, 11(51): 1-14.
Abstract
The δ17O and δ18O values of a number of terrestrial minerals and rocks have been determined using laser fluorination method worldwide. For the comprehensive and congruous interpretation of oxygen isotope data, the δ-values should be normalized by the two-point method (i.e., the VSMOW-SLAP scale) to eliminate inter-laboratory bias. In this study, the δ17O and δ18O values of VSMOW and SLAP were measured to calibrate our laboratory working standard O2 gas. The O2 gas liberated from the water samples was purified using the preparation line normally employed for solid samples, and analyzed by the same mass spectrometer. From the analyses of VSMOW and SLAP, the oxygen isotope compositions of the international silicate standards (UWG2 garnet, NBS28 quartz and San Carlos olivine) were normalized to the VSMOW-SLAP scale (two-point calibration), and then the Δ'17O values were determined. Using the δ-values obtained in this way, the inter-laboratory discrepancy of the δ17O and δ18O results of the silicate standards could be reduced. The VSMOW-SLAP scaling for δ17O and δ18O analysis of silicates provides the most effective way to obtain accurate and precise data. In reporting the Δ'17O values, it is important to make the choice of the reference fractionation line into account because the Δ'17O value is quite variable owing to the slope and y-intercept of the linear relation of the δ-values. The reference fractionation line obtained from the measurement of the low- and high-δ18O reference silicates would help to compare Δ′17O values. We confirmed that the Δ′17O results of the international silicate standards based on the two-point silicate reference line were consistent with the results from other laboratories.
URI
https://repository.kopri.re.kr/handle/201206/11811
DOI
http://dx.doi.org/10.1186/s40543-020-00248-0
Appears in Collections  
2020-2020, Antarctic geology and meteorite research based on the Jangbogo station: Crustal evolution of Victoria Land and characteristics of asteroidal materials (20-20) / Lee, Mi Jung (PE20200)
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