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Triple-isotope calibration of in-house water standards supplemented by determination of 17O content of USGS49-50 reference materials using cavity ring-down laser spectrometry

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journal contribution
posted on 2021-01-29, 10:40 authored by Anna Pierchala, Kazimierz Rozanski, Marek Dulinski, Zbigniew Gorczyca, Robert Czub

The procedure of calibrating in-house water standards suitable for routine analyses of triple-isotope composition of water samples using Picarro L2140-i CRDS analyser is presented and discussed. Such standards are indispensable for achieving and maintaining high quality of isotope analyses of water in terms of their precision and accuracy. A set of seven different water standards consisting of three in-house standards and four secondary standards commercially available was calibrated against VSMOW2/SLAP2 primary reference materials. The calibrated standards cover a wide range of isotopic composition, with δ values ranging from close to zero to the values comparable with SLAP2. The apparent consistency of the calibrated values of δ2H, δ18O and d-excess with corresponding certified values for commercially available USGS47-50 standards and the consistency of the calibrated values of δ17O and Δ17O with its literature values for USGS47-48 standards confirm the high quality of the performed calibration. Moreover, the calibration exercise allowed to obtain δ17O and Δ17O values for USGS49 and USGS50 standards, not reported so far.

Funding

This work was supported through funding from the National Science Centre [grant Number UMO-2016/23/B/ST10/00909] and the subsidy from the Ministry of Science and Higher Education [grant number 16.16.220.842 B02].

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