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- W2024666245 abstract "We tested the reliability of 12‐mL Exetainers (Labco Ltd., High Wycombe, UK) fitted with bromobutyl rubber septa for the storage of a gas sample containing 15 N‐labeled N 2 O and N 2 The gas mixture was analyzed monthly over a 1‐yr storage period by continuous‐flow isotope‐ratio mass spectrometry (IRMS). After a year the N 2 O concentration had decreased by 30% but the change in 15 N enrichment of N 2 O was not detectable. Accurate determination of the N 2 O concentration was possible up to 1 yr if a calibration gas was stored and analyzed along with the test mixture. This technique has wide applicability because diffusive loss of N 2 O as a fraction of starting concentration was predicted by Fick's Law to be almost independent of concentration above 3 μL L −1 The rate of decrease in the enrichment of N 2 as measured by the ratio differences for 29/28 and 30/28 was slow. Decreases were not significantly different from time zero values after storage for 8 wk. After 1 yr of storage the losses of 29 N 2 and 30 N 2 significantly lowered the calculated value for the fraction of the N 2 from the labeled pool ( d ) by about 2% of the initial value, but had no effect on the calculated value for the enrichment of the labeled pool ( 15 X N ). The diffusivity of N 2 O, calculated from loss rate and concentration gradient between Exetainer and atmosphere using Fick's Law, was 40 times higher than that of 29 N 2 or 30 N 2 Nitrous oxide may have been lost from the Exetainer because of adsorption by the septum as well as diffusion through the septum." @default.
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- W2024666245 date "2003-03-01" @default.
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- W2024666245 title "Changes in Composition of Nitrogen-15-Labeled Gases during Storage in Septum-Capped Vials" @default.
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- W2024666245 doi "https://doi.org/10.2136/sssaj2003.5400" @default.
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