A method has been developed to reliably quantify the isotopic composition of liquid water, requiring only immersion of a ‘ReactIR’ probe in the sample under test. The accuracy and robustness of this method has been extensively tested using a deuterium/protium system, and substantial improvements in sensitivity were obtained using highly novel chemical signal amplification methods demonstrating a standard deviation of 247 ppb D (a δD of 1.6 ‰). This compares favorably with other more costly and time-consuming techniques and is over 20 times more sensitive than any previously published FTIR study. Computational simulations of a model system match the experimental data and show how these methods can be adapted to a tritium/protium system.
Original languageEnglish
JournalAnalytical Chemistry
Early online date29 Apr 2020
Publication statusE-pub ahead of print - 29 Apr 2020

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