High-precision triple oxygen isotope research in water is finally simple and affordable.

• Streamlined, simple and simultaneous measurement of δ18O, δ17O, δD and 17O-excess in liquids and vapor at the touch of a button.

• Average to < 15 per meg precision on 17O-excess for 1 hour vapor measurements.

• Repeat measurements demonstrate 15 per meg precision on 17O-excess for liquids.

High precision measurements of δ18O and δD in water are critical for demanding applications such as paleoclimatology and oceanography, and scientists have learned a significant amount by measuring water isotopes in liquids, vapor and solids.

But, by only measuring two isotopes of oxygen an additional tracer, 17O-excess, is overlooked. 17O-excess can be used to enhance our understanding of present day climate, the interactions between the hydrosphere and biosphere, and it can be used to reconstruct climates of the past. The Picarro L2140-i enables simultaneous measurements of δD, δ18O and δ17O, and determines 17O-excess to sub 15 per meg (< 0.015 ‰) precision.

For the majority of applications, including paleoclimate, (eco)hydrology and atmospheric science, the ability to measure δ17O is not sufficient. Instead, we must quantify very small deviations (or “17O-excess”) in the amount of 17O in a sample, as compared to the expectation for that sample. In the natural world, these deviations, span a range of less than 0.1 ‰.

Until now, high precision measurements of all three isotopes of oxygen (16O, 18O and 17O) has been limited to highly specialized labs with complex sample preparation systems that convert H2O to O2 for analysis by isotope ratio mass spectrometry (IRMS). The Picarro L2140-i now delivers precisions of 15 per meg or better on 17O-excess at the touch of button. Introduce water directly into the analyzer – either directly as vapor or using a vaporization process that converts liquid water to vapor. This streamlined, simple and simultaneous measurement of δD, δ18O, δ17O and 17O-excess delivers a tool for increasing the accessibility of triple oxygen isotope research, and enables scientists to expand 17O-excess data sets and probe the natural world through targeted experiments and field campaigns

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