EGU24-13866, updated on 09 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Laser absorption spectroscopy-based ultraportable analyzer for δ18O and δ2H in water.

Akshay Nataraj1, Susan Fortson2, Frederic Despagne3, Julio Lobo Neto2, and Doug Baer2
Akshay Nataraj et al.
  • 1ABB Inc, 3400, Pierre-Ardouin, Quebec G1P 0B2, Canada (
  • 2ABB Inc, 3055 Orchard Drive, San Jose, California 95134, United States
  • 3ABB Inc, 4 avenue Charles Lindbergh Merignac, Gironde 33700, France

Stable isotope analysis of water 2H2O and H218O are powerful tracers to understand the different hydrological processes like ecohydrological processes, and hydroclimatic processes [1]. The measurement of δ2H and δ18O in water samples using laser-based absorption techniques is adopted increasingly in hydrologic and environmental studies. In contrast to the conventional Isotope ratio mass spectrometry (IRMS) technique, optical absorption spectroscopic techniques allow the realization of isotopologue-specific, non-destructive, and compact spectrometers with short analysis times with high-precision capabilities.

ABB’s ultraportable water analyzers are compact, portable field-deployable laser spectrometers capable of making continuous, high-frequency measurements of δ18O and δ2H from multiple water sources. The instrument is based on Off-Axis Integrated Cavity Output Spectroscopy (OA-ICOS) technique [2]. These analyzers are capable of measuring liquid water (GLA132-LWIA) or vapor (GLA132-WVIA).  They are rugged and designed to handle both natural and isotopically enriched water samples.  Users can leverage the precision and speed of the GLA132-LWIA by coupling it with a portable auto-injector to perform automated, unattended injection patterns on multiple samples.

An important asset of this innovative approach based on OA-ICOS technology coupled with the portable auto-injector technology is its sample throughput, which allows one to measure approximately 90 samples a day corresponding to 720 injections each with a sample volume of 0.5 µL per injection per day. The precision (1σ) achieved corresponds to 0.6 ‰ for δ2H and 0.2 ‰ for δ18O. The analyzer’s ease of use, field portability, durability, and high throughput make it an excellent choice for reliable, high-performance measurement of freshly collected samples in the field, thereby opening a plethora of applications to understand the different processing governing the earth’s climate.

[1] Tian, C.,et al., Sci Rep 8, 6712 (2018).

[2] A. O’Keefe, et al., Chemical Physics Letters, vol. 307, no. 5, pp. 343–349, Jul. 1999, doi: 10.1016/S0009-2614(99)00547-3.

How to cite: Nataraj, A., Fortson, S., Despagne, F., Lobo Neto, J., and Baer, D.: Laser absorption spectroscopy-based ultraportable analyzer for δ18O and δ2H in water., EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13866,, 2024.