We are fortunate to have a Picarro L2130i cavity ringdown spectrometer in our new lab here in the Keck Center for Science and Engineering here at Chapman University. The instrument can analyze stable isotopes of oxygen and hydrogen in water vapor or liquid samples via the autosampler (with a dry nitrogen carrier gas). The lab has a number of in-house standards that span the range of typical waters at natural abundance. Many labs are not running highly enriched or depleted liquid samples right now due to memory effects; these problems can be solved with a particularly rigorous approach to sample injection and careful choice of standards; we are willing to take the time to run those samples. We are happy to serve as a resource for the community - please reach out if you have analyses in mind.
We also have the ability to extract water from environmental samples (e.g. soil, plants, and other biological tissue) using the method proposed by Koeniger et al. (2011 in RCMS). The basic principle is that a sample under vacuum is heated in the dry block heater and the evaporated water is in turn condensed in liquid nitrogen. This approach has not been as widely applied as cryogenic vacuum distillation systems built with glass or metal manifolds; however, the principles of use are identical. Again, we are happy to serve as a resource for the community - please reach out if you have analyses in mind or if you would like the parts list that we developed for how to build this instrumentation.