Analysis of Water δD, δ17O, δ18O

 

Summary

We employ the Picarro L2140i water isotope analyzer for analysis of δD, δ17O, and δ18O. We routinely compare results from this instrument to the traditional water fluorination IRMS technique that we also employ.

Reference Materials

We are tied to the VSMOW international scale via VSMOW and SLAP for our water isotope measurements. We maintain a suite of in-house reference waters measured against VSMOW and SLAP using GISP as a quality standard.

Sample submission

If you would like to submit water samples for δD, δ17O, and δ18O analysis, we prefer a minimum of 5 mL of sample in a labeled water tight plastic or glass container. Simple legible sample IDs are appreciated. We need to know if it is fresh or salt water. See the table below for sample analysis pricing. Given the nature of the Δ17O signal, this analysis requires a minimum of three replicates.

Exhaustive description of analysis

300 uL vials are loaded with 200 uL of sample or reference water and placed in a PAL autosampler tray. The δD, δ17O, and δ18O are measured 6-10 times for each vial from a 2 µL water injection. Between each injection, the cavity is purged with dry air and partially evacuated with a small pump.

Suggested reading

  • E. J. Steig, V. Gkinis, A. J. Schauer, S. W. Schoenemann, K. Samek, J. Hoffnagle, K. J. Dennis, S. M. Tan. Calibrated high-precision 17O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance. Atmospheric Meas. Tech. 2014, 7, 2421.
  • S. W. Schoenemann, A. J. Schauer, E. J. Steig. Measurement of SLAP2 and GISP δ17O and proposed VSMOW-SLAP normalization for δ17O and 17Oexcess. Rapid Commun. Mass Spectrom. 2013, 27, 582.

Water δD, δ17O, δ18O Analysis Pricing

All analysis prices are per sample.

  • UW Budget Number,
    User Provided Labor
  • $19
  • To be eligible for this rate, you must provide a UW budget number for billing as well as have the ability and availability to run the sample analysis yourself from start to finish.
  • Method: Cavity ring-down spectroscopy
  • Request analysis
  • Off Campus Funding, User Provided Labor
  • $22
  • To be eligible for this rate, you must have the ability and availability to run the sample analysis yourself from start to finish. Analysis will be paid for through an off-campus address.
  • Method: Cavity ring-down spectroscopy
  • Request analysis
  • UW Budget Number, Lab Provided Labor
  • $33
  • To be eligible for this rate, you must provide the lab with a UW budget number for billing. An IsoLab lab technician will perform the sample analysis for your sample set.
  • Method: Cavity ring-down spectroscopy
  • Request analysis
  • Off Campus Funding, Lab Provided Labor
  • $38
  • This is the lab's default billing rate. We will apply this rate when no UW budget number is provided and your sample analysis was performed by an IsoLab lab technician.
  • Method: Cavity ring-down spectroscopy
  • Request analysis

We welcome individuals from all departments and from on or off the University of Washington campus to visit our facility, and to take advantage of our expertise. Please contact us for more information.