Analysis of Water δD, δ18O

 

Summary

We employ two Picarro liquid water laser analyzers dedicated to measuring δD and δ18O of water.

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 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.

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 and δ18O are measured 6-10 times for each vial from 1 µL of water per injection. Between each injection, the cavity is purged with dry air and partially evacuated with a small pump.

Suggested reading

  • O'Keefe A, Deacon DAG. Cavity ringdown optical spectrometer for absorption measurements using pulsed laser sources. Review of Scientific Instruments, 59, 2544 (1988). doi: 10.1063/1.1139895
  • Zalicki P, Zare RN. Cavity ringdown spectroscopy for quantitative absorption measurements. Journal of Chemical Physics, 102, 2708 (1995). doi: 10.1063/1.468647
  • Gupta P, Noone D, Galewsky J, Sweeney C, Vaughn BH. Demonstration of high-precision continuous measurements of water vapor isotopologues in laboratory and remote field deployments using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) technology. Rapid Commun. Mass Spectrom. 23, 2534 (2009). doi: 10.1002/rcm.4100

Water δD, δ18O Analysis Pricing

All analysis prices are per sample.

  • UW Budget Number,
    User Provided Labor
  • $8
  • 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
  • Rates double for the analysis of sample sets containing less than 10 samples.
  • Request analysis

    Or I have a user account and I want to check in my samples.
  • Off Campus Funding, User Provided Labor
  • $9
  • 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
  • Rates double for the analysis of sample sets containing less than 10 samples.
  • Request analysis

    Or I have a user account and I want to check in my samples.
  • UW Budget Number, Lab Provided Labor
  • $9
  • 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
  • Rates double for the analysis of sample sets containing less than 10 samples.
  • Request analysis

    Or I have a user account and I want to check in my samples.
  • Off Campus Funding, Lab Provided Labor
  • $10
  • 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
  • Rates double for the analysis of sample sets containing less than 10 samples.
  • Request analysis

    Or I have a user account and I want to check in my samples.

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.

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