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University of California
Stable Isotope Laboratory
Earth and Planetary Sciences
1156 High Street Santa Cruz, CA 95064

Lab: (831) 459-5751
Office: (831) 459-5857
Fax: (831) 459-3074

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Gas Bench δ18O water method description for analyses done at UCSC SIL.

Oxygen isotopic compostion of water was determined by equilibrium exchange of the water oxygen with 0.3% carbon dixoide gas in a predominantly helium headspace environment. A continuous He flow Gas Bench headspace sampling interface is used to dry and isolate the CO2 gas for introduction into a ThermoFinnigan Delta Plus XP isotope ratio mass spectrometer. Analyses were run at the University of California, Santa Cruz Stable Isotope Laboratory. Analytical precison of internationally calibrated in-house standards is better than 0.06 permil for d18O. Sample isotopic values are corrected for drift and source stretching effects.