Reference Materials: We are tied to the VSMOW international scale via VSMOW and SLAP for our water isotope measurements.
Sample submission: If you would like to submit water samples for δD and δ18O analysis, we prefer a minimum of 5 mL of frozen sample in a labeled water tight plastic container that is large enough and strong enough to withstand water expansion upon freezing. Simple legible sample IDs are appreciated. We need to know if it is fresh or salt water. Please include in your shipment container the following form (pdf or doc) and email Andy.
Exhaustive description of analysis: Vials are loaded with 1 mL of sample or reference water and placed in a PAL autosampler tray. The δD and δ18O are measured three times for each vial from 1 µL of water per injection. Between each injection, the cavity is purged with dry nitrogen gas and partially evacuated with a small pump.