Lab Facilities:

The UCD stable isotope mass spectrometry lab is a research facility of the Department of Geology of the University of California, Davis.

At present the lab is equipped with a GVI Optima Stable Isotope Ratio Mass Spectrometer (SIRMS).  The Optima has two preparation lines for measuring carbon and oxygen isotopic composition: a combination 44-sample carbonate carousel and acid bath which allows direct CO2 generation from loaded samples, and a 10-port manifold for analysis of samples in ampoules.  The instrument can also be configured to analyze N, O, S or H.

In additional to the Optima, the stable isotope lab has a Finnigan MAT 251 Isotope Ratio Mass Spectrometer, which is designed for C, O, N, S and H gas analyses. A Fredrickson type water equilibrator facilitates analyses of O and H isotopes in aqueous samples.  The MAT 251 uses a single sample manual inlet for analyzing carbon dioxide from ampoules.

In Winter 2005 a new mass spectrometer system will be installed in the facility.  This will include a GVI Isoprime Mass Spectrometer with a 48 bank carbonate rack and a HekaTech/Eurovector glassy carbon reactor for analyses of oxygen stable isotope in phosphates, sulfates, and nitrates.

The laboratory has four vacuum gas handling systems for the off line preparation of a variety of samples to be analyzed on the mass spectrometer.  These include, but are not limited to, dissolved inorganic carbon in water, high precision nitrogen and carbon isotope analyses in organic material, and analyses of carbonates.

Work in the laboratory is aided by the use of four Nikon microscopes used in sample selection and identification, and a Sartorius microbalance capable of resolving sample at a weight of 1 microgram.


copyright 2005