The stable isotope laboratory houses mass spectrometers for the analysis of carbonates, water, and organic compounds. Four mass spectrometers are currently in use: 1) one Elementar Isoprime 100 w/ dual inlet and multiprep for oxygen isotope (d18O) and carbonate isotope (d13C) analysis of larger carbonate samples, d18O and dD (hydrogen isotopes) of water, and a 10 collector isotopologue array for the analysis of multiply substituted isotopes of CO2. 2) A Thermo Delta V+ w/ dual inlet and Kiel IV, and Gasbench II continuous flow operating modes to analyze smaller carbonate samples and water samples requiring high precision; 3) A Thermo Delta V+ w/ Conflo IV, Trace GC and Isolink, TC/EA, Costech EA w/autosampler and configured for the stable isotopic (d18O, d13C, d15N, dD) analysis of bulk and compound-specific organics and tree ring samples; 4) one VG Optima dual-inlet mass spectrometer for the analysis of carbonates.