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Stable Isotope Laboratory

The Stable Isotope Laboratory (SIL) at Florida International University is a full-service stable isotope facility capable of analyzing stable isotopes of C, N, O, and H in both inorganic and organic solids (soils, tissues) as well as water samples. The SIL provides quality isotopic analyses for both the FIU research community and the South Florida community at large, helping researchers and students use stable isotopic approaches in a variety of biogeochemical projects being conducted in the southeastern US, the Caribbean region, and beyond.

  • Equipment

    An abbreviated list of current SIL equipment includes:

    • Thermo Delta C EA-IRMS
    • Thermo Delta Plus GC-IRMS w/ EA option
    • Thermo Delta V GC-IRMS w/GasBench & TC/EA options
    • Picarro CRDS coupled with an OI TOC system
  • History
    The SIL began in the 80’s with one mass spectrometer, a Micromass Prism. Since then, the laboratory has expanded with the addition of two different IRMS systems. Our lab specializes in continuous flow isotope ratio mass spectrometry (CF-IRMS) using EA, TC/EA, and GC systems. Presently, the laboratory measures C, N, and O isotopes in a variety of organic and inorganic materials, and will begin doing sulfur analyses in the near future. The SIL is a university facility and welcomes all users, and new approaches/methods


Rate (name) Unit Base Internal External
Carbon and Nitrogen Isotope duel Analysis per sample 10 14
Carbon and Nitrogen Isotope duel Analysis with assistance per sample 12 17
Individual Carbon and Nitrogen Isotope per sample 10 15
Individual Carbon and Nitrogen Isotope with assistance per sample 12 17
Compound Specific Carbon Isotope Analysis per day 250 362
Compound Specific Hydrogen Isotope Analysis per day 250 362
Oxygen Isotope Analysis per sample 17 24
Decarbonation Processing per each sample 5 8
13C CRDS Dissolved Organic Carbon per sample 15 22

Have Questions?

You can contact Dr. William Anderson at 305-348-2693 or via email as well as Senior Laboratory Technician John Harris at 305-348-3095 or via email at