Purdue Stable Isotope Facility

Overview of Services

Many of the PSI lab’s services are now available to researchers at Purdue and elsewhere on a contract basis. Analytical services currently offered include:

  • δ²H and δ18O water analyses (precision < 1‰, 0.2‰)
  • δ18O organic solid analyses on TCEA-IRMS (precision < 0.3‰)
  • δ13C, δ15N, %C, and %N organic and inorganic solids on EA-IRMS (precision < 0.2‰, 0.3‰)
  • δ13C gas from organic respiration on TGA-IRMS (precision < 0.2‰)
  • δ15N and δ18O of denitrifiers on continuous-flow IRMS using headspace extraction (precision < 0.1‰, 0.5‰)
  • δ15N, δ18O, and ∆17O of denitrifiers on continuous-flow IRMS using headspace extraction+gold tube thermal decomposition (precision < 0.4‰, 0.1‰, 0.3‰)
  • A range of chemical and physical sample preparation services



Leadership Personnel

Dr. Greg Michalski, Associate Professor


Dr. Lisa Welp, Assistant Professor



Getting Started

**For Purdue individuals: First-time users should click "Register"; then select "Register using your Purdue Credentials" in upper right.  Returning students will click "Sign In"

**For Non-Purdue individuals: Before you register, you must be assigned a Business Partner Number and given Purdue credentials to register/login.  

    Please contact the center manager for further information.


**In addition, the Purdue Stable Isotope Facility requires 'Access Approval' to use it's core.  

Location and hours of operation

Hours      Location

Monday - Friday 9:00 am - 5:00 pm 

     550 Stadium Mall Dr
     West Lafayette, IN 47907

Links and Resources

  1. Purdue Stable Isotope Facility


Name Role Phone Email Location
Dr. Greg Michalski
Associate Professor

Dr. Lisa Welp
Assistant Professor