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Novel Sample Pre-treatment Method for Improved Isotope Ratio Infrared Spectroscopy Measurement Princeton Docket # 16-3212-1Researchers at Princeton University, Department of Civil & Environmental Engineering, have developed a method to reduce spectral interference of organic contaminants in isotope ratio infrared spectroscopy (IRIS) through the use of solid phase extraction (SPE) technique.IRIS is used for the stable hydrogen and oxygen isotope... Published: 12/21/2022   |   Inventor(s): Elliot Chang, Kelly Caylor, Adam Wolf Keywords(s): earth science, gas sensing, water Category(s): Mechanical/Electrical Engineering