Introduction to Ozone Instrumentation and Analysis Nate Herbst, Southern Ute Indian Tribe Joe Hameed, ITEP/TAMS

Intro to Instruments and Analysis What type of instrumentation is used? What type of analysis is employed? How is the analysis performed? How does the analyzer work?

Ozone Analyzer Basics Design based on U.V absorption U.V photometry  [O3] Some pictures of the Thermo 49C

Theory of Analysis Ozone absorbs 240nm U.V radiation Dual cell technique  ambient and zero absorptions Zero and ambient absorptions compared Ozone concentration = ambient absorption – zero absorption

U. V. Photometric Absorption Remember: ozone absorbs U.V. Photo courtesy of University of Wisconsin General Chemistry Class. Ozone absorbing U.V radiation. Animation by NASA. Amount of U.V light leaving cell #1 corresponds to [O3] Amount of U.V light leaving cell #2 provides your blank U.V. Lamp Zero air Ambient air Detector

Ozone Analyzer Optical System (Thermo Env. 49C)