A CAVITY RINGDOWN SPECTROSCOPY MERCURY CONTINUOUS EMISSION MONITOR Page: 3 of 13
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Section 1: Introduction
The objective of this project is an innovative science-driven technology program to develop a prototype
instrument that exploits the full potential of Cavity Ring-Down spectroscopy (CRD) as a powerful new
analytical technique for the detection of ultra-trace levels of mercury.
The core effort focuses on the optimization and evaluation of a laboratory CRD spectrometer for gaseous
mercury detection. Detection limits, calibration and appropriate analytical procedures will be established.
The impact of individual interferent gases expected in flue gas emissions from advanced power plants
will be determined. Upon testing of the individual gases a simulated flue gas steam consisting of a
mixture of all expected flue gas components will be tested to determine combined interferences as well as
mercury detection limits. While the primary concern of this project is the determination of the total
mercury content of flue gas emissions, approaches to determine mercury speciation will also be
investigated. A sampling interface will be designed, built, and integrated into the CRD spectrometer to
provide a continuous sample stream from the flue gas stack to the cavity of the CRD instrument.
A summary of the major tasks is described below:
Task 1: Mercury (Hg) CRD System Development. Design and construct CRD system for optimum
Task 2: Software Modification. Modify an existing LabView software package to analyze the data and
control the 50 Hz laser and sampling system.
Task 3: Hg-CRD System Optimization. Determine the optimum operating conditions of the
spectrometer, establish the sensitivity of the technique in terms of detection limits, and evaluate the effect
of typical interferents. Develop and test a mercury speciation system to insure detection of total mercury
Task 4: Sampling Interface. Design and build the sampling system for delivery of sample gas to and
from the mercury speciation system.
Task 5: Integration of Sampling System. Combine sampling system and spectrometer and determine
impact, if any, on the instruments performance.
Task 6: Formalize Hg-CRD Analytical Procedures. Establish and formalize operating parameters and
calibration procedures to provide validation of the results to meet the requirements necessary to allow
comparison of the instrument performance with either EPA Reference 29 or the Ontario Hydro methods.
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Christopher C. Carter, Ph.D. A CAVITY RINGDOWN SPECTROSCOPY MERCURY CONTINUOUS EMISSION MONITOR, report, October 1, 2002; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc742672/m1/3/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.