Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility Page: 4 of 25
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Teflon differential pressure flow cell, so that the gas flow rate and temperature of the primary
sample can be monitored. The sampling probe, sample line, and sampling chamber were
operated at approximately 110 C during the test at EPA.
A secondary sample is drawn isokinetically from the gas flowing through the sampling
chamber using a 4"-OD Teflon sampling tube that is inserted approximately 10 cm into the end
of the chamber. The tube has a 0.51-cm ID, with a 300 taper at the sampling end. The outlet
side of the sampling tube is connected to a 1%" Teflon Swagelok tee that is followed by another
Teflon differential pressure flow cell, to monitor the gas flow rate out of the sampling chamber.
A Teflon-coated thermocouple (Omega) is inserted into the inlet of this flow cell to measure the
gas temperature. The differential pressure is monitored using an oil-filled manometer (Dwyer
Instrument model 101) that has a range of 0-0.5" of water. The primary flow cell, Teflon
sampling chamber, and secondary flow cell are heat-traced using electrical heating tape inside an
insulated tube (Accessible Products Company). A linear pump (Gast Manufacturing model SPP-
6GAS-101) is used to draw a sample flow of approximately 1 standard Lpm out of the sampling
chamber and through the 1-m absorption cell, for the determination of Hg in the stack gas.
Mercury CEM The Hg CEM system was assembled and tested at Ames Laboratory and
used for stack Hg monitoring during an FY00 field test at the Diagnostic Instrumentation and
Analysis Laboratory (DIAL) at Mississippi State University.4 The Hg CEM was modified in
FY01 to sequentially monitor elemental and total (oxidized plus elemental) Hg and tested at the
EPA-Rotary Kiln in Durham, NC. Mercury is detected as elemental Hg by atomic absorption in
a 1-m pathlength absorption cell, using a Hg pen lamp as the light source, a 0.38-m focal-length
echelle spectrometer, and a photodiode array (PDA) detector. This echelle spectrometer has no
cross-dispersing optical element or order-sorting pre-filter, so all orders of the echelle grating are
spatially superimposed at the detector. This spectrometer provides simultaneous detection of all
of the strong Hg lines from 253-579 nm from the pen lamp (diffracted from different orders of
the echelle grating), without spectral overlap of these lines at the detector, as shown in Figure 3.4
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Baldwin, D. P.; Bajic, S. J.; Eckels, D. E. & Zamzow, D. S. Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility, report, April 12, 2002; Iowa. (https://digital.library.unt.edu/ark:/67531/metadc740987/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.