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The overall approach to determining the actual ariability of CMMs at mercury concentrations <1.0 µg/Nm3 was to compare the CMM results to those obtained based on a reference method (EPA Method 30B). To do this, three primary tasks were completed. The first task was the initial preparation of the equipment, including the particulate test combustor (PTC), the spiking systems, the CMMs, and the OhioLumex.
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