DETECTION LIMITS. Field blanks were periodically collected by briefly placing a filter in the sampling train in the absence of flow. EC and OC blank corrections were derived for each calendar year and applied to the respective ambient data. For the period 7/1/01 – 6/30/03 there were 76 field blanks with concentrations 0.14 ± 0.10 μg/m3 for TC, 0.10 ± 0.06 μg/m3 for OC, and 0.04 ± 0.05 μg/m3 for EC (assuming the setpoint flow rate of 12 LPM for 24 hours). Using three times the standard deviation as the MDL yields detection limits of 0.30 μg/m3 for TC, 0.18 μg/m3 for OC, and 0.15 μg/m3 for EC.
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Sources: Cooperative Agreement, Cooperative Agreement