DETECTION LIMITS. Effective MDL values, estimated as three times the standard deviation of 29 field blanks, are 0.18 (nitrate), 0.94 (sulfate) , and 0.01 μg/m3 (ammonium). The MDL for sulfate is significantly influenced by one value and its removal reduced the sulfate MDL from 0.94 to 0.20 μg/m3, which is consistent with the MDL for nitrate. This revised MDL was used in subsequent data analysis. Ambient concentration values were not blank-corrected.
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