||Comparison of Measurement of Ambient Particulate Nitrate with Semi-Continuous Instruments.
Long, R. W. ;
McClenny, W. A. ;
||Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab.
Measuring instruments ;
Air pollution sampling ;
Collecting methods ;
Ambient levels ;
Ion chromatography ;
Flash vaporization ;
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Comparisons between two different semi-continuous monitors of ambient level particulate nitrate are interpreted for both field and laboratory studies. One instrument involves flash vaporization of impacted particulate nitrate to form a combination of NO and NO2 gases which are detected as NO in a chemiluminescence's monitor. The second instrument involves the collection of particulate nitrate in a mist chamber with subsequent analysis of nitrate ions by ion chromatography (IC). Ambient measurements in Rubidoux, CA during July 2003 as well as measurements in the EPA research laboratories at Research Triangle Park, NC suggest the occurrence of decreased instrumental response related to particle bound water (or other matrix) content for the monitor using flash vaporization. Both Ambient and laboratory experimental results are interpreted.