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COMPARISON OF MEASUREMENTS OF AMBIENT PARTICLE NITRATE WITH SEMI-CONTINUOUS INSTRUMENTS
Citation:
Long, R. W. AND W A. McClenny. COMPARISON OF MEASUREMENTS OF AMBIENT PARTICLE NITRATE WITH SEMI-CONTINUOUS INSTRUMENTS. Presented at Symposium on Air Quality Measurement Methods and Technology, Research Triangle Park, NC, April 20-22, 2004.
Impact/Purpose:
1. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of ozone, ozone precursors, and reaction products of ozone formation.
2. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of water-soluble PM components and water-soluble atmospheric gases.
Description:
Comparisons between two different semi-continuous monitors of ambient level particulate nitrate are interpreted for both field and laboratory studies. One instrument involves thermal desorption of particulate nitrate to form a combination of NO and NO2 gases which are detected as NO in a chemiluminescence monitor. The second instrument involves the collection of particulate nitrate in a mist chamber with subsequent analysis of nitrate ions by ion chromatography. Ambient measurements in Rubidoux, CA during July, 2003 as well as measurements in the research laboratories at the Research Triangle Park, NC indicate the occurrence of response saturation related to particulate water content. These experimental results are interpreted.
Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy.