Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Evaluation and Use of Stand-Alone Commercial Photolytic Converters for NO2 to No Conversion

spacer
spacer
Abstract: Two types of stand-alone commercial photolytic converters of NO2 to NO are now available for use with NO, O3 chemiluminescence monitors for the measurement of NO2. Both units have been tested for interferences resulting from photolysis of HONO or from decomposition of PAN. One unit is based on the use of a broadband source and incorporates a source cooler. This unit has been used for two month-long field studies, one in May of 2002 and a second in October 2003. The results indicate that the converter is robust and reliable with conversion efficiencies of of 35 to 70% depending on the air flow rate through the converter. The second commercial unit is based on a LED array with output emission wavelength at 390 to 400 nm. This unit is being field tested for use as part of on-going tests. Based on results so far the prospect of using one of the stand-along converters with an external, heated metal converter and a chemiluminescence monitor to measure NO, NO2, and NOy seems reasonable.

Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy.
spacer
Citation:Kronmiller, K. G., and W. A. Mcclenny. Evaluation and Use of Stand-Alone Commercial Photolytic Converters for NO2 to No Conversion. Presented at Symposium on Air Quality Measurement Methods and Technology, Research Triangle Park, NC, April 20-22, 2004.
spacer
spacer
Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
spacer
Division: Human Exposure & Atmospheric Sciences Division
spacer
Branch: Process Modeling Research Branch
spacer
Product Type: Abstrct/Oral
spacer
Presented: 04/20/2004
spacer
Related Entries:
spacer
Bullet Item Field Evaluation of New NOx/O3 Precursor Methods
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov