Measuring ambient carbonyls using DNPH-coated substrates: Comparison of C18 and silica gel with and without ozone scrubbers
- DGA, Inc., Ventura, CA (United States)
Carbonyls in ambient air play a critical role in atmospheric chemistry, including ozone formation on urban and regional scales. Recently mandated requirements to report ambient levels of formaldehyde and other carbonyls as part of the nationwide PAMS monitoring program underline the importance of obtaining reliable, interference-free data when measuring ppb levels of carbonyls in urban air. The DNPH-liquid chromatography method, initially described by Kuwata et al. in Japan and by Grosjean and Fung in the US, has since been endorsed by ASTM, EPA and other agencies; this method has been suggested by EPA as the method of choice for PAMS monitoring of ambient levels of carbonyls measured using co-located C18 and silica gel substrates with and without scrubbers to remove ambient ozone. As part of this study, the performance of several types of ozone scrubbers has been evaluated. The results will be discussed with special emphasis on PAMS requirements for monitoring of ambient carbonyls by state and local air pollution control agencies.
- OSTI ID:
- 197349
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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