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Project Status: complete

Title: Surface and upper air VOC sampling and analysis during the 1997 Southern California oxidant study.

Principal Investigator / Author(s): Fitz, Dennis

Contractor: UC Riverside

Contract Number: 96-322

Research Program Area: Atmospheric Processes

Topic Areas: Field Studies, Monitoring


SCOS97-NARSTO was a multi-agency, $7 million study to collect data for regional air quality models used to design ozone attainment strategies and to resolve intra-regional air pollution transport issues. The study assembled a comprehensive network of instruments to measure both ground-level and upper-air meteorological and air quality data. This report describes the results of measuring volatile organic compounds (VOCs) during the intensive operating periods (IOPs) of SCOS97-NARSTO. These measurements are part of the overall VOC measurement campaign performed in support of the study. The results discussed in this report will be added to the other data collected during the study to provide a comprehensive database for modeling and data analysis. The collection effort was coordinated by Mr. Dennis Fitz, while the analyses were performed under the direction of Dr. Rei Rasmussen and Dr. Kochy Fung. Carbonyl samples were collected using sorbent cartridges coated with dinitrophenylhydrazine while SUMMA ģ polished stainless steel canisters were used to collect samples for other VOC analyses. Carbonyl concentrations were determined by analyzing the extracts from the cartridges by high-performance liquid chromatography (HPLC). VOC concentrations were measured by gas chromatography (GC). Samples were collected from two aircraft platforms (UC Davis and STI) and three ground-based sites (Azusa, Los Angeles Civic Center at the Department of Water and Power, and Los Angeles downtown at the top of the ARCO Tower). Samples at the ground sites were collected for three-hour periods, four times a day, for each of the thirteen IOP days, resulting in the collection of 156 samples. The aircraft operated on different and varying schedules, although generally during IOP days. They collected 155 samples. Overall data capture was over 95%. In addition, blanks, collocated samples, and audit samples were collected and analyzed. Analysis data from the laboratory were combined with those from field sampling to compile the results in concentration units. The data were then validated. Examples of the data are shown by reporting formaldehyde and total non-methane hydrocarbon concentrations for each sample. The full data set has been submitted to the ARB in electronic format.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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