An automated monitoring system for various C1 to C5 gas-phase organic carbonyls in ambient air is described. The system consists of a parallel plate diffusion scrubber (PPDS), which is coupled with a high-performance liquid chromatography-ultraviolet (HPLC-UV) system using an automated injection valve. Compared with an annular diffusion scrubber (DS) employed so far for gas-phase carbonyl monitoring, PPDS shows an improved collection efficiency for formaldehyde, acetaldehyde, propionaldehyde, and acetone with >97% at an airflow rate of 0.5 L/min. High gas-liquid concentration ratios of PPDS and an optimised HPLC-UV system allow limits of detection (LOD) in a range of 80-500 pptv. A low liquid hold-up volume of the PPDS results in a short response time of about 10 min. Additionally, the optimised analysis time for 13 carbonyl compounds containing calibration standard enables brief measurement intervals of 25 min. The developed PPDS-HPLC system shows its reliability from urban site monitoring in Seoul, South Korea.
|Number of pages||11|
|Journal||International Journal of Environmental Analytical Chemistry|
|Publication status||Published - 2004 Apr 15|
Bibliographical noteFunding Information:
This work was financially supported by the Ministry of the Environment of Korea, for which the authors are grateful.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Environmental Chemistry
- Water Science and Technology
- Waste Management and Disposal
- Soil Science
- Public Health, Environmental and Occupational Health
- Health, Toxicology and Mutagenesis