Development of a Piezoelectric Crystal Sorption Detector for Monitoring of Total Organic Compounds in Air
| Autor: | Y. Y. Wong, Y. S. Fung |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Moisture
Chemistry Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Analytical chemistry Soil Science Sorption medicine.disease Pollution Toluene Analytical Chemistry Volumetric flow rate chemistry.chemical_compound Room air distribution medicine Environmental Chemistry Relative humidity Benzene Waste Management and Disposal Vapours Water Science and Technology |
| Zdroj: | International Journal of Environmental Analytical Chemistry. 78:397-412 |
| ISSN: | 1029-0397 0306-7319 |
| DOI: | 10.1080/03067310008041356 |
| Popis: | A light and portable organic vapours monitor has been developed using piezoelectric (P/Z) quartz crystal to determine Volatile Organic Compounds (VOCs) commonly found in workplace air. Out of the eight coating material studied, High Vacuum Grease (HVG) was found to be the best for determining commonly encountered organic vapours such as 1,1,1-Trichloroethane, Chloroform, Benzene and Toluene in room air. The optimised coating weight was 23 μg HVG at a flow rate of 200 mL/min. Moisture was found to interfere and the use of a Nafion gas dryer was found to reduce the relative humidity to a constant 37 % for room air with 43–81 % relative humidity. Under optimised conditions, a mean sensitivity of 1.9 × 1−2 Hz/ppm was obtained for total VOCs with 17.2% RSD variation towards different VOCs. Excellent linear working ranges were obtained from 40 to 2400 ppm (v/v), with response time and recovery time within one minute up to 500 ppm (v/v) of analyte. High and relatively constant response factors were obta... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|