Measurement of acidic gas by Annular Denuder System (ADS) in Sha-Lu, Taiwan

• Published in: Toxicological and environmental chemistry Vol. 78; no. 1-2; pp. 93 - 103
• Main Authors: Fang, Guor-Cheng, Chang, Cheng-Nan, Lit, Shin-Chung, Wu, Yuh-Shen, Chen, Shun-Chin, Cheng, Chii-Dong
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.11.2000
• Subjects: Acidic gas; ADS
• ISSN: 0277-2248; 1029-0486
• DOI: 10.1080/02772240009358962

During June 1999 to January 2000, the concentrations of acidic gas were measured by ADS (annular denuder system) in central Taiwan, Taichung. The concentration of HNO 2 , HNO 3 , SO 2 , NH 3 and HCl were 2.81, 1.63, 24.69, 15.75 and 1.08 μg/m 3 , respectively. For the seasonal variations of acidic gases, the average SO 2 and NH 3 concentrations were higher in summer, and lower in winter. Contrarily, the HNO 2 and HNO 3 concentration were lower in summer, and higher in winter. Four meteorological factors: wind speed (m/s), wind direction, temperature (°C) and relative humidity (%) were taken into account in this study. Concentrations (μg/m 3 ) of SO 2 and NH 3 were moderate positive related to temperature (°C) with R 2 value of 0.668 and 0.678, respectively. The highest value of average SO 2 gas concentrations appeared in the SSW direction. It meant that the Taichung thermal power station which located in the west side of the sampling site were not the largest SO 2 contributor to the sampling area. The factories surrounded in the directions of southern-west and south could be the major SO 2 contributor for Sha-Lu area.