A Study of chemical characteristics of particulate matters in the Yun-Chia-Tou regions, Taiwan

• Main Authors: Yi-Ming Chen, 陳毅明
• Other Authors: Meng-Chen Chung
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/75523648925786420257

碩士 === 環球技術學院 === 環境資源管理所 === 97 === In this study, suspended particulates sampling was preceded during the period of January to November, 2008. Four sampling sites were at Taixi, Zhushan, Xingang, and Puzi. After sampling, filter samples were analyzed by ion chromatography for water-soluble anions, F-, Cl-, NO2-, NO3-, SO42-, and cations NH4+, Na+, K+, Mg2+, Ca2+. The result showed that wind speed had much influence on the particulate level at the coastal site Taixi, especially during the poor diffusion period. At the inland site Zhushan, the ratio of anions to cations (A/C) revealed almost unity. The aerosol characteristics showed that there were acidic aerosol presented at the Taixi and Zhushan area. While, at the Xingang and Puzi, there were sufficient ammonium ions which could neutralize acidic aerosols. During the period of March to April, 2008, high levels of PM10 and PM2.5 mainly caused by poor diffusion were measured. During the events, the secondary aerosol, NH4+, NO3-, SO42-, showed an increase of 1.5 to 3.2 times. The marine aerosol Na+, Cl-, and dust material Mg2+,Ca2+, were detected the most at the Taixi, and the least at the Zhushan among the four stations. During the sandstorm events in March, 2008, the obvious growth of F- and Ca2+ levels were measured, and it showed the most at Taixi, i.e., the increase of 15.6 and 6.5 times, individually. By the backward trajectory analysis, the dust started from the Northeast of mainland China, and moved to the southeast by the high-pressure system. It carried some artificial pollutants from the industrial area while crossing through the Yangtze River. During the events of agricultural waste burning, the secondary harvest in 2008, the K+ and Cl- in PM2.5 were the major increased species at Xingang and Puzi. It presented the most ozone events at the Zhushan station among the four. A total of seven ozone events during the sampling period were detected. PM10 and secondary aerosol revealed low correlation with O3, 8hr and O3, max at Taixi, and median to low correlation at the other three sampling sites. By the pollutant wind rose diagram during the high level events, the wind direction mainly indicated the west and the southwest at the Zhushan area. The analysis showed the northeast, the northwest, and the southwest for the Taixi area and it revealed the significant influence by the emission from the Industrial Park. At the site of Xingang, most high particulate levels were presented with the northwest wind coming from the industrial area. It seemed that the air quality of Xingang and the industrial area might also have an influence on the Puzi.