Chemical Composition and Source Apportionment of Ambient Particulate

• Main Authors: Yao-Sheng Huang, 黃堯聖
• Other Authors: Chih-Yu Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/28566101063718108510

碩士 === 輔英科技大學 === 環境工程與科學系碩士班 === 94 === This research focused on the compositions of particulate matter and the acid-base gas(HNO3、HCl、HNO2、SO2 and NH3) in ambient at Daliao, Meinung and Tsoying. According to the literatures, the secondary aerosol contributes a great portion of particulate in the area. Secondary aerosols are mainly produced by the precursor gases after photochemical reaction or other physicochemical processes. Therefore, the investigation of precursor concentration and composition of particulate is necessary to understanding the relationship between the gas pollutants and particulate. Moreover, the study also uses the chemical mass balance model and back trajectory to measure the sources and pathway of pollutants. During the sampling periods, PM2.5 was contributed 59-71% of PM10 mass at Daliao, Meinung and Tsoying. The variation of PM10 concentration depended on the change of PM2.5. The water-soluble ionic species are the major components of both coarse and fine particulates which contribute 38-50% of mass portion. NO3-, SO42- and NH4+ are the main water-soluble ion of particulate. In addition, the carbon component and metallic elements are 27-41 and 3-19% of particulate mass, respectively. SO2 and NH3 are the major acid-base gases. The SO2 concentration at Daliao is higher than Tsoying. NH3 mainly emits from the agricultural activity; therefore, the higher NH3 is found in rural area (i.e. Meinung). The concentration of HNO3 is lower at nighttime, which resulted from the high OH free radical reaction in daytime. NH4NO3 is formation by the reaction of HNO3 and NH3 and it is a high conversion rate at Meingng. The major sources of coarse particulate are fugitive dust, traffic and photochemical reactions. The high traffic contributes at Tsoying, the local motor vehicles could be the reason. In addition, the sea salt is also found at Tsoying which is due to the station is near the coast. High vegetable burning and no industrial sources contributes in Meinung station, it can reflect the source of local area. Iron and steel industry, cement industry, oil burning are the major industrial sources of particulate. For fine particulate, the photochemical reaction and traffic emission are the main sources at three stations. According to the back trajectory model, high pollution air mass comes from the northern area that indicates the transport effect in the air basin.