台灣中部地區大氣有機碳及元素碳微粒之特性研究

• Main Author: 藍文農
• Other Authors: 鄭曼婷
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/61749978179443325700

碩士 === 國立中興大學 === 環境工程學系 === 90 === Elemental carbon (EC) and organic carbon (OC) particulates were analyzed using thermal method in this study. The optimum condition of separating the elemental and the organic carbon was found by heating the particulate samples with pure oxygen of flow rate 0.5 lpm at the temperature 340 ℃ for 80 minutes. The results showed that the EC concentrations measured previonsly under the condition in on open at air 340 ℃ for 10 minutes was about 0.38 times lower than those measured with optimum condition characteristics of EC and OC particulates measured in central Taiwan during the period from October 1999 to October 2001 were analyzed and secondary OC concentrations were also estimated in this study. The results revealed the total carbon (TC) and the OC concentrations in PM10 were significantly increased during PM10 episodes in autumn. TC and OC concentrations were found higher at inland site as compared more uniformly distribated in the region. However EC particulates were found with those at coastal sites. The minimum OC/EC ratios of 1.80 and 1.94 were oftained for PM2.5 and PM10, respectively. Those ratios were then used to estimate the concentrations of the secondary OC. The resultes showed secondary OC concentrations in PM10 ranged from 2.6 to 14.7 μg m-3 which contributed 31 to 19 % of OC. Further more the summer and the autumn aerosols observed in this study contained more secondary OC than the other seasons. A good correlation between the secondary OC and the ozone were found in the case of the autumn aerosols.