A Study of Ambient Ionic Species Using Diffusion Denuder,

• Main Authors: Perng Shuang Neng, 彭雙能
• Other Authors: Tsai Chuen Jinn
• Format: Others
• Language: en_US
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/79475799629521654228

碩士 === 國立交通大學 === 環境工程研究所 === 83 === The sampling artifacts are formed due to the retention and absorption of gases by sampling media and collected particles, volatilization of collected particles, gas-particle and particle-particle reactions within collected particles. Two Annular Denuder Systems (ADS10 and ADS2.5) were used to quantify sampling artifacts of soluble ionic species determined by the high volume PM10 (Hi-vol PM10) and PM10 dichotomous (Dichot10 and Dichot2.5) samplers. Artifact formation during 24-conditioning of filter samples was important and was also investigated. In addition, characteristics of acidic aerosols in Hsin Chu air monitoring station was also studied. Experimental results show that the PM10 dichotomous sampler with Teflon filters collects 8 % more sulfate, because of adsorption and oxidation of SO2 by the particle deposits, but less nitrate (by 21 %), chloride (by 32 %) and ammonium (by 21 %) than the ADS10 because of volatilization and reactions. While the PM10 dichotomous sampler with Teflon filters collects nearly the same amount of sulfate as the Hi-vol PM10 sampler with quartz filters, it collects much less nitrate (by 8 %), chloride (by 8 %) and ammonium (by 3 %) than the latter because of more volatilization and reactions in its fine fraction.