Characteristics of Aerosols Collected near the Semiconductor Plants of a Science Park and in a Coastal Area

• Main Authors: Jen-Chieh Lin, 林人杰
• Other Authors: Shui-Jen Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/77753477705925866705

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 101 === In order to understand the characteristics of atmospheric aerosols in a semiconductor industrial park, we collected aerosol samples using Dichots at four sites (A, B, C, and D) in the Houli Park of Central Taiwan Science Park in spring (March 17−20) and summer (July 16−18) of 2012. The water-soluble ions of the collected coarse and fine particles were then analyzed. Additionally, aerosol samples were collected at the National Museum of Marine Biology and Aquarium, Kenting, Pingtung in February and April, 2013. The Dichot and PQ200 samplers were also used to collect atmospheric particles in the coastal area of southern Taiwan for their subsequent analysis of water-soluble ions in fine atmospheric aerosols (PM2.5). The results showed that during 2012 spring and summer in the semiconductor industrial park, the PM2.5 and PM2.5-10 were the highest at site C, followed by sites D and A, and the lowest at site B. Approximately 50−60% of PM10 in the park was contributed by fine particles. About half of PM2.5 and PM2.5-10 were water-soluble ions. ~90% of water-soluble ions were SO42-, NO3-, and NH4+. The most dominant water-soluble ion in PM2.5 was SO42-, while it was NO3- in PM2.5-10. The atmospheric PM2.5/ PM10 ratios in Pingtung costal area ranged 0.32-0.70 (average = 0.46±0.08). The atmospheric PM10 was mainly in the coarse size (PM2.5-10). Water-soluble ions accounted for about 46% and 40% of particle mass in the atmospheric PM2.5 and PM2.5-10, respectively. Among water-soluble ions, SO42- had the highest amount of mass, followed by NH4+ and Na＋ in PM2.5, while the order was Cl–＞NO3–＞Na＋ in PM2.5-10. Moreover, about 80% of PM2.5 ΣIons were secondary aerosols (SO42-、NO3-, and NH4+), and ~50% of PM2.5-10 ΣIons were sea salts (Cl–and Na＋). The sea salt compositions (Na＋and Cl–) and crustal elements (K＋、Mg2+ and Ca2+) of PM10 were chiefly in the coarse particles (~22% of PM2.5-10). About 35% of fine particles (PM2.5) were contributed by secondary aerosols (SO42-、NO3-, and NH4+).The atmospheric contents of secondary aerosols (SO42-+NO3-+NH4+) in the PM2.5 , PM2.5-10 , and ΣIons at the inland Houli Park of Central Taiwan Science Park were higher than those in the Pingtung costal area. However, the atmospheric contents of sea salts (Na+ and Cl-) and crustal elements (K+, Mg2+, and Ca2+) in the PM2.5 , PM2.5-10 , and ΣIons at the inland Houli Park of Central Taiwan Science Park were lower than those in the Pingtung costal area.