台灣郊區秋季PM10、PM2.5、PM1.0及氣狀污染物之化學特徵日夜變化

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標題:	台灣郊區秋季PM10、PM2.5、PM1.0及氣狀污染物之化學特徵日夜變化 Diurnal Variation of Chemical Characteristics of PM10, PM2.5, PM1.0 and Gaseous Pollutants in the Urban of Taiwan in autumn The characteristics of particulate matter (PM) and gaseous pollutants differ depending on the human activities and natural emissions that occurred during that time. In this study, we characterized the chemical species of PM10, PM2.5, PM1.0, and gaseous pollutants, and explore the relationships between chemical species of PM and gaseous pollutants during daytime and nighttime in the autumn 2018. The samples were collected in the suburban of Tainan City, southern Taiwan, during the daytime (8.00-17.00) and nighttime (17.00-8.00). The chemical characteristics of PM including organic matter (water-soluble ions, carboxylates, and saccharides) and gaseous pollutants were investigated.The concentration of gaseous pollutants NH3 was the highest among all gaseous pollutants followed by HCl, SO2 and HNO3.The concentrations of HCl and SO2 were higher in the daytime due to industrial activities in the daytime. Meanwhile, HNO2 was higher in the nighttime compared with HNO3 was higher in the daytime due to the photochemical reaction that HNO2 transformed to HNO3 in the daytime. On the other hand, the average NH3 concentration in the daytime was 19.9% lower than that of night NH3 due to cooling of the earth’s surface in the nighttime and the turbulence is reduced so reduce of vertical mixing. The average concentration of gaseous oxalic acid was higher during the day. The gaseous oxalic acid in the daytime was always higher than that in the nighttime, apparently indicating there is more oxalic acid produced during the day. Oxalate was the most abundant dicarboxylate species in all particle size and three periods followed by pyruvate, oxalate and pyruvate in PM10, PM2.5, and PM1.0 were higher in the daytime due to photochemical reaction. The ratio of acetate/formate (A/F) in PM10, PM2.5, and PM1.0 were higher than 1 indicates that organic compounds were originated from primary sources. The malonate and succinate ratio (M/S) in PM10, PM2.5, and PM1.0IIranged from 1.75 to 2.21 indicated that organic compound sources are contributed with traffic emission and photochemical reaction. Moreover, SO42- was the dominant ionic species in PM10, PM2.5, and PM1.0 and among three periods followed by NO3- and NH4+. Most of the ionic species were higher in the daytime due to human activities such as transportation, agriculture, and industries. The ratio of oxalate/nss-sulfate was high ranged from 5.24 to 6.24% indicates that both species are the final products of the photochemical reaction. In addition, levoglucosan was the highest saccharide species in PM10, PM2.5, and PM1.0 followed by trehalose and glucose, almost saccharide species were higher in the daytime during three periods suggested that biomass burning and biogenic activities were a major source of saccharide species and barbecue burning in the nighttime during MAF not have much more impact.
作者:	Somphan, Sasipim
貢獻者:	環境工程與科學系蔡瀛逸
關鍵字:	氣狀物污染化學特徵日夜變化中秋節粒狀物 Gaseous pollutants Chemical characteristics Diurnal variation Mid-Autumn Festival Particulate matter
日期:	2020
上傳時間:	2022-10-21 10:33:22 (UTC+8)
關聯:	電子全文公開日期：2023-12-31 學年度：108， 149頁
顯示於類別:	[環境工程與科學系(所)] 博碩士論文

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