Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/45545
標題: Distribution of PM2.5 and gaseous species in central Taiwan during two Chinese festival periods
作者: Horng, C.L.
鄭曼婷
Cheng, M.T.
Chiang, W.F.
關鍵字: PM2.5
sulfate
nitrate
nitric acid
pollution roses
aerosol
urban
pollution
acidity
hcl
期刊/報告no:: Environmental Engineering Science, Volume 24, Issue 4, Page(s) 515-524.
摘要: Measurements of PM2.5 and acidic gases were conducted at an inland site of Taichung basin. The sampling site was Nantou, which is located at a distance of 25 km from the Taichung city. Nantou represents an inland area surrounded by Central Mountain Ranges and Baqua Hill. The sampling timings were in the month of April (during Tomb-Sweeping Festival) and in September (during Mid-Autumn Festival). PM2.5 samples were collected with an annular denuder system. Aerosol ionic species including sulfate (SO42- ), nitrate (NO3-), ammonium (NH4+), chloride (Cl-), calcium (Ca2+ ), potassium (K+), and sodium (Na+) and gaseous nitric acid (HNO3), hydrochloric (HCl), and sulfur dioxide (SO2) were analyzed. Results showed that the average PM2.5 concentration were 41.3 mu g m(-3) during the Tomb-Sweeping Festival period and 65.3 mu g m(-3) during the Mid-Autumn Festival period. The major particle-phase ionic species was sulfate (SO42-) during both the Chinese Festival periods. Ozone concentration was higher during the Mid-Autumn Festival. Sulfate (SO42-) and nitrate (NO3-) concentrations were well correlated with daily maximum ozone (O-3)concentration. The time weight mean concentration data showed that the increased concentration of gas-phase sulfur dioxide (SO2) and sulfate (SO42-) were transported from Taichung City, which is located close to the sampling site. Based on our above obtained results, the Mid-Autumn Festival period showed more anthropogenic impact on the aerosol and gaseous distribution favored by meteorological factors, higher ambient temperature, and wind direction.
URI: http://hdl.handle.net/11455/45545
ISSN: 1092-8758
文章連結: http://dx.doi.org/10.1089/ees.2006.0103
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