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題 名 | In-situ Gas Chromatographic Time-series Measurements of Toxic Halocarbons CIHC=CCl₂ (Trichloroethene) and Cl₂C=CCl₂ (Tetrachloroethene) in the Urban Atmosphere of Lukang=鹿港市區大氣中毒性鹵碳化合物三氯乙烯(CIHC=CCl₂)與四氯乙烯(Cl₂C=CCl₂)現場氣相層析時間序列量測 |
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作 者 | 李丙生; 邱創標; | 書刊名 | 中州學報 |
卷 期 | 25 2007.06[民96.06] |
頁 次 | 頁199-212 |
分類號 | 445.63 |
關鍵詞 | 大氣; 毒性鹵碳化合物; 三氯乙烯; 四氯乙烯; 氣相層析; 時間序列; Time-series; Land-sea breezes; Diurnal cycle; |
語 文 | 英文(English) |
中文摘要 | 鹿港市區大氣中毒性鹵碳化合物三氯乙烯與四氯乙烯與其它鹵碳化合物 CFC-11,CFC-12,CFC-113,CH3CCl3及 CCl4 於2006年1月10月進行時間序列量測。本區四氯乙烯在觀測期間不常出現高濃度值;然而三氯乙烯在本區經常出現高濃度值。本區所有鹵碳化合物的時間序列量測結果,顯示各化合物的排放強度約成下列由大而小排列:ClHC=CCl2> CFC-12> CFC-11> CH3CCl3> Cl2C=CCl2 > CC4> CFC-113。大氣中三氯乙烯與四氯乙烯的濃度變化,主要受日夜海陸風及人為排放所控制。三氯乙烯時與四氯乙烯的高濃度值通常出現在空氣滯留不動時期及陸風所主控時期。三氯乙烯的濃度時間序列分佈變化與CFC-11,CFC-12 及CH3CCl3類似,皆呈現日夜循環狀態,高濃度值通常出現在夜間而低濃度值通常出現在日間。然而,濃度日夜循環狀態對四氯乙烯而言較不明顯。 |
英文摘要 | Time-series observations of the atmospheric toxic halocarbons, CIHC=CCl2 (trichloroethene) and Cl2C=CCl2 (tetrachloroethene), along with CFC-11, CFC-12, CFC-113, CH3CCl3 and CCl4 were conducted at a site in Lukang between January and October 2006. Elevated levels of Cl2C=CCl2 occurred sporadically and its low level was undetectable for most of the observed period; by contrast, elevated levels of CIHC=CCl2 frequently occurred. All of measured species of halocarbons are ranked in decreasing order of emission strength: ClHC=CCl2 > CFC-12 > CFC-11 > CH3CCl3 > Cl2C=CCl2 > CCl4> CFC-I13. Fluctuations in the atmospheric concentrations of CIHC=CCl2 and Cl2C=CCl2 were generally driven by diurnal land-sea breeze and anthropogenic activity in this area. Elevated levels of CIHC=CCl2 and Cl2C=CCl2 usually occurred when the air was stagnant and when the prevailing seaward land breeze was dominant. The time-series distribution of atmospheric levels of CIHC=CCl2 was characterized by a diurnal cycle like CFC-11, CFC-12 and CH3CCl2 with an elevated level at night and a low level during the daytime for most of the observed periods. However, the feature of diurnal cycle was poorly identified for Cl2C=CCl2. |
本系統中英文摘要資訊取自各篇刊載內容。