石化工業區揮發性有機物及臭味污染問題為附近居民所關注，本研究針對石化工業區臭味特徵成份做研究，特徵成份的選擇以相關研究檢測資料、石化工業區原物料清單及臭味物種閾值等，找出本研究石化工業區之致臭成份進行現場採樣分析，以探討石化工業區臭味特徵成份及污染特性。
本研究於石化工業區周界人口較密集之兩處測點，進行現場採樣分析，兩測點各進行二次連續48小時採樣，分析揮發性有機物成份包括：苯、甲苯、乙苯、間,對-二甲苯及鄰-二甲苯、苯乙烯、丙烯腈、1,3-丁二烯，以及酯類：甲基丙烯酸甲酯，氨、硫化氫等十一種臭味特徵成份（其中VOCs使用GC/MS分析、硫化氫使用GC/PFPD分析、氨使用自動連續監測儀分析），並且配合採樣時間及風向速來解析。
研究結果顯示，甲測點位於工業區北方，風向來源多為石化工業區上風來源及鄰近交通源，測得物種多為苯、甲苯、乙苯、間,對-二甲苯，乙測點位於工業區東方，風向來源多為石化工業區及交通源，測得物種多以工業源物種為主，氨、丙烯腈、1,3-丁二烯、苯乙烯、MMA為主，濃度範圍依序介於：2.2~111 ppb、0.3~42.6 ppb、0.4~14.9 ppb、1.5~6.2 ppb、0.5~0.6 ppb。甲測點BTEX濃度多於乙測點(1.2~1.7倍)，且兩測點BTEX比值均接近交通源BTEX比值，顯示石化工業區周界特徵成份苯、甲苯、乙苯、二甲苯受上風側移動源影響十分顯注。氨、丙烯腈、1,3-丁二烯、苯乙烯、MMA此五成分於甲測點濃度特徵比值以MMA為1，依序為14.6：1.2：1.2：6.6：1，乙測點依序為75.3：10.7：7.1：5.3：1，表示乙測點應受工業源影響較大。
本研究發現甲測點氨及硫化氫濃度時間出現相似，潛在上風來源有待進一步追蹤。乙測點日間測得：丙烯腈、1,3-丁二烯、苯乙烯、MMA，於11:00~19:00濃度有同時出現現象，依風向來源判斷可能為石化工業區內廠家所為。此外，乙測點之氨及甲苯濃度出現時間相似情形，可能與區內某二廠家同時運用氨及甲苯之工廠排放有關。乙測點日間風向來源多為西風主要來自石化工業區，夜間風向偏移為西北風及東南風，工業源物種日間濃度約是夜間濃度1.1~12.4倍(日：AM 6:00~PM 6:00；夜：PM 6:00~ AM 6:00)。
臭味強度評析石化工業區周界各物種臭味干擾顯示，氨及甲苯為較常出現較高濃度之物種；氨之臭味閾值較低(43 ppb)，故為石化工業區主要致臭特徵成份。其他多種工業源物種雖然閾值甚低，唯其偵測濃度逹限值之次數較少，屬於短時間或瞬間致臭成份，依臭味強度排序為苯乙烯＞MMA＞1,3-丁二烯＞丙烯腈。總臭味強度與總濃度相關性迴歸，於乙測點分別為0.8及0.7，相關性較甲測點好，顯示在乙測點有偵測到特徵致臭成份之濃度值。
以連續自動監測法與壓縮容器法分析VOCs特徵成份，兩者濃度相關係數R2介於0.62~0.96之間，且濃度差異不大。前者為現場採樣後立即分析，低濃度出現率較壓縮容器法高，且在時效性上具有優勢，壓縮容器法採集樣品時間較長，濃度代表性具有優勢。

The air pollution due to the volatile organic compounds (VOCs) and the odorous problems in the petrochemical park were concerned by its neighborhood. The characterization of the odorous components, chosen from the consideration of the reference papers, the raw material list of the factories in the Da-She petrochemical industry park and the thresholds value of odorous compounds, was conducted in this study.
Twice of continuous 48 hours air sampling with the interval of two hours per time using the Canister followed the Method To-14, in the populated and sensitive sites of S1 upwind and S2 downwind around the Da-She industry park, was conducted in this study to measure 11 components (using GC/PFPD for hydrogen sulfide, GC/MS for VOCs and ammonium analyzer) including benzene, toluene, ethylbenzene, xylene, styrene, arcrylonitrile, 1,3-butidiene, MMA, ammonium and hydrogen sulfide, and the resolution of the investigation results accompanying with the variation of time and wind direction and velocity.
The major odorous components measured in the S1 site, located at the upwind of the industry park but downwind of the Jern-Shen freeway, included benzene (B), toluene (T), ethylbenzene (E), and m,p-xylene (X). Both of the average ratio of BTEX of 1:2.8:0.8:0.9 in the S1 site being 1.2 ~ 1.7 time of 1:3.4:0.6:0.5 in the site S2 were close to the ratio of 1:2.4:0.5:1.9 from the vehicle emission, which showed that the S1 and S2 sites were apparently effected by the freeway emission. However, in the S2 site the concentration range of the petrochemical components ammonium, acrylonitrile, 1,3-butidiene, styrene and MMA releasing from the factory were 2.2 ~111 ppb, 0.3 ~ 42.6 ppb, 0.4 ~ 14.9 ppb, 1.5 ~ 6.2 ppb and 0.5 ~ 0.6 ppb respectively that corresponded to the ratio of 75.3:10.7:7.1:5.3:1, which being larger than that of 14.6:1.2:1.2:6.6:1 in site S2 showed that the effect due to the petrochemical factories emission was significant in site S2.
The components of ammonium and hydrogen sulfide, measured in site S1 always existing in the same time and not belong to the vehicle emission, indicated that the further investigation of its potential source was needed. On the other aspect, these compounds including acrylonitrile, 1,3-butidiene, styrene and MMA measured in the S2 site appearing at the same duration of a.m. 11:00 ~ p.m.7:00 indicated that was caused from the emission of the factories in the industry park., while the similar occasion of the ammonium and toluene observed simultaneously was correlated to the emission from two factories . The major wind source of the S2 in the daytime (a.m. 6:00 ~ p.m. 6:00) being the western direction, and the western north and eastern south direction in the nighttime (p.m. 6:00 ~ a.m. 6:00) came from the industry park, which resulted in the 1.1 ~ 12.4 time of industry contents in the daytime larger than that in the nighttime.
The odor strength, defined as the ratio of measured concentration to the thresholds concentration, of the ammonium and toluene appearing often with higher concentration were the major odorous components in the petrochemical park, while some components come from industrial emission was measured seldom with lower concentration and odor strength in the order of styrene, MMA, 1,3-butidiene and acrylonitrile. The square of the correlation coefficient between the total concentration and the total odor strength of all odorous components measured twice in the S2 sits of 0.8 and 0.7 were significant for the identification of the odorous components.
The comparisons of measuring the VOCs between the continuous monitoring system in site and the method TO-14 sampling by canister obtained the square of the correlation coefficient of 0.62 ~ 0.96, owing to the lower instant concentration existing in the VOCs monitoring system in site and the higher concentration obtaining in the canister sampling method spending more time.

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