近年全球受極端氣候衝擊，淹水事件頻傳，且國外研究顯示，淹水房屋內之灰塵有較高濃度之鄰苯二甲酸酯類 (phthalate ester, PAEs)，國內數據亦發現最被普遍使用之PAE - 鄰苯二甲酸二乙基己基酯 (Di-(2ethylhexyl)phthalate, DEHP) 與潮濕及淹水等建築特性有關。然學界對於室內建築材料的受潮程度與PAEs逸散情形之瞭解甚少，因此本研究擬探討室內PVC裝修材料之含水量對其內PAEs逸散量之影響，PVC材料以市面常用塑膠壁紙為主，並選定DEHP為主要探討對象，實驗情境設定為模擬房屋淹水後15天內室內DEHP自壁紙內逸散情形之短期追蹤。
本研究測試市面上五款常用之壁紙，選用DEHP含量最高者 (2.16 mg/g, 0.22%)，固定面積置於2.4 L的玻璃製暴露艙內，裝載磁力攪拌器使空氣均勻分佈，並以人工加濕法穩定控制艙內空氣溫度和相對濕度。經考量前驅實驗之測試結果，本研究進一步選定理想之溫度與相對濕度（28°C、100%）參數條件，並依壁紙含水量分成三個系統：(A) 未添加壁紙（控制組），(B) 3%（乾燥壁紙未浸置水中)，(C) 50%（壁紙浸置水中30分鐘）；其中對B、C組進行重複試驗。其後每2天收集艙室內灰塵及空氣樣本，持續追蹤15天，最後一天採集艙內壁面之擦拭樣本，所有樣本皆以氣相層析質譜儀 (Gas chromatography-mass spectrophotometer, GC-MS) 分析DEHP的含量。
本實驗在三組系統內平均空氣與灰塵中DEHP濃度分別為0.34±0.27、0.80±1.01、1.01±1.30 μg/m3及0.14±0.13、0.46±0.48、0.75±0.62 μg/g。實驗結果證實，壁紙含水量愈大，測得之DEHP濃度也越愈高；雖空氣濃度甚低，但其隨著實驗天數增加而有上升的趨勢。整體來看，高含水量 (50%) 壁紙比低含水量 (3%) 者多出43%的逸散質量，且受潮第4天濃度開始上升，第6至15天將會出現高出136～238%之逸散量，顯示材料受潮後需在4天內移除之必要性，以減少室內人員DEHP濃度的暴露。此外，未來對於避免建築材料受潮或其防潮性之強化將有助於減低室內PAEs濃度之逸散，進而將低室內人員之健康風險。

This study aims to examine the effects of moisture content (MC) on the emission of PAEs level from the plastic building materials – the plastic wallpaper. DEHP is selected as the measured target for the emission profile. The plastic wallpaper with highest DEHP level (2,160.67 μg/g, 0.22%) was adopted in the current experiment. Three experimental conditions with different MC% levels of wallpapers are conducted: (A) without wallpaper (control chamber), (B) 3% (dry wallpaper) and (C) 50% (wallpaper soaked in water for 30 minutes). Air and dust samples were collected every second day over 15 days, and the wipe sample was collected in the last day. Higher DEHP concentrations emitted into the air and deposited on the dust are found with higher MC% of the wallpapers (Figure 1). An increasing trend of DEHP levels are associated with the length of the experiment can be found in the air sample (Table 1). Overall, about 43% higher of total DEHP mass released into air, dust and wipe samples was found in the damp wallpapers (MC = 50%) compared to that in the dry ones (MC = 3%). It is suggested that the material should be got rid of within 4 days once it has been damaged by water because of the emission of DEHP mass was found to be increased from the 4th day. It is the first study to evaluate the effects of material moisture on the emission of sVOCs in indoor environments.

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