燒香祭拜祖先與敬奉神明一直是國人重要習俗之一，但目前已知拜香燃煙中含有多環芳香化合物PAHs，相關研究指出國人鼻咽癌之得患率較高，燒香可能為致病因子之一。故本研究擬主動改善拜香成分，選取國人常用之四種拜香，於實驗箱內燃燒之方式，選用金屬鹽類與抗氧化酵素添加於拜香香支中，分別比較在燃燒情況下所產生的空氣污染物之特性。以GC/MS分析燃燒拜香所排放的PAHs，以ICP-AES分析拜香添加藥劑後之重金屬含量。
結果顯示添加金屬鹽類使拜香燃燒速率增快、懸浮微粒排放係數減少、香灰排放係數增加，燃燒所產生的S-PAHs高於原始拜香，其特徵主要都是5環以上的PAHs為主；其中又以BaP、IND、BghiP為主要(62.8~71.4 %)。此外添加抗氧化酵素之拜香與原始拜香之燃燒速率，懸浮微粒、灰排放係數無顯著影響，但所產生的S-PAHs低於原始拜香，其特徵亦主要以5環以上的PAHs為主；其中又以BaP、IND、BghiP為主要(68.4~71.3 %)。
本研究顯示添加的金屬含量確實對於燃燒拜香所排放的懸浮微粒有相當程度的改善；添加抗氧化酵素可以降低S-PAHs之排放量。可是添加此兩種添加劑在毒性潛在因子的評估皆高於原始拜香，對於此結果值得後續深入探討。

Worshiping ancestors and gods by burning incense sticks is one of the important traditions for the Chinese. It has been reported that PAHs and other toxic pollutants are found in incense smoke. This research studied the effect of additives on incense emissions.
Four types of incense sticks representing different ingredients were chosen for this study. Metallic salts and an anti-oxidant enzyme were added to several types of incense, which were burned in a custom-designed combustion chambers. Combustion products from incenses were collected and subsequently analyzed by a GC/MS for PAHs, and by an ICP-AES for metals in the emission.
The results showed that adding the metallic salts increased the burning rate and the emission factor of ash of the incense. At the same time, the emission factor of particulate was decreased. The emission factor of S-PAHs was higher than the original unmodified incenses. The distribution profiles for PAHs were all similar among incences. Five- or higher rings were major PAHs. Especially, BaP, IND, BghiP were the most abundant (62.8~71.4 %).
Addition of the anti-oxidant enzyme had no obvious influence on the burning rate, emission factor of ash and emission factor of particulate. The emission factor of S-PAHs was lower than unmodified incense. The distribution profiles for PAHs were all similar among incences. Again, the 5- or higher rings PAHs were major compounds. Especially, BaP, IND, BghiP had the highest contributions (68.4~71.3 %).
This research shows that, while adding the metal content supresses the emission factor of particulate, and the anti-oxidant enzyme reduces the emission factor of S-PAHs, the emitted products become potentially more toxic. Further investigation in this aspect is therefore recommended.

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