| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 94 === 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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