多環芳香族碳氫化合物於加熱過程中之安定性   全文下載

Stability of Polycyclic Aromatic Hydrocarbons during Heating

本研究以模式系統探討benzo（a）pyrene （BaP）, benzo（a）anthracene （BaA） 和dibenzo（a,h）anthracene （DBahA）三種多環芳香族碳氫化合物（PAH）以固態或溶液形態於加熱過程中之安定性，並以高效率液相層析法（HPLC）測定殘留PAH之含量。結果顯示，PAH的熱裂解速率與加熱溫度及存在形態有直接相關。密閉狀況下，固態PAH含量或PAH 溶液的濃度均隨著加熱溫度及時間增加而減少，三種PAH於200°C之熱裂解速率均遠大於100°C，且其熱裂解均符合一次反應。在相同加熱溫度下，固態的PAH較PAH溶液安定。100°C加熱時，BaA具有最大的裂解速率數，其次為BaP 和DBahA； 200°C加熱所得到的結果與100°C類似，但BaA的安定性郤較BaP大。"

The stability of three polycyclic aromatic hydrocarbon (PAH) standards, benzo[a]pyrene (BaP), benzo[a]anthracene (BaA) and dibenz[a,h]anthracene (DBahA) during heating was studied. The residual amount of each PAH was quantified by high-performance liquid chromatography (HPLC). Results showed that during heating in a closed system, the levels of BaA, BaP and DBahA in solid form or in hexane decreased both with increasing temperature and time. The degradation of each PAH during heating fits a first-order model, and the degradation rate constant (hr-1) at 200°C was higher than at 100°C. Also, the PAHs in solid form possessed higher stability than in hexane. Either in solid form or in solution, BaA showed the highest degradation rate constant, followed by BaP and DBahA at 100°C. Similar result was found at 200°C, with the exception that BaA was more stable than BaP. 本研究以模式系統探討benzo（a）pyrene （BaP）, benzo（a）anthracene （BaA） 和dibenzo（a,h）anthracene （DBahA）三種多環芳香族碳氫化合物（PAH）以固態或溶液形態於加熱過程中之安定性，並以高效率液相層析法（HPLC）測定殘留PAH之含量。結果顯示，PAH的熱裂解速率與加熱溫度及存在形態有直接相關。密閉狀況下，固態PAH含量或PAH 溶液的濃度均隨著加熱溫度及時間增加而減少，三種PAH於200°C之熱裂解速率均遠大於100°C，且其熱裂解均符合一次反應。在相同加熱溫度下，固態的PAH較PAH溶液安定。100°C加熱時，BaA具有最大的裂解速率數，其次為BaP 和DBahA； 200°C加熱所得到的結果與100°C類似，但BaA的安定性郤較BaP大。