| Decomposition of Polycyclic Aromatic Hydrocarbon （PAHs） on Mineral Surface under Controlled Relative Humidity |
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| 作者姓名： | Shuji TAMAMURA Tsutomu SATO Yukie OTA Ning TANG Kazuichi HAYAKAWA |
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| 作者单位： | [1]Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, lshikawa, Japan [2]Institute of Nature and Environmental Technology, Kanazawa University, lshikawa, Japan |
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| 基金项目： | This study was supported by the 21st century C0E （Center of Excellence） program of the Japanese Ministry of Education, Culture, Science and Technology and Kanazawa University, Japan. We express our utmost gratitude to Mr. Chelo S. Pascua （Kanazawa University） for help with English and discussion. |
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| 摘 要： | The fate of Polycyclic Aromatic Hydrocarbons （PAHs） residing in the atmosphere has received enormous attention in recent years due to their mutagenic and carcinogenic risks on human health. In this context, the stability of pyrene （as a representative PAHs） on quartz, alumina, montmorillonite, kaolinite, humic acid and quartz coated with sorbed humic acid was investigated at controlled relative humidity （RH： i.e. 5% and 30%） without light irradiation in order to detect the presence of catalytic effect of mineral surface on PAHs decomposition. The stability of pyrene was found to depend strongly on the physicochemical properties of the substrates. Quartz showed a strong catalytic effect for the decomposition of pyrene even though it was coated with sorbed humic acid. Pyrene sorbed on montmorillonite and humic acid remained stable during the experimental period （i.e. 3 days）. Moisture in the experimental cell also affected the stability of pyrene in particular minerals. Especially, pyrene sorbed on alumina was rapidly decomposed at higher RH. However, there were almost no effect in the case of quartz, kaolinite and humic acid. Depending on the physicochemical properties of aerosols and RH, PAHs associated with minerals in the atmosphere would be decomposed and/or stably reside in the atmosphere.
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| 关 键 词： | 矿物 相对湿度 分解性能 碳氢化合物 |
| 收稿时间： | 2005-12-23 |
| 修稿时间： | 2/5/2006 12:00:00 AM |
Decomposition of Polycyclic Aromatic Hydrocarbon (PAHs) on Mineral Surface under Controlled Relative Humidity |
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| Authors: | Shuji;TAMAMURA;Tsutomu;SATO;Yukie;OTA;Ning;TANG;Kazuichi;HAYAKAWA |
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| Abstract: | The fate of Polycyclic Aromatic Hydrocarbons (PAHs) residing in the atmosphere has received enormous attention in recent years due to their mutagenic and carcinogenic risks on human health. In this context, the stability of pyrene (as a representative PAHs) on quartz, alumina, montmorillonite, kaolinite, humic acid and quartz coated with sorbed humic acid was investigated at controlled relative humidity (RH: i.e. 5% and 30%) without light irradiation in order to detect the presence of catalytic effect of mineral surface on PAHs decomposition. The stability of pyrene was found to depend strongly on the physicochemical properties of the substrates. Quartz showed a strong catalytic effect for the decomposition of pyrene even though it was coated with sorbed humic acid. Pyrene sorbed on montmorillonite and humic acid remained stable during the experimental period (i.e. 3 days). Moisture in the experimental cell also affected the stability of pyrene in particular minerals. Especially, pyrene sorbed on alumina was rapidly decomposed at higher RH. However, there were almost no effect in the case of quartz, kaolinite and humic acid. Depending on the physicochemical properties of aerosols and RH, PAHs associated with minerals in the atmosphere would be decomposed and/or stably reside in the atmosphere. |
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| Keywords: | mineral PAHs relative humidity decomposition |
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