Decomposition of Polycyclic Aromatic Hydrocarbon (PAHs) on Mineral Surface under Controlled Relative Humidity
Decomposition of Polycyclic Aromatic Hydrocarbon (PAHs) on Mineral Surface under Controlled Relative Humidity
复制标题
DOI：
10.1111/j.1755-6724.2006.tb00229.x
复制
发表时间：
2006-04
期刊：
影响因子：
--
通讯作者：
S. Tamamura;Tsutomu Sato;Yukie Ota;N. Tang;K. Hayakawa
中科院分区：
文献类型：
--
作者：
S. Tamamura;Tsutomu Sato;Yukie Ota;N. Tang;K. Hayakawa
摘要大气中多环芳烃（PAHs）由于具有致突变性和致癌性，近年来引起了人们的广泛关注。在这种情况下，芘（作为一个代表性的多环芳烃）在石英，氧化铝，蒙脱石，高岭石，腐殖酸和石英涂上吸附腐殖酸的稳定性进行了研究，在控制相对湿度（即5%和30%），没有光照射，以检测存在的催化作用矿物表面上的多环芳烃的分解。芘的稳定性强烈依赖于底物的物理化学性质。石英表面吸附有腐殖酸，但对芘的分解仍有很强的催化作用。吸附在蒙脱石和腐殖酸上的芘在实验期间（即3天）保持稳定。实验室中的湿度也影响了芘在特定矿物中的稳定性。特别是吸附在氧化铝上的芘，在较高的RH下迅速分解。然而，在石英、高岭石和腐殖酸的情况下几乎没有影响。根据气溶胶的物理化学性质和相对湿度，与大气中的矿物质相关联的多环芳烃将被分解和/或稳定地存在于大气中。
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.