Seasonal variability of 1-chloropyrene on atmospheric particles and photostability in toluene
Seasonal variability of 1-chloropyrene on atmospheric particles and photostability in toluene
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DOI：
10.1016/j.chemosphere.2004.08.069
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发表时间：
2004-11-01
期刊：
影响因子：
8.8
通讯作者：
Amagai, T
中科院分区：
文献类型：
--
作者：
Ohura, T;Kitazawa, A;Amagai, T
一种致突变化合物，1-氯芘（Cl-Py）的出现，在日本的一个城市站点的环境颗粒物提取物进行了调查。在2002年冬季（2月）、春季（5月）、夏季（8月）和秋季（11月）的1周时间里，用大容量空气采样器采集了24小时的样本。Cl-Py水平呈季节变化，夏季为2.4pg/m(3)，冬季为18.9pg/m(3)。这种变化表明，冬季较低的温度导致Cl-Py从气相到颗粒相的分布增加。此外，还有一种可能性是，环境中的Cl-Py是由季节源排放的，或者容易受到阳光的光降解，或者两者兼而有之。在室内进行了Cl-Py的光降解实验，模拟了该化合物在空气颗粒表面的命运。Cl-Py的降解过程为一级反应，速率常数为0.72h（-1）。在自由基敏化剂9,10-蒽醌（AQ）存在的情况下，Cl-Py的光降解速率比不存在AQ的情况下提高。此外，在AQ (C) 2004 Elsevier Ltd.存在的情况下，Cl-Py的脱氯（即Py的形成）发生。版权所有。
The occurrence of a mutagenic compound, 1-chloropyrene (Cl-Py), in extracts of ambient particulate matter at an urban site in Japan has been investigated. Samples were collected with a high-volume air sampler for 24h periods over the course of I week in winter (February), spring (May), summer (August), and autumn (November) 2002. The Cl-Py levels showed seasonal variation, ranging from 2.4pg/m(3) (summer) to 18.9pg/m(3) (winter). This variation would indicate that the lower temperatures in winter results in an increased distribution of Cl-Py from vapor phase to the particle phase. In addition, there is also the possibility that ambient Cl-Py is emitted from seasonal sources or is susceptible to photodegradation by sunlight, or both. The photodegradation of Cl-Py in a laboratory experiment was conducted to simulate the compound's fate on airborne particle surfaces. The degradation of Cl-Py proceeded by a first-order reaction with a rate constant of 0.72h(-1). In the presence of a radical sensitizer, 9,10-anthraquinone (AQ), the photodegradation rate of Cl-Py was elevated in comparison with the rate in the absence of AQ. In addition, the dechlorination of Cl-Py (i.e., the formation of Py) occurred in the presence of AQ (C) 2004 Elsevier Ltd. All rights reserved.