| 引用本文: | 李军,张干,祁士华,刘国卿,张伟玲.广州麓湖大气多环芳烃的干湿沉降.湖泊科学,2003,15(3):193-199. DOI:10.18307/2003.0301 |
| LI Jun,ZHANG Gan,QI Shihua,LIU Guoqing,ZHANG Weiling.Atmospheric Deposition of PAHs to a Small Urban Lake, Lake Luhu, Guangzhou. J. Lake Sci.2003,15(3):193-199. DOI:10.18307/2003.0301 |
|
| 摘要: |
| 以广州麓湖为小型城市湖泊的代表,对大气中多环芳烃的颗粒态沉降进行了连续一年的采样与分析. 结果表明,年均颗粒态多环芳烃的沉降通量为0.47mg/(m2·a). 全年直接由大气输入到麓湖的颗粒态多环芳烃总量约为0.1kg. 不同季节相比,夏季多环芳烃的沉降通量略高于秋季,而冬春季最高. 对比大气总悬浮颗粒物中多环芳烃的组成发现,当降雨量增大时,沉降颗粒物中多环芳烃的组成逐渐趋近于大气总悬浮物中多环芳烃的组成. 广州地区雨热同期、干冷咸至的季风气候特点,以及由此导致的大气颗粒物粒径变化和PAHs的气-粒分配变化,与大气PAHs污染程度一起,共同控制着沉降颗粒物中PAHs相对组成的季节变化. |
| 关键词: 多环芳烃 大气沉降 颗粒物 麓湖 |
| DOI：10.18307/2003.0301 |
| 分类号: |
| 基金项目:国家自然科学基金(40073028);中国科学院创新基地前沿项目联合资助. |
|
| Atmospheric Deposition of PAHs to a Small Urban Lake, Lake Luhu, Guangzhou |
|
LI Jun1,2, ZHANG Gan2, QI Shihua1,2, LIU Guoqing2, ZHANG Weiling2
|
|
1.Faculty of Geosciences, China University of Geosciences, Wuhan 430074, P. R. China;2.State Key Laboratory of Organic Geochemistry, GIGCAS, Guangzhou 510640, P. R. China
|
| Abstract: |
| Atmospheric concentrations and deposition fluxes of particle-associated polycyclic aromatic hydrocarbons (PAHs) were measured over a 1-year period (2001-2002) at a small urban lake, Lake Luhu, in Guangzhou, aiming to estimate their atmospheric loadings to the lake. The annual average PAH deposition fluxes was 0.47mg/(m2·a). It was estimated that within a whole year there was approximately 0.1kg of particle-associated PAHs depositing to the lake from atmosphere. Significant seasonal variations of the PAHs deposition fluxes were observed, suggesting that both highly variable atmospheric PAHs concentrations and complex scavenging processes controlled the result. In the whole year, the highest particle deposition fluxes of PAHs were observed in winter and spring and the lowest fluxes were in autumn. Compared the compositions of deposition fluxes of particle-associated PAHs to that of total suspended particle (TSP) in the air, wet deposition contributed the heavyweight PAHs to deposition fluxes, whilst dry deposition along with low temperature would favour the deposition of lightweight PAHs. With the increasing rainfall, the composition of particle-associated PAHs deposit to the urban lake became similar to that of the total suspended particulates (TSP). |
| Key words: Atmospheric deposition PAHs Lake Luhu |
