广州麓湖水-气界面多环芳烃的通量分析

利用干湿沉降采样器、大流量采样器和半渗透膜装置对广州麓湖大气干湿沉降、大气中气态和颗粒态多环芳烃以及水体中溶解态多环芳烃进行了连续一年的采样监测,并在此数据基础上依据多环芳烃在大气和水体间的作用规律,计算了广州麓湖水-气界面上多环芳烃的交换通量．结果显示,每年大气将向麓湖中输送约1300g的多环芳烃,主要以菲为主,占总量的60%以上．而湖水向大气挥发约220g的多环芳烃,主要以萘为主,占总挥发的95%．不同化合物在气水交换中的主要作用方式是不同的,2-3环的化合物主要以气水界面交换为主,5-6环的化合物以颗粒物沉降为主．而4环的化合物则以三种方式并存．不同季节,除了4环的化合物的各种作用方式所占地比重有所变化外,其它化合物变化不大．

Deposition and exchange of Polycycllc Aromatic Hydrocarbons (PAHs) across air-water interface in an urban lake:Lake Luhu, Guangzhou

The wet and dry particle depositions,particle and gaseous phase PAHs in atmosphere,and dissolved phase PAHs in water were sampled by passive sampler,high-volume air sampler and semipeameiable membrane de- vice (SPMD) in Lake Luhu,respectively.According to the stagnant two-film model and Henry theory,the direc- tion and magnitude of fluxes of PAHs across the air-water interface in Luhu Lake were calculated based on the ana- lytical data.The result showed that the atmosphere deposited about 1300 g of PAHs to water and water volatilized a- bout 220 g of PAHs to atmosphere.PAHs with different molecular weights have different predominant processes across the lake water-air interface.