长春市TSP与降尘中汞含量及其对地面汞贡献的比较研究

Mercury Concentration of Total Suspended Particulates and Dustfall in Changchun City and Its Distribution to the Surface

从 1999年 8月～ 2 0 0 0年 1月 ,监测了长春市 4个功能区及一个对照点的降尘与总悬浮颗粒物上的汞含量 ,通过对时空分布规律的分析 ,得出降尘与 TSP中的汞含量有相同的空间分布特征、燃煤释放出的汞及大气中的颗粒汞主要结合在细粒径颗粒物上。汞在大气颗粒物中呈富集状态。颗粒汞对地面汞的贡献采暖期大于非采暖期 ,通过干沉降模型估算的大气颗粒汞对地面汞的贡献小于通过降尘直接测定的。

WT5”BZ]From Aug. 1999 to Jan. 2000, we determineded mercury content of TSP and dustfall in four function sites and one contrast site in Changchun. By analyzing the time and space distribution pattern, mercury emission from coal combustion and particulates mercury in the atmosphere were mainly combined with fine aersosol. The particulate Hg attributing to the surface of heating time is higher than that of nonheating time. The deposition determined by dry depositional model is lower than that determined by dustfall. [WT5”HZ]