北京市区及郊区大气中的汞沉降的估算

The estimation of mercury deposition in Beijing

以Throughfall法估算出北京市 1996年大气汞干沉降率为 5 2 8.88μg·m2 ·a-1,以沉降速率估算出 1998年北京市汞的年沉降量为 6 87.5 μg·m-2 ·a-1.

According to Hg concentration in rainfall and throughfall samples collected during 1994—1996 and Hg contents in atmosphere in 1998 in Beijing, the Hg deposition was estimated. The dry deposition in 1996 was estimated to be 528.9 ?μg/(m 2·a) in Beijing. The total Hg deposition was calculated to be 657.0?μg/(m 2·a) by adding the wet Hg deposition this year. A method with velocity and Hg contents was applied to estimated the Hg deposition to be 687.5?μg/(m2·a) in Beijing in 1998.