The regional pattern of mercury were deposition in Beijing was studied. The Hg concentrations in precipitation were detected in 0—0.83 ng/ml(summer) and in 0.371—1.73 ng/ml(winter), under extreme condition up to 3....The regional pattern of mercury were deposition in Beijing was studied. The Hg concentrations in precipitation were detected in 0—0.83 ng/ml(summer) and in 0.371—1.73 ng/ml(winter), under extreme condition up to 3.4 ng/ml in heating periods. The sum of Hg wet deposition was 101.52 μg/(m 2·a) within Nov. 1994— Nov. 1995 and 123.09 μg/(m 2·a) within Nov. 1995 — Nov. 1996. The more precipitation fall down, the more Hg was removed from atmosphere, especially in heating periods. Burning coal for heating was thought as the reason of a baseline seasonable with highest Hg levels in winter. The Hg concentration in rainfall decreased with the raining duration, which clearly shows the efficiency of washouting Hg by wet deposition.展开更多
文摘The regional pattern of mercury were deposition in Beijing was studied. The Hg concentrations in precipitation were detected in 0—0.83 ng/ml(summer) and in 0.371—1.73 ng/ml(winter), under extreme condition up to 3.4 ng/ml in heating periods. The sum of Hg wet deposition was 101.52 μg/(m 2·a) within Nov. 1994— Nov. 1995 and 123.09 μg/(m 2·a) within Nov. 1995 — Nov. 1996. The more precipitation fall down, the more Hg was removed from atmosphere, especially in heating periods. Burning coal for heating was thought as the reason of a baseline seasonable with highest Hg levels in winter. The Hg concentration in rainfall decreased with the raining duration, which clearly shows the efficiency of washouting Hg by wet deposition.
