福建省兴化湾有毒重金属的输入输出

Budget of Heavy Metals in Xinghua Bay,Fujian Province

基于对兴化湾大气干、湿沉降，沉积物及河（海）水的取样分析数据，主要考虑河流输入及与外海的物质交换，大气干、湿沉降和沉积作用过程重金属物质的迁移量，估算了兴化湾重金属的输入输出量。结果表明，As、Cr、Pb主要来自于河流输入，其河流输入量分别占总输入量的76．4％，78．2％和68．9％，Hg主要来自于河流输入和与外海的物质交换，Cd主要以大气干、湿沉降为输入方式，该方式的输入量占输入总量的78．8％。沉积作用是5种有毒重金属的主要输出方式，占输出总量的88．2％～100％，潮汐作用可将部分As、Cr、Pb输向外海，但也可能将Hg带入兴化湾，兴化湾Cd污染有加剧的趋势。

Based on a set of systematically monitored data, the budget of heavy metals is estimated in Xinghua Bay by considering their migration through the rivers ,sea exchange, atmospheric dry and wet deposition and deposition process. It indicates that As, Cr and Pb mainly come from the river input and account for 76.4%, 78.2% and 68.9% of the total inputs, respectively. While Hg is mainly from the river input and the sea exchange, but the atmospheric dry and wet deposition is the main input way of Cd, up to 78.8% of the total inputs. Nevertheless, the major input way for all the five toxic heavy metals is the deposition , taking up 88.2%-100% of the total outputs. Although the tidal action may take away the partial As, Cr and Pb to the sea, it is also possible to bring Hg into the bay.