大辽河口及邻近海域的污染现状和特征

大辽河是辽东湾污染物主要输入河流,通过对大辽河口及其河口邻近海域的环境监测调查,分析大辽河口和河口邻近海域的主要污染物BOD5、COD、无机氮、无机磷和重金属等的污染状况及分布特征。调查结果表明,河口BOD5的含量均高于邻近海域的含量,而河口COD的含量与邻近海域的含量差别不大;重金属丰水期含量最高,营养盐无机氮、无机磷在平水期含量最高,因而秋季辽东湾更易发生赤潮。

The Pollution Status and Characteristics of Daliaohe Estuary and its Adjacent Sea Area

Daliaohe River is a main river which brings pollutants into Liaodong Bay of Bohai Sea.Through the environmental monitoring and survey for Daliaohe estuary and its adjacent area and analysis of the pollution status and distribution feature of the main pollutants such as BOD5,COD,inorganic nitrogen,inorganic phosphor and heavy metals were conducted.The results showed that the content of BOD5 in river estuary was higher than that in adjacent sea area,and no difference in COD content in estuary and in sea area was obseved.The contents of heavy metals were high in floodtime,but the contents of inorganic nitrogen,and inorganic phosphor were high in level water period,so the red tide occurred easily in Autumn in Liaodong Bay.