乐清湾海域冬季水环境质量评价

Assessment of Water Environmental Quality of Yueqing Bay in Winter

文章根据2014年2月乐清湾海域23个站位的海水监测数据,选取pH值、溶解氧、化学需氧量、活性磷酸盐、无机氮、石油类和重金属等参数,分别采用单因子标准指数、有机污染指数、富营养化指数和综合水质指数等评价方法,综合评价水环境质量状况。结果表明,乐清湾海域水体受到严重污染,处于严重富营养状态,水环境质量较差,其中无机氮和活性磷酸盐含量过高是重要影响因素。

The pollution level of pH,dissolved oxygen（DO）,chemical oxygen demand（COD）,PO34-P,DIN,oils,Cu,Zn,Pb,Cd,Cr,Hg and As in the Yueqing Bay were evaluated based on the quarterly investigation data from 23 sampling in February 2014.The water quality was evaluated based on the single factor standard index,organic pollution index（A）,eutrophication index（E）and the comprehensive quality index（WQI）.The results showed that the seawater quality of the Yueqing bay was in the serious pollution condition,the nutritive indexes were presenting a heavy level of eutrophication,and DIN,PO34-P were major pollutants resulting in eutrophication in the bay.