天津大沽排污口水质参数综合评价

摘要

In this paper, some indices of sulfide, organic carbon, oil and heavy metals (copper, lead, zinc, cadmium, mercury, arsenic and chromium) in the sediments from Dagu Dainage Canal at the Bohai Bay during four seasons in 2012-2013 are selected, and Water Quality Pol ution Index (API) is applied to evaluate water quality indices, aiming for the systematic evaluation of the water quality of Dagu Dainage Canal. The results showed that four stations of D3, D6, D7and D9 for S2-had the typeⅡandⅢof water;others had the typeⅠ;the total level of TOC, TPH, Cu, Pb, Zn, Cd, Hg, As and Cr were typeⅠ,Ⅳ,Ⅱ,Ⅴ,Ⅱ,Ⅴ,Ⅲ,ⅤandⅤ. Water Quality Pollution Index (API) was 3.28, which il ustrated Dagu Dainage Canal was in the state of contamination and the degree of pol ution exceeded the standard functional areas.%本研究对2012～2013年大沽排污口沉积物中硫化物、有机碳、石油类以及7种重金属（铜、铅、锌、镉、总汞、砷和铬）等水质指标的监测数据进行统计，并对其中重要的水质指标进行水污染综合指数评估，旨在对海河水质进行较为系统的评价。结果显示，D3、D6、D7和D9四个站位水质属于Ⅱ和Ⅲ类标准，其余各站位均为Ⅰ类；其余各指标（TOC、TPH、Cu、Pb、Zn、Cd、Hg、As and Cr）的总体水平依次为Ⅰ、Ⅳ、Ⅱ、Ⅴ、Ⅱ、Ⅴ、Ⅲ、Ⅴ和Ⅴ类。各站位综合评价结果得到海河流域指数为3.28，说明海河流域处于严重污染状态，其污染程度超过该流域功能区的标准。