海口湾海水环境质量状况分析

Analysis on Sea Water Quality Status in Haikou Bay

根据海口湾2018年10月水质调查资料,对该海域环境质量状况进行分析。采集海口湾海域20个站位的海水样品,测定海水中化学需氧量(COD)、无机氮(DIN)、活性磷酸盐(DIP)等的浓度;采用单因子污染指数法对污染程度、有机污染指数法对有机污染、海水富营养化指数对海水富营养化水平进行评价。海口湾海域海水中COD评价浓度为0.83 mg/L,DIN平均浓度为0.1800 mg/L,DIP平均浓度为0.0116 mg/L。单因子污染指数法评价结果显示,COD、DIP浓度符合海洋功能区划。DIN浓度超标率为5%,有机污染指数法均<1,海水质量总体较好,局部海域海水呈富营养化状态。

The sea water quality status in Haikou Bay was analyzed according to the survey data in the October 2018 of Haikou Bay. The 20 sea water samples were collected of Haikou Bay in October 2018. The COD, DIN and PO4-P were determined. The pollution status of sea water was assessed by the index technique of single factor. The organic pollution level was assessed by organic pollution index method. The eutrophication level of sea water was assessed by the method of eutrophication index. The mean concentration of COD, DIN and PO4-P of Haikou Bay sea waters were 0.83 mg/L, 0.1800 mg/L, and 0.0116 mg/L,respectively. The index technique of single factor showed that the concentration of COD and PO4-P meet the marine environmental requirements of the functional zoning. The over standard rate of the concentration of DIN was 5%, the organic pollution index was all less than 1. The sea water quality was good with eutrophication.