宁波杭州湾新区海域环境质量现状评价

Evaluation of the Current Situation of Environmental Quality in Hangzhou Bay New District,Ningbo

依据2018年4月对宁波杭州湾新区附近海域的环境质量调查结果,运用富营养化指数法、沉积物重金属富集系数法、潜在生态风险指数法分析海域水体富营养化程度和沉积物重金属污染程度。结果表明,宁波杭州湾新区附近海域水质中除无机氮、活性磷酸盐站位超标率为100%外,其他指标均符合海水水质Ⅱ类标准。沉积物中除Cu的站位超标率为4%,其他指标均符合Ⅰ类海洋沉积物质量标准。所有站位富营养化指数均大于1,该海域处于较为严重的富营养化状态。沉积物重金属综合潜在生态风险系数(RI)均值为44.76,潜在生态危害轻微。

Based on the environmental quality survey results of the area near Hangzhou Bay in Ningbo in April 2018,the eutrophication index method,sediment heavy metal enrichment factor method and potential ecological risk index method were used to analyze the eutrophication of the water and the heavy metal pollution in the sediment.The results showed that in addition to the inorganic nitrogen and activated phosphate stations exceeding the standard rate of 100%in the water quality near the Hangzhou Bay New District of Ningbo,all other indicators met the second category of seawater quality standards.The rate of Cu removal from the sediments in the sediment exceeded the standard rate of 4%,and other indicators met the quality standards of the first type of marine sediments.The eutrophication index of all stations was greater than 1,and the sea area was in a relatively serious eutrophication state.The average value of the comprehensive potential ecological risk coefficient of heavy metals in the sediment was 44.76,and the potential ecological harm was slight.