江苏近海水域水环境质量现状评价

根据2006年7月对江苏近海水域水环境调查的资料,对江苏近海的水质进行评价.结果表明:江苏近海水域pH、活性磷酸盐、砷、铜、镉、锌、总铬等指标均达到GB 3097-1997《海水水质标准》中Ⅱ类水质标准,但是溶解氧、总磷、总氮与铅超标率较高,超标率分别达到79.10％,54.35％,34.15％和41.46％,无机氮和汞浓度超标率较低.此外,海水中还有轻微的油污染.从北至南3个海域中海州湾水质相对较好,辐射沙洲与长江口北支海域污染较为严重,并且辐射沙洲海域超标站位分布凌乱,无规律可循.

Assessment of water quality in coastal water areas of Jiangsu Province

Based on a survey of the marine environment in the coastal water areas of Jiangsu Province in July of 2006,an assessment of the quality of coastal water in Jiangsu Province was conducted.The results show that indices including pH,active phosphate,As,Cu,Cd,Zn,and total chromium all reached the Grade Ⅱ standard of the National Marine Water Quality Standards(GB?3097—1997).However,the concentrations of DO,TP,TN,and Pb exceeded the Grade Ⅱ standard,by 79.10%,54.35%,34.15%,and 41.46%,respectively.The concentrations of inorganic nitrogen and Hg had relatively low standard-exceeding rates.In addition,the marine water was slightly polluted by oil.Of the three coastal water areas from the north to the south,the water quality in Haizhou Bay was relatively good,while the water pollution in the coastal zone of radial sand ridges and the north branch of the Yangtze Estuary were relatively serious. Furthermore,the distribution of the monitoring points with standard-exceeding rates was irregular in the coastal zone of radial sand ridges.