双台子河口沉积物重金属溯源及生态风险评估

基于2017~2019年对盘锦双台子河口12个监测站采样点采集的沉积物6种重金属（Cu，Pb，Zn，Cd，Hg和As）的监测分析结果，采用Hakanson潜在生态风险指数法评估其生态风险，并结合监测数据中有机碳及沉积物粒径等参数，借助数理统计与Pearson相关性分析法，开展双台子河口区重金属溯源分析.结果表明：双台子河口沉积物中的重金属Pb和Zn含量均符合第一类海洋沉积物质量标准，而其他4种重金属Cu，Cd，Hg，As则存在不同程度的超标情况，超标站位比例为27.8%，2.8%，27.8%，5.5%，但均符合第二类海洋沉积物质量标准；河口东岸重金属含量高于西岸，河口顶端高于远海，部分重金属元素于该区存在较强的富集现象；双台子河口区域各重金属元素生态风险状况由高至低为Hg>Cd>As>Cu>Pb>Zn，整体上处于“中风险”水平；溯源分析发现Hg和Cd具有相似物质来源，可能为石化产业项目及海洋油气开发活动引入.Pb，Zn，Cu多来源于化石燃料的使用以及化工生产过程，As的污染源则主要来自农业.

Sources and assessment of heavy metals in sediments in Shuangtaizi estuary

Being based on the monitoring results of six heavy metals (Cu, Pb, Zn, CD, Hg and as) in sediments from 12 sample stations in Shuangtaizi Estuary of Panjin from 2017 to 2019, the potential ecological risk index method of Hakanson was used to assess the ecological risk.With the analyze of the data in organic carbon and particle size, the characteristics and sources of heavy metals were also researched by means of mathematical statistics and Pearson correlation analysis. The research showed that the contents of Pb and Zn met the first class of marine sediment quality standards, while Cu, Cd, Hg, As exceeded the standard in some extent, which the proportion of stations was 27.8%, 2.8%, 27.8% and 5.5%, respectively. However, all of them met the second class of marine sediment quality standards. The content of heavy metals in the East Bank was higher than that in the West Bank, which content decreased with the increase of offshore distance revealed that some heavy metal elements were enriched in this area. The ecological risk status in the study area was at medium risk on the whole, with an order of heavy metal risk Hg>Cd>As>Cu>Pb>Zn. Hg and Cd in the study area had the similar sources, which may be the introduction of petrochemical industry projects and offshore oil and gas development activities. Pb, Zn and Cu mostly came from the use of fossil fuels and chemical production process, while As mainly came from agricultural pollution.