东营市北部海域沉积物中重金属的分布、来源及生态风险评价

发布时间：2018-09-14 12:15

【摘要】：2016年5月在东营市北部海域采集沉积物样品并测定7种重金属含量,分析其空间分布特征和来源,并采用沉积物质量基准(SQGs)和潜在生态风险指数(PERI)两种方法评价其生态风险.结果表明,该海域沉积物中Hg、As、Pb、Cd、Cr、Cu、Zn含量分别为0.005~0.092、3.44~10.41、6.59~19.00、0.50~1.10、32.42~60.25、1.72~23.78、31.13~69.96mg·kg~(-1);重金属含量最高值、次高值多出现在靠近挑河入海口且有机质、粉砂和黏土含量较高的S10站位.沉积物中的As、Pb主要来自岩石风化,其它金属则来自地表径流输送的陆源污染物.某些站位的As、Cd、Cr、Cu含量超出临界效应浓度(TEL),会偶尔产生不利生物毒性效应.除S10、S3、S9站位(属于高生态风险)外,该海域沉积物中的重金属处于中等生态风险,且风险主要来自Cd、Hg.为降低该海域的重金属生态风险水平,必须采取措施控制挑河等河流的重金属入海通量.
[Abstract]:In May 2016, sediment samples were collected from the northern waters of Dongying City, and the contents of seven heavy metals were determined. The spatial distribution characteristics and sources of heavy metals were analyzed, and the ecological risk was evaluated by the sediment quality benchmark (SQGs) and the potential ecological risk index (PERI). The results showed that the Hg,As,Pb,Cd,Cr,Cu,Zn content of sediments in this area was 0.005 ~ 0.092 ~ (3.44) ~ (10.41) ~ (6.59) ~ (19.00) ~ (0.50) ~ (1.10) ~ (32) ~ (32) ~ (2) ~ (2) 0.25 ~ (2) ~ 1.72.781 ~ (31.13) mg / kg~ (-1), and the highest content of heavy metals was found in the S10 station near the mouth of Xiaohe River, where the organic matter, silt and clay content were higher than those in the S10 station, where the content of heavy metal was the highest, and the content of organic matter, silt and clay was higher. As,Pb in sediments is mainly derived from rock weathering, while other metals are derived from terrestrial pollutants transported by surface runoff. The As,Cd,Cr,Cu content in some stations exceeds the critical concentration of (TEL), and occasionally produces adverse biotoxic effects. With the exception of S10 / S3 / S9 (which belongs to high ecological risk), the heavy metals in sediments in this area are in medium ecological risk, and the risk mainly comes from Cd,Hg.. In order to reduce the ecological risk of heavy metals in this area, measures must be taken to control the flux of heavy metals into the sea.
【作者单位】：中国海洋大学海洋环境与生态教育部重点实验室;
【基金】：国家自然科学基金项目(41240040) 山东省海洋资源与环境研究院委托项目
【分类号】：X145;X826

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