摘要
对2009年春、秋两季辽东湾西部海域共25个采样站位4种重金属含量的分布特征进行了研究,并利用潜在生态风险指数法和地质累积指数法对其污染状况进行了评价.结果表明：该海域表层沉积物中Cu、Pb、Zn和Cd平均含量范围分别为8.0~32.1、4.3~56.9、20.0~102.6、0.12~0.34 mg/kg;Cu、Pb、Zn和Cd含量平均值均高于渤海重金属背景值.在该海域表层沉积物重金属单元素平均含量的潜在生态风险指数中,Cd的风险等级已经达到＂中等＂,Cu、Pb和Zn的潜在生态风险等级＂较低＂;各重金属元素综合潜在生态风险等级属于＂中等＂,近岸及河口等海域的生态风险等级相对较高.重金属地质累积指数评价结果显示,Cu和Zn属于0级污染,Pb和Cd属于＂轻度＂污染.因此,作者建议应控制该海域近岸养殖区密度和减少养殖污染.表层沉积物中重金属和TOC含量相关性分析表明：该海域表层沉积物中重金属Cu、Pb和Zn具有一定的同源性,TOC含量对重金属分布具有一定的影响.
Four heavy metals in surface sediments from 25 sites in the western waters of Liaodong Bay in spring and autumn of 2009 were investigated. Concentrations of copper（ Cu）,lead（ Pb）,zinc（ Zn） and cadmium（ Cd） in surface sediments were measured with a flame atomic absorption spectrophotometer（ FAS）,and the sediments were also analyzed with FAS for quality control. Heavy metal pollution level were evaluated with the potential ecological risk index and the geo-accumulation index. The results showed that the average concentrations of Cu,Pb,Zn and Cr at different sites were 8. 0 ~ 32. 1,4. 3 ~ 56. 9,20. 0 ~ 102. 6,0. 12 ~ 0. 34 mg / kg,respectively. The concentrations of Cu,Pb,Zn and Cd were higher than the background values of Bohai. The potential ecological risk of Cd was in middle level and Cu,Pb and Zn were low. The potential ecological risk of heavy metals was in middle level and was higher in nearshore and estuary. The geo-accumulation index of Cu and Zn were in zero level,and Pb and Cd were low. We suggests that the aquaculture density be controlled in aquaculture area and human activities of sea farming reduced. Correlation analysis between heavy metals and TOC concentration in surface sediment showed that the elements of Cu,Pb and Zn probably had the same pollution source and TOC concentration had influenced on the distribution of heavy metals in surface sediments in the western waters of Liaodong Bay.
出处
《应用海洋学学报》
CAS
CSCD
北大核心
2015年第1期73-79,共7页
Journal of Applied Oceanography
基金
国家海洋局海域管理技术重点实验室开放研究基金资助项目(201212)
关键词
海洋环境科学
重金属
分布
污染评价
沉积物
辽东湾
marine environmental science； heavy metal； distribution； pollution assessment； sediment； Liaodong Bay
作者简介
孙钦帮（1977～），男，高级工程师；E—mail：qbsun@vip．qq．com
