海甸岛周边水系沉积物重金属分布及风险评价  

Heavy Metals Distribution and Risk Assessment in Stream Sediment Surrounding Haidian Island

作　　者：贺杨洋[1] 罗盛旭[1] 金瑶[1] 王智强[1] 肖钰杰 于洋[1] 罗璋[1] 

机构地区：[1]海南大学热带生物资源教育部重点实验室,海南大学材料与化工学院,海南海口570228

出　　处：《环境科学与技术》2015年第1期140-146,共7页Environmental Science & Technology

基　　金：国家自然科学基金(20867001);海南省教育厅高等学校科学研究项目(Hjkj2013-01);海南省高等学校科学研究专项项目(Hnkyzx2014-01)

摘　　要：沿海甸岛周边水系布设29个代表点采集沉积物,依据样品中As、Hg、Pb、Cd、Cr、Cu的含量、形态分布及规律,探讨沉积物粒径效应,以潜在生态危害指数法对沉积物重金属污染进行评价。结果表明:Cu、Cr对海甸溪及与其交界附近的横沟河沉积物污染已经影响到其环境质量水准,其含量与采样点沉积物p H值大小呈显著负相关,且随p H增大明显降低。重金属的生物有效性为As>Cd>Hg>Cr>Pb>Cu。相同金属在海、溪、河沉积物中的形态分布有差异,其中溪的差异性较明显。6种重金属全量均存在小粒径高富集现象,同种重金属各粒径形态分布相似,且随粒径减小,非稳定态占比增大;单种重金属潜在生态危害程度或6种重金属总潜在生态危害程度均属于轻微级。Sediment samples were collected along 29 representative points of Haidian Island. According to the content,morphological distribution of As,Hg,Pb,Cd,Cr,Cu,their laws and particle size effect were studied,and heavy metal contamination was assessed by potential ecological risk index method. Results indicated that the sediment contamination about the content of Cu and Cr has affected environmental quality in the near junction of Haidian Creek and Henggou River,its content showed a negative correlation with p H of sampling points,and decreased significantly with the increasing p H, with order of bioavailability with heavy metals as As〉 Cd 〉Hg 〉Cr〉 Pb〉 Cu. There are different morphological distributions between the sea,creek and river in the same heavy metal,with more obvious difference in the creek. They presented the same phenomenon of high content in small particle size with 6 kinds of heavy metals. The same metal has similar distribution in the morphology of particle size,and the percentage of unsteady state was increasing along with the decreasing of grain size. Potential ecological risk of single metal or total potential ecological risk of 6 metals all belong to the mild level.

关 键 词：海甸岛周边水系 沉积物 重金属 分布 生态风险 

分 类 号：X825[环境科学与工程—环境工程]