如东潮间带表层沉积物重金属含量及其污染评价  

Heavy Metals in Surface Sediments of Rudong Tidal Zone and Their Contamination Evaluation

作　　者：路震[1] 张徐[1] 

机构地区：[1]南京大学地理与海洋科学学院,江苏南京210046

出　　处：《江西农业学报》2015年第5期116-119,124,共5页Acta Agriculturae Jiangxi

基　　金：中国地质调查局地质调查专项项目(1212011220053)

摘　　要：于2013年5-6月对江苏省如东潮间带表层沉积物重金属（cr、Ni、cu、zn、Pb、As、Hg、Cd）含量及其污染进行了调查，并采用地质积累指数法和潜在生态风险指数法对沉积物中的重金属污染进行了评价。结果表明：如东潮间带表层沉积物Cr、Ni、Cu、Zn、Pb、As、Hg、Cd的平均含量分别为：58．84、21．80、10．55、47．79、16．04、6．58、0．013、0．072mg／kg；地质累积指数法评价结果表明，cr、As、cu和Hg整体表现为无污染，cd、Pb、Ni、zn主要表现为轻度污染。潜在生态危害指数法评价结果表明，调查区域重金属元素的潜在危害程度大小顺序为cd〉Hg〉As〉Pb〉Ni〉cu〉cr〉zn，采样区域重金属的潜在生态危害轻微，总体上讲，该研究区未受到明显的重金属污染。From May to June of the year 2013, we investigated the contents of eight heavy metals （ Cr, Ni, Cu, Zn, Pb, As, Hg, and Cd） in the surface sediments of Rudong tidal zone in Jiangsu province, and evaluated their contamination degree in the sediments by adopting the methods of geo-accumulation index and potential ecological risk index. The investigation results showed that the average contents of Cr, Ni, Cu, Zn, Pb, As, Hg and Cd in the surface sediments of Rudong tidal zone were 58.84, 21.80, 10.55, 47.79, 16.04, 6.58, 0.013 and 0.072 mg/kg respectively. The environmental evaluation results through geo-accumulation index suggested that the sediments were not polluted by Cr, As, Cu and Hg on the whole, while were mainly mildly polluted by Cd, Pb, Ni and Zn. The potential ecological risk index suggested that the potential pollution degree of these heavy metals in the investi- gated surface sediments followed the order： Cd 〉 Hg 〉 As 〉 Pb 〉 Ni 〉 Cu 〉 Cr 〉 Zn; the potential ecological risk of eight heavy metals in sampling district was slight. In general, the studied area was not markedly polluted by heavy metals.

关 键 词：如东潮间带 表层沉积物 重金属 地质累积指数 潜在生态风险 

分 类 号：X82[环境科学与工程—环境工程]