摘要
为掌握南京城市湖泊表层沉积物中重金属的污染概况及其潜在生态风险,选取玄武湖、月牙湖、紫霞湖、琵琶湖和前湖5个主要湖泊为研究对象,应用电感耦合等离子体原子发射光谱法(ICP-AES)分析表层沉积物中Cd、Cr、Cu、Ni、Pb和Zn含量,并采用地累积指数法和潜在生态风险指数法对重金属污染风险和潜在生态危害进行评价。结果表明,湖泊表层沉积物中Cd、Cr、Cu、Ni、Pb和Zn含量分别为0.8～5.1、10.3～67.6、6.2～70.5、未检出～53.2、12.9～55.9和40.6～456.3 mg.kg-1。地累积指数法评价结果显示,6种重金属元素累积程度由高到低依次为Cd、Zn、Pb、Cu、Ni和Cr,其中Cd处于偏中等累积到重累积水平。潜在生态风险指数法评价结果显示,表层沉积物重金属污染最严重的是月牙湖,其次是前湖和紫霞湖,这3个湖泊都处于中等潜在生态风险状态,琵琶湖和玄武湖处于低潜在生态风险状态。
In order to investigate heavy metal pollution and its potential ecological risk in surface sediments of urban lakes in Nanjing,samples of sediments in five urban lakes（Lake Xuanwu,Lake Yueya,Lake Zixia,Lake Pipa and Lake Qianhu） were collected for analysis of concentrations of six heavy metals,i.e.Cd,Cr,Cu,Ni,Pb and Zn using the inductively coupled plasma-atomic emission spectrometry（ICP-AES）,and potential risks of the pollutants were assessed with the geo-accumulation index method and the potential ecological risk index methods,separately.Results show that the concentrations of the heavy metals in the lake sediments were in the range of 0.8-5.1 mg·kg-1 for Cd,10.3-67.6 mg·kg-1 for Cr,6.2-70.5 mg·kg-1 for Cu,undetectable-53.2 mg·kg-1 for Ni,12.9-55.9 mg·kg-1 for Pb and 40.6-456.3 mg·kg-1 for Zn.Analysis with the geo-accumulation index method indicated that the six heavy metals followed the order of Cd Zn Pb Cu Ni Cr in accumulation degree.Cd was at the level varying from moderate-on-the-severe-side to severe in accumulation.Risk assessment using the potential ecological risk index method showed that among the five lakes,Lake Yueya ranked the first in heavy metal pollution of the surface sediment and was followed by Lake Qianhu,Lake Zixia,Lake Pipa and Lake Xuanwu.The first three lakes were in the category of moderate in ecological risk,while the last two were in the category of low in ecological risk.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2011年第6期37-42,共6页
Journal of Ecology and Rural Environment
基金
国家自然科学基金(41001044
41101052)
中央高校基本科研业务费专项资金(2009B01714)
江苏省自然科学基金(BK2010522
BK2011876)
中国科学院南京地理与湖泊研究所引进人才启动项目(NIGLAS2010QD10)
河海大学水文水资源与水利工程科学国家重点实验室开放基金(2010490311)
河海大学大学生创新训练计划(NJ2011039)
关键词
重金属
城市湖泊
沉积物
地累积指数
潜在生态风险指数
南京
heavy metal
urban lake
sediment
geo-accumulation index
potential ecological risk index
Nanjing
