摘要
通过测定东湖通道沿线沉积物中8种重金属含量(As、Cd、Fe、Cu、Ni、Pb、Hg和Zn)评价重金属污染生态环境风险。通过室内模拟试验分析人工干扰下沉积物的重金属释放风险。结果表明各重金属平均含量均高于湖北省土壤重金属背景值,团湖湖心以及东湖通道工程沿线近岸带沉积物中重金属含量偏高。潜在生态风险危害指数法结果显示7种重金属的生态风险排序为:Cd>Hg>As>Pb>Cu>Ni>Zn,Cd的Ei值最高,为130.81,生态风险危害等级处于强水平,多数重金属单项生态风险危害等级处于轻微水平。地积累指数法评价结果显示污染程度级别排序为:Cd>Pb=Cu>Zn>As>Hg=Ni,Cd污染严重,其余6种重金属的污染级别为无-中度污染水平。室内模拟实验人工扰动下沉积物重金属向水体释放风险最大的为Cd和As,沉积物中重金属存在一定的释放风险。
Concentrations of heavy metals including As,Cd,Cu,Ni,Pb,Hg,Zn and Fe in the lake＇s sediment were measured during the building of a underwater tunnel in Lake Donghu.In addition,pollution characteristics and the potential ecological risk were assessed,the releasing risk was analyzed under anthropogenic disturbance.The results suggested that the average concentrations of heavy metals,especially Cd,were high compared with the background values in terms of heavy metal in soil of Hubei Province;as to the area distribution in the Lake,heavy metal concentration in the center of Tuanhu and riparian zone along Yanhu Road was higher than those in other areas.The rankings in terms of the single potential ecological risk index were：Cd〉Hg〉As〉Pb〉Cu〉Ni〉Zn,among others,Eirvalue of Cd was the highest（130.81）,while Eir values for most of others were mildly low.On the other hand,the rankings according to the geo-accumulation index were Cd 〉Pb =Cu 〉Zn 〉As 〉Hg =Ni,Cd still,posed seriously high in the sediment,while the pollution of other six heavy metals ranged from non-pollution to moderate levels.In general,the release risk of Cd and As from sediment into water was sensitive under the man-made interference.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第8期193-198,205,共7页
Environmental Science & Technology
基金
武汉市"重度人工干扰下水环境污染处置及综合控制关键技术研究"项目资助
关键词
沉积物
重金属污染
生态风险
释放
东湖
sediment
heavy metal pollution
risks
release
Lake Donghu
