摘要
为揭示贵阳市百花湖麦西河口不同年代重金属的污染情况,同时为其防治提供科学依据,采用SWB-1型柱状采泥器采集底泥柱状剖面样,选取柱状样界面水澄清及垂直剖面分层清晰完整的底泥柱,研究重金属Hg、Cd、Cu、Zn、Pb、As的垂直分布特征,同时采用潜在生态危害指数法对重金属进行潜在的生态危害评价。结果表明:根据参照标准的不同,不同重金属元素含量超出标准值的大小顺序不同,以土壤环境质量标准作参照,百花湖麦西河口底泥中Hg>Cu>Cd>Zn>As>Pb;以中国湖泊沉积物重金属含量的平均值作参照,Hg>Cu>Zn>As>Cd>Pb;以贵阳市土壤背景值作参照,Hg>Cd>Cu>Zn>Pb>As,其中,Hg污染最严重。重金属Hg含量随深度和年代的变化呈锯齿状多峰分布特征,其他重金属随底泥深度的增加其含量变化相对较为平缓。单一元素潜在生态危害系数顺序Eir为Hg>Cd>Cu>As>Pb>Zn,潜在生态危害指数RI平均值为392.35,达到较强水平。说明,麦西河口底泥中重金属的潜在生态危害程度比较严重。
In order to reveal the heavy metal pollution in sediments from Maixi River in Baihua Lake,and provide a scientific basis for the prevention of heavy metals,Vertical distribution and characteristics of heavy metals（Hg,Cd,Cu,Zn,Pb,As） were investigated after collecting columnar sediment samples using SWB-1 bottom sampler.Meanwhile,the potential ecological risk of six heavy metals were assessed with Hakanson pontential ecological risk index.The results showed that the overproof contents of heavy metals were different according to different standards.According to the soil environmental quality standards,the order of heavy metals content arrangement was HgCuCdZnAsPb.Using the average content of heavy metal in sediments of Chinese lakes,the order of arrangement was HgCuZnAs CdPb and according to the soil values of Guiyang City,the order was HgCdCuZnPbAs.Hg pollution was the most serious no matter what standard was used.With the change of the depth and times of the sediments,the vertical distribution characteristics of Hg content increased first and then decreased,but the change of other five heavy metals content was relatively smooth.The order of ecological risk Eir was HgCdCuAsPbZn and RI was 392.35,reaching a high level.All above showed that the degree of the heavy metals potential ecological risk was serious in sediments from Maixi River in Baihua Lake.
出处
《贵州农业科学》
CAS
北大核心
2012年第3期207-210,共4页
Guizhou Agricultural Sciences
基金
贵州省科技支撑计划项目"两湖一库底泥重金属迁移转化规律
生态风险评价及生态修复技术研究"[黔科合SY字(2011)3079]
贵阳市科学技术计划项目"两湖一库沉积物磷和重金属的释放机制与原位控制技术研究"[(2010)筑科农合同字5-2]
关键词
底泥
重金属
潜在生态危害
垂直分布
麦西河口
sediments
heavy metals
potential ecological risk
vertical distribution
Maixi River
