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下茹越水库沉积物中若干重金属形态的分布及其与沉积物粒径的关系

发表时间:2013-11-15  浏览量:1021  下载量:450
全部作者: 逯超,孟耀斌,何寿亮
作者单位: 北京师范大学减灾与应急管理研究院,地表过程与资源生态国家重点实验室,环境演变与自然灾害教育部重点实验室
摘 要: 为研究半干旱半湿润地区水库中重金属各种形态分布规律,对位于滹沱河上游的下茹越水库沉积物进行采样,分析了Cu,Pb,Zn,Cr,Ni,Fe 6种重金属总含量及各种形态含量。结果发现,重金属总量、碳酸盐结合态(除Cr)、有机物结合态在沉积物表层含量较高,表层以下含量较低且变化不大。结合沉积物的粒径分布,建立了重金属各种形态含量与粒径分布关系模型,模型显示水库沉积物中Cu,Zn,Pb的可交换态在细颗粒沉积物中重金属强度最高,其他形态及总量在5~50 μm,75~100 μm 2个粒径区间呈现峰值,与重金属来源(铁矿、金矿)的粒径分布呈现很好的协同性。研究结果显示粒径在决定各种形态重金属含量方面有重要作用。
关 键 词: 自然灾害学;重金属形态;沉积物;水库;粒径分布
Title: Distribution of heavy metals� species in the sediment of Xiaruyue reservoir and its dependence on the grain size
Author: LU Chao, MENG Yaobin, HE Shouliang
Organization: Key Laboratory of Environment Change and National Disaster, MOE, State Key Laboratory of Earth Surface Processes and Resources Ecology, Academy of Disaster Reduction and Emergency Management, Beijing Normal University
Abstract: As a representative reservoir receiving mineral loadings in semi-humid/semi-arid region, Xiaruyue reservoir in the upstream of Hutuo river basin was sampled to investigate the distribution of heavy metals� species. The content of the different species of six heavy metals (Cu, Pb, Zn, Cr, Ni, Fe) was analysized. The results showed that the carbonate-bound species (except Cr), the organic-bound species as well as the total concentration of the heavy metals were considerably higher in the surface sediment layer than those below. With the grain size distributions of the sediment samples as descriptors, linear model was used to describe the dependence of heavy metal concentration, viz, the total value or the species-specific value. The optimized models highlighted two grain size ranges, viz, 5-50 μm and 75-100 μm, which contributed highly to the carbonate-, Fe-Mn-oxide-, organic-bound species of Cu, Zn and Pb. These two grain size ranges coincided respectively with the size distribution of gold mining and iron mining tailing grains, implying that grain size played a critical role in determining the concentration of heavy metals in reservoir sediments in semi-humid/semi-arid region.
Key words: natural disaster; heavy metal speciation; sediment; reservoir; grain size
发表期数: 2013年11月第21期
引用格式: 逯超,孟耀斌,何寿亮. 下茹越水库沉积物中若干重金属形态的分布及其与沉积物粒径的关系[J]. 中国科技论文在线精品论文,2013,6(21):2055-2065.
 
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