长江安徽段江心洲土壤重金属的分布特征及来源分析

发布时间：2018-01-16 20:20

本文关键词：长江安徽段江心洲土壤重金属的分布特征及来源分析　出处：《环境科学学报》2017年05期 　论文类型：期刊论文

【摘要】：在长江安徽段15个面积较大的江心洲采集表层(0~20 cm)和深层(150~180 cm)土壤样品,研究其重金属元素含量的分布特征和来源.表层土壤中Cd、Hg、Pb、Cu和Zn等元素平均含量分别是深层的2.33、1.67、1.35、1.48和1.43倍.以长江沉积物背景值作为基线值进行的地累积指数评价结果表明,土壤重金属富集程度依次为CdHgCuZnAsPb.不同江心洲之间以及同一江心洲内部土壤重金属含量的差异,主要与江心洲的成因及其发育演变过程有关,近期淤长的部分,土壤重金属元素含量通常比较高.因子分析结果表明,研究区土壤重金属的富集主要与细颗粒物质的粒径效应、含钙矿物对Cd等元素的固定,以及受燃煤影响的大气沉降输入有关.利用因子得分-多元回归法量化了不同来源重金属的贡献,土壤粒度端元对研究区土壤Ni、Cu、Pb、Zn、As、Cd的贡献率均超过70%.
[Abstract]:Soil samples were collected from 15 large Jiangxinzhou (20 cm) and 150 cm (180 cm) soil samples in Anhui section of the Yangtze River. The distribution characteristics and sources of heavy metal contents in the topsoil were studied. The average contents of heavy metal elements, such as Cu and Zn, in the surface soil were 2.33 ~ 1.67 ~ 1.35, respectively. 1.48 and 1.43 times. The results of the geoaccumulation index evaluation using the background value of Yangtze River sediment as the baseline value show that. The enrichment degree of heavy metals in soil was CdHgCuZnAsPb. the difference of heavy metal contents between different Jiangxinzhou and the same Jiangxinzhou. It is mainly related to the origin of Jiangxinzhou and its development and evolution. In the part of recent siltation, the content of heavy metal elements in soil is usually relatively high. The results of factor analysis show that. The enrichment of heavy metals in the soil of the study area was mainly related to the particle size effect of fine particles and the immobilization of calcium minerals to CD and other elements. The contribution of heavy metals from different sources was quantified by factor score multivariate regression method. The contribution rate of CD was more than 70%.
【作者单位】：南京大学地理与海洋科学学院;安徽省地质调查院;
【基金】：国土资源大调查项目(No.1212010310305)~~
【分类号】：X53
【正文快照】： 1引言(Introduction)河流沉积物是水环境的重要组成部分,在未受污染的情况下,沉积物中重金属的含量主要取决于流域岩石中重金属的丰度(Chen et al.,2000).通过各种途径进入水环境的重金属,绝大部分被吸附到悬浮颗粒物中,并随之进入沉积物(陈静生,1983).当水体p H、Eh等条件发

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