本文關(guān)鍵詞：長江安徽段江心洲土壤重金屬的分布特征及來源分析　出處：《環(huán)境科學(xué)學(xué)報(bào)》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 江心洲 重金屬 分布 來源

【摘要】：在長江安徽段15個(gè)面積較大的江心洲采集表層(0~20 cm)和深層(150~180 cm)土壤樣品,研究其重金屬元素含量的分布特征和來源.表層土壤中Cd、Hg、Pb、Cu和Zn等元素平均含量分別是深層的2.33、1.67、1.35、1.48和1.43倍.以長江沉積物背景值作為基線值進(jìn)行的地累積指數(shù)評(píng)價(jià)結(jié)果表明,土壤重金屬富集程度依次為CdHgCuZnAsPb.不同江心洲之間以及同一江心洲內(nèi)部土壤重金屬含量的差異,主要與江心洲的成因及其發(fā)育演變過程有關(guān),近期淤長的部分,土壤重金屬元素含量通常比較高.因子分析結(jié)果表明,研究區(qū)土壤重金屬的富集主要與細(xì)顆粒物質(zhì)的粒徑效應(yīng)、含鈣礦物對(duì)Cd等元素的固定,以及受燃煤影響的大氣沉降輸入有關(guān).利用因子得分-多元回歸法量化了不同來源重金屬的貢獻(xiàn),土壤粒度端元對(duì)研究區(qū)土壤Ni、Cu、Pb、Zn、As、Cd的貢獻(xiàn)率均超過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%.
【作者單位】： 南京大學(xué)地理與海洋科學(xué)學(xué)院;安徽省地質(zhì)調(diào)查院;
【基金】：國土資源大調(diào)查項(xiàng)目(No.1212010310305)~~
【分類號(hào)】：X53
【正文快照】： 1引言(Introduction)河流沉積物是水環(huán)境的重要組成部分,在未受污染的情況下,沉積物中重金屬的含量主要取決于流域巖石中重金屬的豐度(Chen et al.,2000).通過各種途徑進(jìn)入水環(huán)境的重金屬,絕大部分被吸附到懸浮顆粒物中,并隨之進(jìn)入沉積物(陳靜生,1983).當(dāng)水體p H、Eh等條件發(fā)

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