左江流域崇左段沉积物重金属分布特征及生态风险  

Spatial distribution characteristics and ecological risk of heavy metals in stream sediment of the Zuojiang River

作　　者：陈彪 吕璞良 何显锦 刘芳[3] CHEN Biao;LYU Puliang;HE Xianjin;LIU Fang(Guangxi Institute of Geological Survey,Nanning 530023,Guangxi,China;Key Laboratory of Environment Change and Resources Use in Beibu Gulf/Key Laboratary ofEarthSurface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,Guangxi,China;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China)

机构地区：[1]广西壮族自治区地质调查院,广西南宁530023 [2]南宁师范大学北部湾环境演变与资源利用教育部重点实验室/广西地表过程与智能模拟重点实验室,广西南宁530001 [3]中国科学院广州地球化学研究所,广东广州510640

出　　处：《矿产与地质》2020年第3期571-578,共8页Mineral Resources and Geology

基　　金：国家自然科学基金项目资助(41867049);广西自然科学基金项目(2016GXNSFBA380106);北部湾环境演变与资源利用教育部重点实验室;广西地表过程与智能模拟重点实验室(南宁师范大学)联合开放基金(GTEU-KLOP-X1818);广西崇左市江州区土地质量地球化学评价(桂国土资办〔2017〕123号)共同资助。

摘　　要：为揭示左江流域崇左段沉积物中重金属分布特征及其生态风险,共采集了27个表层水系沉积物样品,对其进行As、Cd、Cr、Cu、Hg、Ni、Pb和Zn等8种重金属元素含量和有机质(TOC、TN)的测定。结果表明:表层沉积物中重金属含量空间离散性中等,处于较低污染状态,主要为Cd重金属元素的污染,工业区附近点位出现Hg、Pb和Zn的污染;Cd和Hg表现出中等程度的潜在生态风险;Cd、As、Cr、Cu、Ni、Pb和Zn金属之间及与有机质间呈极显著的正相关,来源基本相似,主要来源是交通污染以及城市生活废水排放,且有机质是影响重金属分布与富集的重要因素。Hg对各金属和有机质相关性较低,Hg的来源与其他组分不同,主要来源于农业灌溉区化肥及农药污染。In order to investigate the distribution characteristics of heavy metals in the stream sediment from Zuojiang River in Chongzuo region,27 samples of the surface stream sediment are collected.The organic matter(TOC,TN)and heavy metal(As,Cd,Cr,Cu,Hg,Ni,Pb and Zn)contents of the samples are analyzed.The result shows that the spatial divergence of heavy metals is moderate and in a relatively low pollution state.There is mainly the heavy metal pollution of Cd element.Hg,Pb and Zn pollution occurs near the industrial zone.Cd and Hg show potential ecology risk of moderate level.Cd,As,Cr,Cu,Ni,Pb,and Zn metals have a very significant positive correlation with the organic matter,the sources are basically similar in the region.The main sources are traffic pollution and urban domestic wastewater discharge,and the organic matter is an important factor to impact the distribution and enrichment of heavy metals.Hg has a low correlation with metals and organic matter,indicating that the source of Hg is different from other components.Hg is mainly from the fertilizer and pesticide pollution in agricultural irrigation area.

关 键 词：重金属 沉积物 来源 空间分布特征 生态风险 左江流域 

分 类 号：X832[环境科学与工程—环境工程] X820.4