瓯江流域沉积物重金属污染分布特征、污染程度和来源分析  

Contamination,Sources and Level of Heavy Metals in the Sediments of Oujiang River

作　　者：李文 刘静 LI Wen;LIU Jing(School of Earth Sciences,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013

出　　处：《信阳师范学院学报（自然科学版）》2023年第2期274-279,共6页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(42167063);江西省数字国土重点实验室开放基金项目(DLLJ202113);东华理工大学博士科研启动基金项目(DHBK2019028)。

摘　　要：对浙南瓯江流域表层沉积物进行了粒度、分粒级提取和重金属元素含量分析,并结合富集因子和地质累积指数研究该流域重金属污染特征和影响因素。结果显示:(1)根据粒度特征,瓯江流域可分为河流段、感潮河段上游、感潮河段下游三段,每段沉积物的物质组成和重金属含量具有显著差异;(2)瓯江上游河流段大多数地区沉积物中重金属元素含量低于或接近背景值,主要来源于自然风化过程;(3)瓯江下游河段存在轻度-中度水平的Cu、Cr、Ni、Zn污染,与温州地区高强度的经济活动和产业类型有关;(4)瓯江流域重金属含量受到“粒度效应”影响,细颗粒沉积物中元素含量较高,泥沙运移、沉积物来源等对重金属含量具有一定影响。The granulometric,geochemical and particle-size fractions separate analyses are conducted on the sediments from Oujiang rver,Zhejiang province,China.And the enrichment factor and index of geoaccumulation are conducted to assess the level of heavy metal contamination and its influence factors.The results show that:(1)According to the variations of particle size composition,Oujiang river can be divided into fluvial reach,upper tidal reach and lower tidal reach.The significant difference of the particle-size composition and heavy metal concentration is exhibited in theses reaches.(2)The heavy metals concentration of sediments from fluvial reach are approximate to background value and mainly source from natural weathering process.(3)In lower reach of Oujiang river,the Cu,Cr,Ni and Zn are identified as light to moderate pollution levels,which caused by the intensive economic activities and industrial types in Wenzhou city.(4)The heavy metals concentration of sediments from Oujiang river are significant influenced by the“particle size affect”,the fine fractions sediments have relatively higher heavy metals concentration and also affect by the sediments transportation and sediments provenance.

关 键 词：河流沉积 重金属 粒度 瓯江 

分 类 号：X823[环境科学与工程—环境工程]