贵州省惠水土壤-灌溉水-雨水-大气降尘中Cd、As等微量元素特征及来源讨论  

Characteristics and sources of Cd and As trace elements in soil-irrigation-rainwater-atmospheric dust-fall in Huishui County, Guizhou Province

作　　者：息朝庄 吴林锋 张鹏飞 杨茗钛 范云飞 夏浩东 邓会娟 XI Chaozhuang;WU Linfeng;ZHANG Pengfei;YANG Mingtai;FAN Yunfei;XIA Haodong;DENG Huijuan(School of Civil Engineering,Hunan City University,Yiyang 413000,Hunan,China;Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure,Yiyang 413000,Hunan,China;Nuclear Resources Geological Survey,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,Guizhou,China;Cores and Samples Center of Natural Resources,Yanjiao 065201,Hebei,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南益阳413000 [3]贵州省有色金属和核工业地质勘查局核资源地质调查院,贵州贵阳550005 [4]自然资源实物地质资料中心,河北燕郊065201

出　　处：《中国地质》2023年第1期192-205,共14页Geology in China

基　　金：贵州省耕地质量地球化学调查评价(黔耕调2017-03);湖南省自然科学基金省市联合基金项目(2022JJ50277);湖南省教育厅科学研究一般项目(20C0381)联合资助。

摘　　要：【研究目的】土壤-水体-大气降尘中Cd、As等微量元素成因来源、富集规律为环境地质研究焦点,开展惠水土壤-灌溉水-雨水-大气降尘系统中Cd、As等微量元素迁移与富集的定量研究,对该地区农业生产和农产品种植具有重要意义。【研究方法】以贵州省惠水县表层土壤、灌溉水、雨水和大气降尘样品为研究对象,分析样品中的Cd、As微量元素地球化学特征。【研究结果】结果表明:研究区以酸性土为主,147件表层土壤样品中元素Cd与As、Cr、Hg、Mn、Ni、Pb、Zn、pH呈正相关关系,与Cu、Se呈负相关关系;34件灌溉水样品中含量主要为As、B、F-、Se、Zn,灌溉水重金属元素单因子污染指数和内梅罗综合指数等级为1级,属清洁范围,表明灌溉水水质均达标;5件雨水和大气降尘样品中,大气降尘主要为As、Cd、Cr、Hg、Pb,雨水中主要为As、B、Cd、Cr^(6+)、F^(-)、Ge、Hg、Pb、Se、Zn。【结论】评价结果显示:土壤单因子污染指数Cd指数最高,内梅罗综合污染指数大小为羡塘镇红旗村>芦山镇羊马村>涟江街道大坡村>好花红镇好花红村>摆金镇立新村;灌溉水水质均达标,无重金属元素污染;大气降尘年通量密度平均值大小顺序分别为B>Se>Pb>Zn>Cr>As>F>Cd>Ge>Hg。研究区大气降尘总量平均值89 g·m^(-2)·a^(-1),与中国一些省市地区相比较,总量略低;表层土壤、大气降尘之间对比表明:表层土壤与年雨水通量相对比来看,Cd、Cr、Pb、Zn富集,Se亏损,表明雨水对Se的贡献较大;大气降尘对比于雨水,除Hg外,大气降尘其他元素都高于雨水;大气降尘年通量和表层土壤平均值比较,除Se外,其他元素均亏损;大气降尘年通量与灌溉水含量相对比,As、Hg、Se富集,Cr亏损。表层土壤重金属元素Cd污染来自于地质背景、工业三废、燃煤的综合来源;大气降尘主要来源于燃煤尘和交通尘。This paper is the result of ecological geological survey engineering.[Objective]The origin and enrichment of trace elements such as Cd and As in soil-water-atmosphere dust fall are the focus of environmental geology research.The quantitative research on migration and enrichment of trace elements such as Cd and As in soilirrigation-rain-atmosphere dust fall system was carried out in Huishui.It is of great significance for agricultural production and agricultural products planting in this region.[Methods]Taking the samples of surface soil,irrigation water,rainwater and atmospheric dust-fall from Huishui County of Guizhou Province as research objects,this paper analyzes the geochemical characteristics of trace elements such as Cd and As.[Results]The results show that the study area is dominated by acid soil.Cd is positively correlated with As,Cr,Hg,Mn,Ni,Pb,Zn and pH while it is negatively correlated with Cu and Se in the 147 topsoil elements.The 34 irrigation water samples are mainly As,B,F-,Se and Zn.The single factor pollution index and Nemero composite index of heavy metal elements from irrigation water are Level 1,belonging to the clean range,which indicates that the water quality of irrigation water is up to the standard.Among the 5 rainwater and atmospheric dust-fall samples,the atmospheric dust-fall mainly includes As,Cd,Cr,Hg and Pb and the main components of rainwater are As,B,Cd,Cr^(6+),F^(-),Ge,Hg,Pb,Se and Zn.[Conclusions]The evaluation results show that the Cd single factor pollution index is the highest,and the Nemero composite pollution index is arranged as followed:Hongqi Village,Xiantang Town>Yangma Village,Lushan Town>Lianjiang Street,Dapo Village>Haohuahong Village,Haohuahong Town>Lixin Village,Baijin Town.The irrigation water quality reaches the standard without heavy metal pollution.The order of the average annual flux density of atmospheric dust-fall is B>Se>Pb>Zn>Cr>As>F>Cd>Ge>Hg.The average total amount of atmospheric dust-fall in the study area is 89 g·m^(-2)·a^(-1),which is slightly lowe

关 键 词：Cd、As 微量元素 土壤 灌溉水 大气干湿沉降 环境地质调查工程 惠水县 贵州省 

分 类 号：X142[环境科学与工程—环境科学]