摘要
为了解华南地区典型燃煤电厂周边表层土壤重金属空间分布特征,对韶关市燃煤电厂周边20处农田表层土壤中7种重金属(镍(Ni)、铜(Cu)、锌(Zn)、镉(Cd)、铅(Pb)、铬(Cr)及砷(As))的总量进行检测,并分析了其相应的空间分布规律,同时评估了周边土壤重金属的生态风险并分析其来源。结果表明:该燃煤电厂周边土壤中重金属Ni、Cu、Zn、Cd、Pb、Cr及As的平均含量分别是17.79、19.59、159.08、3.14、111.01、96.61 mg/kg和21.48 mg/kg,Cd、Pb污染情况突出,重金属Zn、Cd、Pb、Cr的分布与盛行风向密切相关。综合污染指数法表明,Cd、Pb及Zn处于重污染状态;潜在生态风险指数法表明,Cd处于严重潜在生态风险状态;地累积指数法表明,Ni、Cu整体处于无污染状态,Cd整体处于高污染状态。多种统计方法表明,Zn、Cd、Pb及Cr受燃煤电厂影响明显,Cu、As的来源不仅受燃煤电厂等工业的影响,还与该地区农业灌溉用水密切相关,Ni的分布最为均匀,受自然因素影响明显。
For exploring the spatial distribution characteristics of heavy metals in the surface soil around a coal⁃fired power plant in Shaoguan City,South China,the total amount of seven heavy metals(Ni,Cu,Zn,Cd,Pb,Cr and As)in the surface soil of 20 farmlands surrounding the power plant was measured.The spatial distribution was analyzed.The ecological risk of heavy metals in the surrounding soil was evaluated and its sources were identified.The results showed that the average contents of heavy metals Ni,Cu,Zn,Cd,Pb,Cr and As in the soil around the coal⁃fired power plant were 17.79,19.59,159.08,3.14,111.01,96.61 mg/kg and 21.48 mg/kg,respectively.Pollution of Cd and Pb were serious.The distribution of Zn,Cd,Pb and Cr was closely related to the prevailing wind direction.The comprehensive pollution index showed that Cd,Pb and Zn were in heavy pollution.The potential ecological risk index indicated Cd was in a high potential ecological risk level.The ground accumulation index implied that Ni and Cu were in a non⁃pollution state,and Cd was in high pollution.Multivariate statistical analysis represented Zn,Cd,Pb and Cr were obviously affected by the coal⁃fired power plant.The sources of Cu and As were not only affected by the coal⁃fired power plant,but also closely related to agricultural irrigation water in the region.The distribution of Ni was uniform.It was obviously affected by the natural source.
作者
杨子鹏
肖荣波
陈玉萍
邓一荣
韩存亮
刘楚藩
高中原
黄淑婷
戴伟杰
YANG Zipeng;XIAO Rongbo;CHEN Yuping;DENG Yirong;HAN Cunliang;LIU Chufan;GAO Zhongyuan;HUANG Shuting;DAI Weijie(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510000,China;Guangdong Academy of Environmental Sciences Guangzhou 510000,China)
出处
《生态学报》
CAS
CSCD
北大核心
2020年第14期4823-4835,共13页
Acta Ecologica Sinica
基金
2018年国家重点研发计划专项“土专项”《污染场地修复后重金属的环境归趋与安全阻控技术》(2018YFC1801403)
广东省环境科学研究院科技创新项目(HKYKJ-201707)。
关键词
燃煤电厂
表层土壤
重金属
风险评估
源解析
coal⁃fired power plant
surface soil
heavy metal
risk assessment
source analysis
