煤炭型城市河流沉积物重金属地球化学基线厘定及应用——以安徽宿州市为例  

Geochemical Baseline of Heavy Metals in the River Sediment in Coal Production Cities and Its Application——A Case Study of Suzhou City,China

作　　者：李致春[1,2] 孙林华[3,2] 陈松[3,2] 

机构地区：[1]宿州学院环境与测绘工程学院,安徽宿州234000 [2]安徽省煤矿勘探工程技术研究中心,安徽宿州234000 [3]宿州学院资源与土木学院,安徽宿州234000

出　　处：《地球与环境》2016年第4期462-471,共10页Earth and Environment

基　　金：国家自然科学基金项目(41373095);宿州学院科研平台开放课题(2014YKF06;2013YKF06)

摘　　要：煤炭型城市是重金属富集的重要区域,国内外学者对其河流沉积物重金属地球化学基线研究较少。本研究在煤炭型城市宿州市沱河和环城河沉积物39个采样点重金属含量测试的基础上,运用相对累积频率法对Fe、Ti、V、Cr、Cu、Zn、As及Pb8种重金属地球化学基线进行厘定,并以地球化学基线值为评价标准,通过沉积物富集系数法和内罗梅指数法进行污染程度分析。结果表明:Fe、Ti、V、Cr、Cu、Zn、As和Pb的地球化学基线值分别为2.37%、0.29%、61.7mg/kg、43.0mg/kg、33.9mg/kg、62.1mg/kg、13.0mg/kg和25.3mg/kg,其中Fe、Ti、V、Cr和Pb低于安徽省土壤背景值,而Cu、Zn和As高于安徽省土壤背景值;宿州煤炭产业及其相关产业的发展导致该区域河流沉积物重金属富集程度较高,其中市中心环城河流沉积物重金属污染程度高于沱河;与背景值相比,地球化学基线的探索能够反映水体沉积物重金属元素在水-沉积物界面的反应及迁移特性,其在污染程度分析和人为影响识别的应用更具有现实意义,。Coal production cities are important area for heavy metal accumulation,and their geochemical baseline of heavy metals in river sediments was seldom concerned by domestic and foreign scholars. In this paper,heavy metal contents of 39 sampling points in sediment of Tuohe River and moat in Suzhou City,China as a coal production city were determined,and based on the contents data,geochemical baseline values of Fe,Ti,V,Cr,Cu,Zn,As and Pb were calculated using relative cumulative frequency method. Meanwhile,with geochemical baseline values as evaluation criteria of Nemero index and enrichment factor,pollution degree of heavy metals were analyzed. Results show that geochemical baseline values of Fe,Ti,V,Cr,Cu,Zn,As and Pb were 2. 37%,0. 29%,61. 7 mg / kg,43. 0 mg / kg,33. 9 mg / kg,62. 1 mg / kg,13. 0 mg / kg and 25. 3 mg / kg,respectively,meanwhile,for Fe,Ti,V,Cr and Pb,geochemical baseline below soil background value in Anhui Province,but geochemical baseline of Cu,Zn,and As above background levels. In Suzhou City,coal industry and its related industries development has led to regional sediment accumulation of heavy metals in a higher degree,and heavy metal pollution level in downtown is higher than Tuohe River. Compared with background values,exploration of geochemical baseline can reflect reaction and migration characteristics of heavy metal elements in water sediment interface,which is more practical for pollution degree analysis and application of human impact identification.

关 键 词：煤炭型城市 沉积物 重金属 地球化学基线 统计箱图 

分 类 号：X820.1[环境科学与工程—环境工程]