河南省永城市表层土壤重金属地球化学基线值厘定及其累积特征  

Determination of heavy metal geochemical baseline value of surface soil in Yongcheng,Henan,and its accumulation characteristics

作　　者：张妍[1,2] 李玉嵩 ZHANG Yan;LI Yu-song(Henan Institute of Geological Survey,Zhengzhou 450001,China;Henan Geochemical Ecological Restoration Engineering Research Center,Zhengzhou 450001,China;No.2 Institute of Geo-environment Survey,Bureau of Geology and Mineral Exploration and Development of Henan Province,Zhengzhou 450001,China)

机构地区：[1]河南省地质调查院,郑州450001 [2]河南省地球化学生态修复工程技术研究中心,郑州450001 [3]河南省地质矿产勘查开发局第二地质环境调查院,郑州450001

出　　处：《世界地质》2021年第3期728-737,共10页World Geology

基　　金：河南省地质矿产勘查开发局项目“河南省农耕区地球化学基准值与背景值研究”(豫地矿青科创[2020]2号)。

摘　　要：以河南省永城市为研究对象,系统采集组合了528件表层土壤样品(0~20 cm),测定了As、Cd、Cr、Cu、Ni、Pb和Zn等7种重金属元素,运用数理统计法、标准化方法和累积频率曲线法确定了其地球化学基线值,并结合地累积指数法对研究区不同类型土壤重金属累积程度进行了评价。结果表明:永城市表层土壤As、Cd、Cr、Cu、Ni、Pb、Zn的基线值分别为11.81、0.183、65.96、24.79、32.62、24.74和71.15 mg·kg^(-1)。地累积指数法评估表明全区样品以无累积为主,Cr、Ni的样点全为无累积;As、Cd、Cu、Pb、Zn的无--中度累积的样点数分别为4.17%、2.84%、1.33%、0.57%及0.19%,且Cd存在一个中度累积样点。各元素在砂姜黑土及碱土中均为无累积水平,壤质潮土、黏质潮土中存在无-中度累积的样点。A total of 528 surface soil samples(0~20 cm)were collected in Yongcheng of Henan and analyzed for seven heavy metals(As,Cd,Cr,Cu,Ni,Pb and Zn).The geochemical baseline values of the seven heavy metals were determined using mathematical statistics,reference element method and cumulative frequency curve method.The accumulation levels of heavy metal pollution in different types of soils were evaluated by geological accumulative index.The results showed that the mean baseline values of As,Cd,Cr,Cu,Ni,Pb and Zn in surface soils in Yongcheng were 11.81,0.183,65.96,24.79,32.62,24.74 and 71.15 mg·kg^(-1),respectively.The geological accumulation index indicated that the seven heavy metals in the most surface soils of Yongcheng were at uncontaminated level,and the samples of Cr and Ni are all uncontaminated.The proportions of no accumulation or moderate accumulation of As,Cd,Cu,Pb and Zn are 4.17%,2.84%,1.33%,0.57%and 0.19%,respectively,and there is a moderate accumulation point in Cd.Every element in lime concretion black soil and alkaline soil had no accumulation level,and there were no accumulation or moderate accumulation sample in loamy and clayey fluvo-aquic soils.

关 键 词：表层土壤 重金属 地球化学基线 地质累积特征 永城 

分 类 号：P153[天文地球—天文学]