松嫩平原黑土区西北部阿荣旗黑土重金属分布特征、评价及预警  

Distribution characteristics, evaluation and early warning of heavy metals in Arongqi black soil in northwest of Songnen black soil region

作　　者：杜贯新 闫百泉[1] 孙雨[1] 钱程[2] 秦涛[2] 臧延庆 杜继宇[2] Du Guanxin;Yan Baiquan;Sun Yu;Qian Cheng;Qin Tao;Zang Yanqing;Du Jiyu(School of Earth Sciences,Northeast Petroleum University,Daqing,Heilongjiang 163318;Shenyang Geological Survey Center of China Geological Survey,Shenyang 110034)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国地质调查局沈阳地质调查中心,沈阳110034

出　　处：《地质科学》2022年第2期606-621,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国地质调查局地质调查项目(编号:DD20190039-01)资助。

摘　　要：近年来,松嫩平原黑土区南部、东北部的一些区域已出现了重金属元素的累积,严重威胁着粮食生产安全和人体健康。为明晰黑土区西北部区域的重金属污染情况,本文以松嫩平原黑土区西北部阿荣旗为研究区,采集了32个表层黑土样品,测定As、Cd、Cr、Cu、Hg、Ni、Pb、Zn等8种重金属元素的含量,利用单因子指数法(Pi)、内梅罗综合污染指数法(NPI)、潜在风险分析法(RI)并引入生态风险预警指数法(IER)对黑土的重金属潜在生态风险进行综合研究,绘制了重金属元素的空间分布图。结果显示:Cd、Pb元素含量分别是内蒙古表层土壤背景值的1.99和1.50倍,其余6种均低于内蒙古表层土壤背景值。8种重金属元素平均含量均低于国家标准(GB15618-2018)中的风险筛值,为清洁无污染。NPI平均值为0.33,为无影响等级;潜在风险结果显示Cd中等潜在风险,RI平均值为115.36,轻微生态风险。生态风险预警结果显示:选用国家标准(GB15618-2018)中的风险筛值做参考时,无风险预警;选用内蒙古表层土壤背景值做参考时显示Cd轻警态势,Pb预警态势,其余6种元素无警态势,IER平均值为0.65,为预警态势,8种元素的RI、IER的空间分布格局相似,Cd元素为研究区黑土中的生态风险元素和预警元素。生态风险预警指数法(IER)在研究区黑土中得到了较好的应用。In recent years, heavy metal elements have accumulated in some areas in the south and northeast of Songnen black soil region, seriously threatening food production safety and human health. In order to find out the heavy metal pollution in the northwest of songnen black soil region. Thirty-two surface black soil samples were collected in Arongqi area, northwest of Songnen black soil region and the contents of eight heavy metal elements, As, Cd, Cr, Cu, Hg,Ni, Pb and Zn, were determined. Using single factor pollution index(Pi), Nemerow integrated pollution index(NPI), H?nkanson potential ecological risk index(RI) and ecological risk early warning index(IER), the potential ecological risk of heavy metals in black soil was studied comprehensively, and its spatial distribution map was drawn. The results showed that the results showed that the contents of Cd and Pb were 1.99 and 1.50 times of the background value of Inner Mongolia surface soil, respectively, and the other 6 elements were lower than the background value of Inner Mongolia surface soil, background value of surface soil in Inner Mongolia as reference. The average content of 8 heavy metal elements is lower than the risk screen value in the national standard(GB15618-2018), it shows clean(safe). The NPI was 0.33 at the clean level, results of the potential ecological risk assessment indicated that Cd fell into the medium ecological risk level, the average value of RI was 115.36, at the low ecological risk level. Results of the ecological risk warning indicated that when the risk screening value in the national standard(GB15618-2018)is used as reference, it shows no risk warning. When the background value of surface soil in Inner Mongolia as reference, Cd fell into the low ecological warning situation, Pb fell into the early ecological warning situation. The other six elements fell into no ecological warning situation. The IER average value is 0.65, indicating an early warning situation. The spatial distribution patterns of RI, IER, NPI were similar, and Cd wa

关 键 词：松嫩平原黑土区 重金属污染 生态风险 风险预警指数(IER) 阿荣旗 

分 类 号：P632.1[天文地球—地质矿产勘探]