贵州龙里煤矿开采的独木河流域稻田重金属地球化学基线厘定  

Determination of Heavy Metals Geochemical Baseline Value in Paddy Fields in the Dumu River Basin of Longli Coal Mine in Guizhou

作　　者：孙大丽 王虎 陈淼[1] 付天岭[1] 何腾兵[1] SUN Dali;WANG Hu;CHEN Miao;FU Tianling;HE Tengbing(College of Resources and Environmental Engineering,Institute of New Rural Development,Engineering Laboratory of Pollution Control and Resource Reuse Tec-hnology of Guizhou Province in Mountainous Livestock and Poultry,Guizhou University,Guiyang 550025,China;Guizhou Chuyang Ecological Environmental Protection Technology co.,LTD,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院/新农村发展研究院/贵州省山地畜禽养殖污染控制与资源化技术工程实验室,贵阳550025 [2]贵州雏阳生态环保科技有限公司,贵阳550025

出　　处：《地球与环境》2021年第6期707-716,共10页Earth and Environment

基　　金：贵州省科技支撑计划项目(黔科合支撑[2019]2846号)。

摘　　要：为了厘定贵州省煤矿开采流域稻田土壤地球化学基线。以龙里县独木河煤矿开采流域稻田为对象,采集稻田土壤和水稻各47个,测定了土壤中的As、Cd、Cr、Cu、Pb、Ni、V、Li和Ti共9种重金属含量,测定了稻米中的As、Cd、Cr、Cu、Pb和Ni共6种重金属含量。分别采用标准化方法和相对累积频率曲线法厘定As、Cd、Cr、Cu、Pb和Ni元素的地球化学基线值,并探讨地球化学基线适用性。结果表明,As、Cd、Cr、Cu、Pb和Ni的几何均值分别为17.665、0.489、49.374、23.842、18.97和12.874 mg/kg;标准化方法厘定的地球化学基线值分别为17.656、0.55、49.043、23.842、19.08和12.88 mg/kg;相对累积频率法厘定的地球化学基线值分别为21.643、0.54、40.39、22.303、20.53和13.08 mg/kg。结合土壤重金属基线值和稻米重金属含量限值进行分区投点分析,以标准化方法厘定的地球化学基线值为基准在投点区正确率较高的重金属元素是为Cr和Cu,以相对累积频率线法厘定的基线值为基准在投点区正确率较高的重金属元素是As、Pb和Ni,两种方法厘定的Cd基线值投点正确率相同。因此,在本研究区域可选用标准化方法厘定的Cr和Cu基线值作为参考值,相对累积频率法厘定的As、Pb和Ni基线值作为参考值,Cd元素基线值厘定可选择标准化方法或相对累积频率法。In order to determine the soil geochemical baseline of the paddy field in the coal mining watershed of Guizhou Province,the rice fields in the Dumu River Coal Mining Basin in Longli County were selected as the research area.A total of 47 farmland surface soil samples were collected and analyzed for 9 heavy metals(As,Cd,Cr,Cu,Pb,Ni,V,Li and Ti),in addition,a total of 47 rice samples were collected and analyzed for 6 heavy metals(As,Cd,Cr,Cu,Pb and Ni).The geochemical baseline values of As,Cd,Cr,Cu,Pb and Ni were determined using the reference element method and the cumulative frequency curve method,respectively,and the applicability of geochemical baselines was discussed.The results show that the geometric mean values of As,Cd,Cr,Cu,Pb and Ni are 17.665,0.489,49.374,23.842,18.97 and 12.874 mg/kg,respectively;The geochemical baseline values determined by the standardized method are 17.656,0.55,49.043,23.842,19.08 and 12.88 mg/kg respectively;The geochemical baseline values determined by the relative cumulative frequency method are 21.643,0.54,49.39,22.303,20.53 and 13.08 mg/kg,respectively.Combined the baseline value of soil heavy metals and the limit value of heavy metal in rice,the regional cast point analysis was performed.Based on the geochemical baseline value determined by the standardized method,heavy metal elements with higher accuracy in the casting area are Cr and Cu.On the contrary,baseline values of heavy metals determined by the relative cumulative frequency line method with higher accuracy rate in the casting area are As,Pb and Ni.While,the accuracy of the Cd baseline value determined by the two methods is the same.Therefore,in the study area,baseline values of Cr and Cu determined by the standardized method can be selected as the reference values;baseline values of As,Pb and Ni determined by the relative cumulative frequency method could be used as the reference values,and the baseline value of Cd can be determined by the standardized method or the relative cumulative frequency method.

关 键 词：农田 土壤 重金属 地球化学基线 稻米 

分 类 号：X53[环境科学与工程—环境工程] X820.1