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| 兰州市城区河道表层沉积物地球化学元素分布特征 | |
| 引用本文： | 王博,夏敦胜,余晔,田世丽,贾佳.兰州市城区河道表层沉积物地球化学元素分布特征[J].中国沙漠,2012,32(1):168-174. |
| 作者姓名： | 王博 夏敦胜 余晔 田世丽 贾佳 |
| 作者单位： | 1. 兰州大学西部环境教育部重点实验室,甘肃兰州,730000 2. 兰州大学西部环境教育部重点实验室,甘肃兰州730000／中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 3. 中国科学院寒区旱区环境与工程研究所,甘肃兰州,730000 |
| 基金项目： | 中国科学院"百人计划"项目，国家自然科学基金项目 |
| 摘 要： | 通过对兰州市河道表层沉积物地球化学元素分析发现,兰州市河道表层沉积物41种地球化学元素富集因子多小于1,Cl、S、P、Bi、Cr、Cu、Pb、Sn、U、W、Zn富集因子值均大于2,显示了较高的污染水平。对单个采样点总富集因子的分析研究发现,R值均大于2,显示出较多的富集。其中水磨沟下游和鱼儿沟下游富集因子出现高值,显示出严重污染。元素来源研究结果显示,兰州市河道表层沉积物地球化学元素的来源可分为3类:①生活污水排放以及雨水对地面或街道的冲刷作用；②工业污染,包括冶金、电镀、农药和化肥等污水的排放；③本地土壤类型灰钙土中元素的贡献。通过粒度与元素相关性分析可知,元素P、Cl主要分布于细颗粒物质中,反映了兰州市河道表层沉积物污染物质在细颗粒中有较大量的富集。 |
| 关 键 词： | 河道沉积物 元素 水体污染 兰州 粒度 |
| 收稿时间： | 2011-05-06; |
Element Characters of River Sediment of Urban Area in Lanzhou City |
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| WANG Bo,XIA Dun-sheng,YU Ye,TIAN Shi-li,JIA Jia.Element Characters of River Sediment of Urban Area in Lanzhou City[J].Journal of Desert Research,2012,32(1):168-174. | |
| Authors: | WANG Bo XIA Dun-sheng YU Ye TIAN Shi-li JIA Jia |
| Institution: | 1(1.Ministry of Education Key Laboratory of Western China’s Environmental System,Lanzhou University,Lanzhou 730000,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China) |
| Abstract: | In this study,element concentrations were investigated for 23 deposit samples collected from 8 rivers in Lanzhou urban area.Results indicate that enrichment factor values of Cl,S,P,Bi,Cr,Cu,Pb,Sn,U,W,Zn are all bigger than 2.Analysis of sediment enrichment factor shows a high pollution statue at downstream of Shuimo River and Yuer River.At certain extent,these elements come from artificial factors.The contribution of anthropogenic activities can be divided into 3 types: first is domestic sewage discharge and rain erosion on the ground or the street,and second is industrial pollution such as metallurgical industry,electro-deposition,and third is contribution of elements in soil of sierozem which is a major soil type in local area.Pearson correlation analysis between elements and grain size of river sediment indicates that pollutant always is rich in fine particles. |
| Keywords: | river sediments elements water body pollution Lanzhou particle size |
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