首页 | 本学科首页   官方微博 | 高级检索  
     

兰州市城区河道表层沉积物磁性特征研究
引用本文:王博,夏敦胜,余晔,王丽,田世丽. 兰州市城区河道表层沉积物磁性特征研究[J]. 环境科学, 2010, 31(8): 1740-1748
作者姓名:王博  夏敦胜  余晔  王丽  田世丽
作者单位:王博,WANG Bo(兰州大学西部环境教育部重点实验室,兰州,730000);夏敦胜,XIA Dun-sheng(兰州大学西部环境教育部重点实验室,兰州730000;中国科学院寒区旱区环境科学与工程研究所,兰州730000);余晔,王丽,田世丽,YU Ye,WANG Li,TIAN Shi-li(中国科学院寒区旱区环境科学与工程研究所,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 
摘    要:通过系统的环境磁学测定,分析了兰州市城区河道表层沉积物的磁学性质及其对城市污染的指示意义.结果表明,兰州市城区河道表层沉积物样品磁性特征以亚铁磁性矿物的磁铁矿为主导,同时存在少量赤铁矿和针铁矿贡献.根据参数χFD、χARM、χFD/MS和χARM/MS所指示的人为活动排放物对不同河段沉积物的贡献量将兰州市河流分为3类:末端集中型(排洪沟、寺儿沟、鱼儿沟、水磨沟),源头集中型(七里河、烂泥沟),影响较小型(罗锅沟、大沙沟).与有机质测量结果比较发现,兰州市河道沉积物样品有机质含量与超顺磁颗粒及单畴晶粒具有十分显著的正相关关系,说明了细颗粒磁性矿物对有机碳的富集作用,显示了超顺磁颗粒及单畴颗粒含量作为兰州市城区河道表层沉积物有机质含量的代用指标具有良好的指示意义.

关 键 词:河道沉积物  环境磁学  水体污染  兰州市  有机质
收稿时间:2009-10-07
修稿时间:2010-01-07

Characters of River Sediment of Urban Area in Lanzhou
WANG Bo,XIA Dun-sheng,YU Ye,WANG Li and TIAN Shi-li. Characters of River Sediment of Urban Area in Lanzhou[J]. Chinese Journal of Environmental Science, 2010, 31(8): 1740-1748
Authors:WANG Bo  XIA Dun-sheng  YU Ye  WANG Li  TIAN Shi-li
Affiliation:Key Laboratory of Western China's Environmental System (Ministry of Education), Lanzhou University, Lanzhou 730000, China. wangb_09@lzu.cn
Abstract:A total of 23 deposits samples were collected from 8 selected the river sediments in Lanzhou urban area as researching objects of magnetic property and organic matter measure. The results indicate that: (1) the magnetic property controlled by magnetite which is ferrimagnetic mineral, and anti-ferromagnetic component such as hematite and goethite; (2) the value of samples' magnetic parameters (such as: chi, SIRM, magnetic hysteresis loops and M-T curves) increased from upstream to downstream in Paihong River, Shier River and Yuer River, Shuimo River; decreased in Qili River and Lanni River; and contrasting above-mentioned, the value of samples' magnetic parameters were low in Luoguo River and Dasha River. Based on the variation of magnetic parameters, such as chiFD, chiARM, chiFD/Ms and chiARM/Ms, we divided the rivers into three groups according to the contribution originating from anthropogenic activities into spatial river sediments: first type, such as Paihong River, Shier River, Yuer River and Shuimo River, called downstream concentrate type; second type, such as Qili River and Lanni River, called upstream concentrate type; third type, such as Luoguo River and Dasha River, called less affected type. Bulk samples also demonstrate a strong linear positive correlation between magnetic parameters chiFD, chiARM and the content of organic matter, which reflected the content of superparamagnetic and single domain grains were nice proxy parameters of the content of organic matter of river sediments.
Keywords:river sediments   environmental magnetism   pollution of water bodies   Lanzhou City   organic matter
本文献已被 CNKI 万方数据 PubMed 等数据库收录!
点击此处可从《环境科学》浏览原始摘要信息
点击此处可从《环境科学》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号