首页 | 本学科首页   官方微博 | 高级检索  
     


Discrimination between anthropogenic (pollution) and lithogenic magnetic fraction in urban soils (Delhi,India) using environmental magnetism
Authors:Narendra K. Meena  Sabyasachi Maiti  Ankush Shrivastava
Affiliation:1. Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur 721302, India;2. School of Agricultural Earth and Environmental Sciences, Department of Geology, University of KwaZulu-Natal, Durban 4000, South Africa;3. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, Bochum 44801, Germany;1. Institute of Natural Resources and Environment, Henan University, Kaifeng, Henan 475004, China;2. Collaborative Innovation Center on Yellow River Civilization of Henan Province/Key Research Institute of Yellow River Civilization and Sustainable Development, Henan University, Kaifeng, Henan 475004, China;3. Department of Urban and Environmental Science, Xuchang University, Xuchang, Henan 461000, China;1. RWTH Aachen University, Department of Geography, Aachen, Germany;2. Ludwig-Maximilians-University Munich, Department of Geography, Munich, Germany
Abstract:In this paper magnetic property of the Delhi topsoil has been used to characterize the potentially polluted areas in terms of magnetic minerals and grain (Magnetic Domain) concentration as a factor of toxic metals and other mutagenic pollutant concentration. The Saturation magnetisation (Ms) and Saturation remanence (Mrs) has been taken as proxy for ferrimagnetic mineral concentration. However, delineation of anthropogenic magnetic fraction from lithogenic (geogenic) magnetic fraction has been done by the paramagnetic/diamagnetic contribution of soil with the fact that the fresh soil contains higher paramagnetic and diamagnetic minerals than polluted. Predominantly, the topsoils of Delhi are dominated with ferrimagnetic minerals (Magnetite and Maghemite phase). Significantly the industrial areas contain highest concentration of the ferrimagnetic minerals with negligible paramagnetic/diamagnetic fraction which leads to anthropogenic contribution. Heavy traffic and densely populated areas of the Delhi exhibit moderate to low soil pollution while green areas show lowest with higher paramagnetic/diamagnetic contribution. The soils in Delhi are dominated with Pseudo-Single Domain (PSD) magnetic grain, though the industrial areas in Delhi show coarser Multidomain (MD) grains in comparison to Stable Single Domain (SSD) in forest areas. Our study reveals that the fine grain particle does not show significant link with higher concentration of ferrimagnetic minerals at least in soils. The presence of the lithogenic magnetite crystal in the forest soil and anthropogenically produced spherules in industrial areas and higher concentration of the heavy metal in Delhi soil strengthen our findings.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
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