| 钢铁厂周围不同污染介质的磁学性质及环境意义 |
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| 引用本文： | 张春霞,黄宝春,刘青松.钢铁厂周围不同污染介质的磁学性质及环境意义[J].地球物理学报,2009,52(11):2826-2839. |
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| 作者姓名： | 张春霞 黄宝春 刘青松 |
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| 作者单位： | 中国科学院地质与地球物理研究所，岩石圈演化国家重点实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 为了通过钢铁厂周围不同污染介质的磁学性质研究,实现对环境污染的有效监测,本文系统地采集了河北兴隆和湖南娄底两个钢铁厂周围的树皮和草表面的飞灰、土壤及不同树种的年轮样品.其中前三者用来反映现今污染源,而树木年轮用来追踪长时间尺度的污染历史.通过综合岩石磁学实验分析（包括热磁曲线、磁滞性质和低温实验等）、电子扫描电镜(SEM)和能谱(EDX)以及X射线衍射(XRD)分析,发现钢铁厂周围现今污染源中的主要粗颗粒磁性矿物为磁铁矿、赤铁矿和纯铁.其中8~50 μm的球形磁铁矿颗粒和呈棱角状的铁颗粒是钢铁厂污染物的特征磁性矿物.对不同树种来说,其中香樟树和枫树树木年轮中的磁性矿物以顺磁性物质为主, 不适合用于环境磁学的污染监测.而柳树中的磁性矿物（主要为磁铁矿）与现今污染源的磁性矿物相符.以上研究表明多参数岩石磁学测量并辅以微观分析等手段,可以精确地提取磁性矿物的种类及粒度特征, 判别重工业区污染源,为应用磁学方法来监测环境污染提供依据.
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| 关 键 词： | 钢铁厂 飞灰 土壤 树木年轮 岩石磁学 环境磁学 重工业区污染 |
| 收稿时间： | 2009-1-9 |
| 修稿时间： | 2009-9-28 |
Magnetic properties of different pollution receptors around steel plants and their environmental significance |
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| ZHANG Chun-Xia,HUANG Bao-Chun,LIU Qing-Song.Magnetic properties of different pollution receptors around steel plants and their environmental significance[J].Chinese Journal of Geophysics,2009,52(11):2826-2839. |
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| Authors: | ZHANG Chun-Xia HUANG Bao-Chun LIU Qing-Song |
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| Institution: | State Key Laboratory of Lithospheric Evolution (SKL-LE), Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Our aim is to effectively monitor environmental pollution around steel plants using magnetic properties of different material:fly ashes on the surfaces of tree bark,grass and garden,soil,and tree ring cores from four different trees.Samples were collected from the vicinity of two steel plants,located at Xinglong County (Hebei Province) and Loudi County (Hunan Province),respectively.Environmental pollution on different time-scales could be assessed by using grass as short-term receptor tree bark and soil as short-to medium-term receptors and tree ring cores as medium- to long-term receptor.Magnetic measurements included temperature-dependence of magnetic susceptibility and remanence,hystersis loops,First-Order Reversal Curves (FORCs) and low-temperature experiments,and microscopic SEM,EDX and XRD analyses.The results indicate that the fly ashes and soil samples are predominated by magnetite,hematite and pure iron.Magnetite grains are spherical and grain size in different receptors ranges from 8 to 50 μm whilst the pure iron grains generally have an irregular shape.Low-temperature measurements show that magnetite grains exist in the tree ring cores of willow,whereas the tree rings cores of polar,maple and camphor are most likely dominated by para-or supermagnetic minerals whereas ferromagnetic minerals are scarce or absent.This suggests that only the willow tree ring core could serve as a magnetic indicator for long-term pollution induced by the heavy industry activity. We conclude that rock magnetic and microscopic investigations could be an effective method for determining magnetic minerals and grain sizes of ferromagnets induced by heavy industry activity; they provide a rapid and useful technique for monitoring environmental pollution. |
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| Keywords: | Steel plants Fly ash Soil Tree ring Mineral magnetism Environmental magnetism Heavy industry-induced pollution |
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