| 西北典型工矿型城市街道尘埃重金属污染的环境磁学响应 |
| 摘要点击 3310 全文点击 1876 投稿时间：2014-12-31 修订日期：2015-04-15 |
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| 中文关键词 街道尘埃 环境磁学 重金属 污染负荷指数 白银市 |
| 英文关键词 street dust environmental magnetism heavy metal pollution load index Baiyin City |
| 作者 | 单位 | E-mail | | 聂燕 | 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州 730000 | niey13@lzu.edu.cn | | 王新 | 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州 730000 | | | 王博 | 中国科学院寒区旱区环境与工程研究所, 兰州 730000 | | | 许淑婧 | 信阳师范学院华锐学院理工系, 信阳 464000 | | | 高福元 | 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州 730000 | | | 余晔 | 中国科学院寒区旱区环境与工程研究所, 兰州 730000 | | | 夏敦胜 | 兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州 730000 | dsxia@lzu.edu.cn | | 夏昕鸣 | 兰州大学资源环境学院, 兰州 730000 | |
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| 中文摘要 |
| 以甘肃省白银市为研究区域,系统采集 43个城区街道尘埃样品,并对其进行环境磁学和重金属元素特征分析. 结果表明,白银市街道尘埃磁性特征以低矫顽力的磁铁矿 和磁赤铁矿为主导,磁晶体粒径为较粗的假单畴(PSD)和多畴(MD)颗粒; 样品低频磁化率(χlf)变化范围为(43.75~1340.08)×10-8 m3 ·kg-1,平均值为 245.98×10-8 m3 ·kg-1,与国内综合型大城市相比,白银市街道尘埃磁性矿物含量相对较低,但呈现明显的空间分布差异,表现为工业区高于带状交通区,带状交通区高于商业区,新城区磁性矿物含量较低; 白银市各功能区污染源相对单一,工业污染对强磁性矿物的贡献占主导,污染程度空间分异显著. 白银市街道尘埃样品中 Cu、Pb、Zn整体含量较高,污染负荷指数(PLI)与低频磁化率(χlf)、非磁滞剩磁化率(χARM)、饱和等温剩磁(SIRM)、"软"剩磁(SOFT)相关性较高,且空间变化特征较为一致,表明反映磁性矿物含量的参数可以有效监测城市重金属污染,进而圈定重金属综合污染区域和范围,为进一步的城市污染治理工作提供快速有效的证据支持. |
| 英文摘要 |
| Magnetic characteristics and heavy metal properties of 43 street dust samples collected from Baiyin City, northwest of China were systematically analyzed. The results revealed that the main magnetic minerals were low-coercivity magnetite and maghemite with coarse pseudo single domain (PSD) and multi-domain (MD) in magnetic grain size. Compared with the domestic comprehensive cities, low frequency magnetic susceptibility(χlf) value of street dust samples in Binyin varied from 43.75×10-8m3 ·kg-1 to 1340.08×10-8 m3 ·kg-1 with the average value of 245.98×10-8 m3 ·kg-1,the magnetic mineral content in street dust samples of Binyin was low relatively, but it varied among distinct districts with industrial district was the highest and the stripe traffic area was more higher than those of other regions(commercial district, new district). Different functional zones of Baiyin had a single pollution source relatively. Additionally, the contribution to strong magnetic minerals was predominated by industrial pollution and the distribution of pollution degrees in Bainyin showed a significant spatial difference. Concentrations of heavy metals(Cu, Pb, Zn) were generally high in Baiyin street dust. The significantly positive correlation between magnetic parameters(χlf, χARM, SIRM, SOFT) and pollution load index(PLI) and their consistent spatial characteristics confirm that magnetic concentration parameters can effectively monitor urban heavy metals pollution and determine the bounds and areas of pollution, providing a valuable tool for further urban pollution control. |
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