西安城市不同功能区街道灰尘磁学特征及环境污染分析

发布时间：2018-03-25 08:01

本文选题：街道灰尘　切入点：磁学特性　出处：《环境科学》2017年03期

【摘要】：为了解西安城市不同功能区的环境现状,通过采集西安城市不同功能区街道灰尘的样品,进行系统的环境磁学实验分析并结合扫描电子显微镜研究表明,街道灰尘中磁性矿物含量相对较高,多畴和假单畴的低矫顽力软磁性矿物为主要的载磁矿物,还含有赤铁矿等高矫顽力的硬磁性矿物.磁化率、饱和等温剩磁、低矫顽力软磁性矿物和非磁滞剩磁磁化率与饱和等温剩磁比值等磁性参数揭示出街道灰尘的磁学特征在西安城市不同功能区的差异以及污染的主要来源,根据污染程度划分为重度污染区、中度污染区和轻度污染区并对应西安市7个城市功能区:mP灞生态区(F区)为重度污染区,磁性物质含量较高,表明环境污染相对较重,污染的主要来源为"工业+交通";高新技术产业开发区(A区)和中心商务区(B区)磁性物质含量相对较高,粗颗粒物质相对较少,是中度污染的区域,其污染源分别为"工业"和"交通";经济技术开发区(C区)、科教商业区(D区)、科教文化产业区(E区)和教育科技产业区(G区)城市主要功能具有相似性,是轻度污染的区域,污染源主要为"交通".
[Abstract]:In order to understand the environmental status of different functional areas of Xi'an city, the samples of street dust in different functional areas of Xi'an city were collected, and the results of environmental magnetic experiments and scanning electron microscopy (SEM) showed that, The content of magnetic minerals in street dust is relatively high. The low coercivity soft magnetic minerals of multi-domain and pseudo-single domain are the main magnetic carrier minerals, and also contain hard magnetic minerals with high coercivity such as hematite, such as hematite, magnetic susceptibility, saturation isothermal remanence, The magnetic parameters such as soft magnetic minerals with low coercivity and the ratio of magnetic susceptibility to saturation isothermal remanence of non-magnetic hysteresis reveal the difference of magnetic characteristics of street dust in different functional areas of Xi'an city and the main sources of pollution. According to the degree of pollution, it was divided into serious polluted area, moderate polluted area and light polluted area, corresponding to 7 urban functional districts of Xi'an, namely: MP-Ba ecological area, F) as heavy polluted area, and the magnetic material content was high, which indicated that the environmental pollution was relatively heavy. The main sources of pollution are "industrial traffic"; area A of high-tech industrial development zone) and area B of central business district.) the content of magnetic material is relatively high, and the content of coarse particulate matter is relatively less, so it is a moderately polluted area. The pollution sources are "industry" and "traffic" respectively; the economic and technological development zone is located in area C, the science and education business district is located in area D, the science and education and culture industry district is in area E) and the education and science and technology industry district is located in area G).) the main functions of the city are similar and are regions with mild pollution. The main source of pollution is "traffic".
【作者单位】：宝鸡文理学院陕西省灾害监测与机理模拟重点实验室;兰州大学西部环境教育部重点实验室;
【分类号】：X513

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