| 天水市大气降尘组成特征及表面电性模拟研究 |
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| 引用本文： | 陈武,董发勤,代群威,杨杰,牛政. 天水市大气降尘组成特征及表面电性模拟研究[J]. 环境科学学报, 2013, 33(12): 3386-3390 |
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| 作者姓名： | 陈武 董发勤 代群威 杨杰 牛政 |
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| 作者单位： | 1. 西南科技大学 材料科学与工程学院, 绵阳 621010;2. 西南科技大学 固体废物处理与资源化教育部重点实验室, 绵阳 621010;2. 西南科技大学 固体废物处理与资源化教育部重点实验室, 绵阳 621010;2. 西南科技大学 固体废物处理与资源化教育部重点实验室, 绵阳 621010;2. 西南科技大学 固体废物处理与资源化教育部重点实验室, 绵阳 621010;2. 西南科技大学 固体废物处理与资源化教育部重点实验室, 绵阳 621010 |
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| 基金项目： | 国家自然科学基金重点项目（No. 41130746） |
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| 摘 要： | 对甘肃省天水市麦积镇大气降尘粒度分布及主要矿物组成进行了分析，并以实际降尘ζ电位作为参照，根据降尘中主要矿物组成的质量百分比，提出了计算法和混合法两种模拟大气降尘在水溶液中表面电性的方法.结果表明，麦积地区大气降尘属于可吸入颗粒粒度尺寸范畴，其主要矿物组成与质量含量为：石英（57.08%）、方解石（27.79%）、钠长石（10.29%）、白云母（4.84%）. 大气降尘在纯水中呈电负性，且ζ电位随着水溶液pH增加而减小.通过对比实际降尘与拟合方法所得到的ζ电位，发现两种拟合方式与实际降尘的ζ电位具有相似的变化趋势.降尘中矿物组成主导着降尘表面电位的大小和变化趋势，其对降尘表面电位的贡献率是最主要的.
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| 关 键 词： | 大气降尘 粒度分布 物相组成 表面电位 ζ电位拟合 |
| 收稿时间： | 2013-04-03 |
| 修稿时间： | 2013-07-02 |
Composition characteristics and surface charge simulation of atmospheric dust fall in Tianshui City |
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| CHEN Wu,DONG Faqin,DAI Qunwei,YANG Jie and NIU Zheng. Composition characteristics and surface charge simulation of atmospheric dust fall in Tianshui City[J]. Acta Scientiae Circumstantiae, 2013, 33(12): 3386-3390 |
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| Authors: | CHEN Wu DONG Faqin DAI Qunwei YANG Jie NIU Zheng |
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| Affiliation: | 1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010;2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010 |
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| Abstract: | Atmospheric dust fall in Maiji town of Tianshui City, Gansu Province, were investigated to track their particle size distributions and mineral compositions. Based on their zeta potential and the mass percent of main minerals, two models (calculation method and hybrid method) were presented to simulate the surface charge of atmospheric dust fall in water solution. The natural dust fall in Maiji town were categorized as the inhalable particles. Quartz (57.08%), calcite (27.79%), albite (10.29%) and muscovite (4.84%) were the four dominant compositions. Atmospheric dust fall in water solution displayed electronegativity, and zeta potential decreased with the increase of pH. Although differences existed between the two methods and natural dust fall, their change tendencies were similar. The main mineral compositions dominated the size and change tendencies of surface charge of natural dust fall. The contribution of the dominating mineral particles to zeta potential was critical. |
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| Keywords: | atmospheric dust fall size distribution phase composition surface charge simulated zeta potential |
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