Potentially toxic elements distribution, petrography, and synchrotron characterization in polluted soils around industrial complex, Central Jordan

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL Journal of hazardous materials advances Pub Date : 2024-03-27 DOI:10.1016/j.hazadv.2024.100423
Tayel El-Hasan , Allayth Aldrabee , Messaoud Harfouche
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Abstract

Industry is the main source of soil pollution in Jordan, where higher concentrations of potentially toxic elements were found in the soil around industrial estates. This study is dealing with an industrial pollution hot spot that is a steel factory in central Jordan that emits various ashes and gases. This area is moderately inhibited, and its soil is increasingly utilized in agricultural activities. High Fe, Cr, Mn, Pb, and V contents were recorded in the soil adjacent to the factory mainly concentrated on the prevailing wind direction. The studied sites bear heavy metalloids concentrations exceeding the permissible limit of WHO/EPA. These concentrations were found in topsoils and they decreased downward because of low mobility due of high soil alkalinity and lower pedogenesis. Moreover, the synchrotron-based XAFS technique was used to understand changes in oxidation states of Fe atom as well as in its structural parameters with depth. EXAFS analysis reveals association of Fe atoms mainly with oxygen (O), which indicates the anthropogenic Fe source. XANES data shows that Fe occurs in divalent (Fe2+) and trivalent (Fe3+) forms, which indicates that magnetite is dominating the topsoil. This Fe-phase is usually formed during oxygenated high thermal manufacturing processes. The topsoils SEM-EDS investigations confirmed the dominance of magnetite spheres, which coincides with the positive correlation between Fe and other elements as indicated from the statistical interpretation of the data.

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约旦中部工业综合体周围受污染土壤中潜在有毒元素的分布、岩相学和同步辐射表征
工业是约旦土壤污染的主要来源,在工业区周围的土壤中发现了较高浓度的潜在有毒元素。本研究涉及的工业污染热点是约旦中部的一家钢铁厂,该厂排放各种灰烬和气体。该地区受到中度抑制,其土壤越来越多地被用于农业活动。工厂附近土壤中铁、铬、锰、铅和钒的含量较高,主要集中在盛行风向。研究地点的重金属浓度超过了世界卫生组织/美国环保局的允许限值。这些浓度出现在表层土壤中,由于土壤碱度高、成土率低,其流动性较低,因此浓度向下递减。此外,利用同步加速器 XAFS 技术了解了铁原子氧化态及其结构参数随深度的变化。EXAFS 分析表明,铁原子主要与氧(O)结合,这表明铁来源于人为活动。XANES 数据显示,铁以二价(Fe2+)和三价(Fe3+)形式存在,这表明磁铁矿在表层土中占主导地位。这种铁相通常是在含氧高热制造过程中形成的。表层土的扫描电子显微镜-电子显微镜 (SEM-EDS) 调查证实,磁铁矿球体占主导地位,这与数据统计解释所显示的铁和其他元素之间的正相关性相吻合。
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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
自引率
0.00%
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0
审稿时长
50 days
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