"黑碳"对交通负载的地表土壤中反积累的影响
Barbora Doušová1, František Buzek2, Vladimír Machovič1
1University of Chemistry and Technology, Technicka 5, 166 28 Prague 6, Czech Republic.
The Science of the total environment
|May 11, 2024
概括
土壤中的安提蒙 (Sb) 稳定性受到交通颗粒的影响. 这些颗粒中的黑碳 (BC) 在沙性土壤中增强了Sb吸附,但可以通过阻断地点在粘土土壤中减少它.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 污染物分析 污染物分析
背景情况:
- 交通繁忙的地区由于 (Sb) 等致癌污染物而带来风险.
- 积在大气颗粒 (PM) 中,并与土壤有机物 (Corg) 相互作用.
- 了解地表土壤中的Sb稳定性对于环境风险评估至关重要.
研究的目的:
- 为了研究反 (Sb) 在表层土壤中的吸附机制和稳定性.
- 为了确定车辆产生的颗粒,特别是黑碳 (BC) 在Sb吸附中的作用.
- 为了比较不同类型的土壤 (粘土沙与粘土) 中的Sb行为,受交通相关Corg的影响.
主要方法:
- 混合吸附剂的制备,使用标准土壤和车辆产生的颗粒 (制动粉尘,柴油烟) 作为Sb来源.
- 在原始和冷 (375°C) 材料上进行吸附实验,以分离BC的作用.
- 在吸附过程中监测反 (Sb),土壤有机物 (Corg) 和铁 (Fe) 度.
主要成果:
- 在粘土砂混合物中,由于Corg衍生的活性位点,Sb的吸收能力增加到90%.
- 粘土土壤混合物显示Sb吸收能力下降了20%,因为添加的Corg阻断了活性位点.
- 原始材料和回火材料之间的趋势一致,证实了BC的关键作用和土壤特异性影响.
结论:
- 黑碳 (BC) 在交通繁忙的地表土壤中显著影响反 (Sb) 的积累和稳定性.
- 土壤类型和Corg含量是决定Sb吸附和潜在流动性的关键因素.
- Sb相互作用主要由BC介导,观察到的铁 (Fe) 的参与最小.
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