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环境持久的自由基和其他偏磁物种在野地-城市界面火灾灰中

Mahbub Alam¹, James D Sitter², Aaron K Vannucci²

¹Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC, United States.

|July 28, 2024

概括

野外城市界面火灾产生富含环境持久性自由基 (EPFR) 和过渡金属的灰. 这项研究量化了WUI火灰中的这些磁性物种,突出了其作为重要环境来源的作用.

科学领域:

环境科学环境科学
化学化学化学
地质化学地质化学

背景情况:

野外城市界面 (WUI) 的火灾会产生含有热性碳和金属氧化物的灰.
由于WUI的火灰作为对磁性物种的来源,包括环境持久的自由基 (EPFR) 和过渡金属的环境作用尚不清楚.

研究的目的:

在WUI火灰和土壤样本中检测和量化EPFR和过渡金属等等磁性物种.
为了研究灰来源,燃烧完整性,以及对磁性物种的度之间的关系.

主要方法:

电子偏磁共振 (EPR) 谱学被用来分析来自加利福尼亚州北方综合体和LNU闪电综合体火灾的53个火灰和土壤样本 (2020).
检测和量化了包括有机EPFR,氧化铁,氧化,Fe3+和Mn2+离子在内的对磁性物种.

主要成果:

在WUI火灾灰中发现有机EPFRs的高度 (1.4 × 1014到1.9 × 1017旋转g-1).
EPFR度按照下列顺序下降:植物灰 > 建筑灰 > 车辆灰 > 土壤.
随着燃烧完成度的增加,EPFR度下降 (黑色>白色>灰灰),而减少的Mn2+则增加.

结论:

在全球范围内,WUI火灰是EPFR和像Mn2+这样的减少金属物种的重要来源.
这些发现强调需要进一步研究这些偏磁物种的形成,转变以及环境/健康影响.
越来越多的WUI火灾频率和严重程度需要更深入地了解它们的生态后果.

关键词:

电子的偏磁共振是一种超磁共振.在环境中持久的自由基.LNU闪电综合体的火灾北方火灾综合体火灾综合体野地-城市接口火灾

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