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在中国城市门的PM_2.5的氧化潜力来源贡献的变化,中国

Jia-Min Li¹, Si-Min Zhao¹, Qi-Yu Miao¹

¹Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361102, China; Center for Marine Environmental Chemistry and Toxicology, College of Environment and Ecology, Xiamen University, Xiamen 361102, China.

Journal of environmental sciences (China)

|August 24, 2024

概括

门的PM2.5毒性下降,尽管总体质量较低,但质量正常化的氧化潜力增加. 水溶性金属是这种毒性的关键因素.

科学领域:

环境化学环境化学
空气污染科学空气污染科学
毒理学毒理学毒理学

背景情况:

颗粒物 (PM2.5) 毒性是复杂的,不仅仅取决于质量度.
了解PM2.5氧化潜力的化学驱动因素对于准确的风险评估至关重要.
门先前的研究表明,PM2.5含量显著,并与此相关的健康风险.

研究的目的:

调查2017/2018年至2022年间在门的PM2.5化学成分和氧化潜力的变化 (二二甲醇测定,DTT).
确定PM2.5氧化潜力的主要贡献者.
评估排放变化对PM2.5毒性及其相关健康风险的影响.

主要方法:

化学分析PM2.5 (碳酸性物种,水溶性离子,金属).
通过dithiothreitol (DTT) 试验测量氧化潜力 (体积规范的DTTv和质量规范的DTTm).
积极矩阵因数分解-多重线性回归 (PMF-MLR) 建模,将DTTv归因于排放源.

主要成果:

PM2.5质量度下降了55%,而体积正常化的DTT (DTTv) 下降了38%,质量正常化的DTT (DTTm) 增加了44%.
水溶性金属被确定为DTT活动的主要贡献者.
来源分配显示,车辆排放,燃煤/生物质燃烧,船舶排放和二次气溶对DTTv的贡献有显著的减少,除了尘埃/海盐和工业排放的增加外.

结论:

门的PM2.5毒性降低了,但由于化学成分的变化,其每单位质量的氧化潜力增加了.
针对车辆废气,燃煤和船舶燃料的排放控制策略已有效地减少了毒性贡献.
持续监测和特定来源的排放控制是必要的,以进一步减轻与PM2.5.5相关的健康风险.

关键词:

化学成分化学成分年间变化变化.有氧化潜力可能存在.这就是PMF-MLR.来源分配的分配方式

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