使用各种方法检测出来自车辆排放的挥发性有机化合物的组成和影响的差异
Zhenzhen Niu1, Shaofei Kong2, Huang Zheng2
1Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan, 430078, China.
Environmental pollution (Barking, Essex : 1987)
|June 21, 2023
概括
这项研究比较了汽油和柴油燃料中的挥发性有机化合物 (VOC). 与蒸发相比,燃烧汽油会显著改变VOC成分,增加健康风险.
科学领域:
- 环境化学环境化学
- 大气科学 大气科学
- 分析化学 分析化学
背景情况:
- 汽车排放和燃料蒸发是挥发性有机化合物 (VOC) 的重要来源.
- 了解不同燃料类型和工艺中的挥发性有机化合物的独特化学特征和影响对于空气质量管理至关重要.
- 之前的研究还没有充分解决基于不同的测量和分析方法的VOC组成变化及其影响.
研究的目的:
- 为了比较汽油和柴油燃料在燃烧和蒸发过程中排放的挥发性有机化合物 (VOC) 组成.
- 为了评估计算和测试的VOC来源配置文件之间的差异.
- 确定特定的VOC和比率,可以区分汽油和柴油来源,并评估光化学衰老和健康风险.
主要方法:
- 从单个汽油和柴油车尾气,公路道和加油站蒸发中采集的VOC样本,使用便携式排放测量系统.
- 总共分析了107种挥发性有机化合物.
- 对比计算的VOC源配置文件 (从单个车辆类型和车队组成中得出的) 与测试的源配置文件 (从道测试中得出的).
主要成果:
- 燃烧汽油大大减少了基 (53.1%至3.6%),而燃烧柴油增加了它们 (1.3%至34.0%).
- 计算的VOC来源配置文件与测试的配置文件显示出显著差异 (差异系数 = 0.6).
- 确定了特定的化合物 (乙,乙烯,n-undecane,n-dodecane) 和比率 (/乙) 用于区分燃料类型,评估光化学年龄,并揭示燃烧汽油增加的健康风险.
结论:
- 与蒸发相比,燃烧汽油会显著改变VOC配置,增加健康风险.
- 清晰的VOC标记可以区分汽油和柴油排放.
- 这些发现支持精确的VOC来源分配和专门排放库存的开发,以改善空气质量建模.
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