洞察固体燃料燃烧产生的初级和二级颗粒结合甲基和酸芳香化合物排放量以及更新的源标志物
Bin Zhang1, Zhenxing Shen1, Kun He1
1Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Environmental science & technology
|September 14, 2023
概括
固体燃料的燃烧释放甲基和酸芳香化合物,影响气候和健康. 瓜亚科尔不是老化颗粒的可靠生物质追踪剂,而注射剂比率更有效地用于来源识别.
科学领域:
- 大气化学 大气化学
- 燃烧科学 燃烧科学
- 环境健康 环境健康
背景情况:
- 甲基和酸芳香化合物 (NACs) 导致辐射强迫,并对健康构成风险.
- 这些化合物起源于不完全的固体燃料燃烧和二次光化学反应.
- 了解它们的排放和转化对于空气质量管理至关重要.
研究的目的:
- 为了确定来自各种固体燃料的粒子甲基和NACs的初级排放和二次形成.
- 识别可靠的标记物,用于燃烧来源的初级和二级有机气溶.
- 评估瓜亚科尔在大气老化条件下作为生物质燃烧追踪剂的适用性.
主要方法:
- 一项现场研究利用潜在的气溶质氧化流反应器来模拟大气衰老.
- 总量甲基和NAC的排放因子 (EF) 的量化.
- 分析陈旧与新鲜的比率,以区分初级和二级有机气溶的标记物.
主要成果:
- 各种燃料的排放因子因燃烧参数的影响而有很大差异.
- 瓜亚和4--2-乙烯基被确定为主要气溶标记物;其他几种甲基作为二次有机气溶 (SOA) 标记物.
- 证实基 (•OH) 是甲基老化的主要氧化剂,而不是基 (•NO3).
- 来自生物质燃烧的老年瓜亚科尔排放档案与煤炭燃烧相比,使其成为不可靠的老年PM2.5追踪器.
- 醇/瓜亚科尔和醇/4-尼托醇的比率被证明更有效的来源的特征.
结论:
- 燃烧条件极大地影响了甲基和NAC的排放概况.
- 瓜亚科尔不适合作为生物质燃烧中老化颗粒物的唯一标志物.
- 基于注射剂的比率为老化燃烧气溶提供了更好的来源分配.
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