燃烧参数在与计划烧除相关条件下对多环芳烃排放的影响
Effect of Burn Parameters on PAH Emissions at Conditions Relevant for Prescribed Fires
AI总结：
本研究通过受控燃烧实验发现，在特定燃料含水率、热负荷和氧气浓度条件下，东部白松燃烧排放的高摩尔质量PAH可减少77%，致癌风险降低50%以上。
摘要：
野火烟雾是一种健康危害，因为它含有致癌挥发性化合物和细颗粒物的混合物。特别是，多环芳烃（PAHs）的暴露是一个主要问题，因为这些化合物已被认为是烟雾暴露总体致癌风险的重要贡献者。在这项工作中，使用飞行时间质谱法对东部白松（Pinus strobus）燃烧产生的气相和颗粒相PAH排放进行了定量分析，燃烧条件范围覆盖了野火和计划烧除的代表性条件。这些实验能够控制燃料水分、热通量和氧气浓度等条件，以了解它们对PAH排放的影响。我们发现，燃料含水率为20–30%、样品热负荷为60–70 kW/m²、燃烧环境氧气浓度为5–15%的最佳条件可以将高摩尔质量PAH的排放减少高达77%。我们的分析表明，在最佳条件下，相对致癌风险可以降低50%以上，这为减少森林处理活动的排放暴露提供了一种途径。
英文摘要：
Wildfire smoke is a health hazard as it contains a mixture of carcinogenic volatile compounds and fine particulate matter. In particular, exposure to polycyclic aromatic hydrocarbons (PAHs) is a major concern, since these compounds have been recognized as important contributors to the overall carcinogenic risk of smoke exposure. In this work, gas and particle-phase PAH emissions from the combustion of Eastern White Pine (pinus strobus) were quantified using time-of-flight mass spectrometry over a range of burn conditions representative of wildfires and prescribed fires. These experiments allow for controlling conditions of fuel moisture, heat flux, and oxygen concentration to understand their impact on PAH emissions. We find that optimal conditions for fuel moisture content of 20 - 30%, heat load onto the sample of 60 - 70 kW/m$^2$, and oxygen concentrations of the burn environment of 5 - 15% can reduce the emissions of the heavy molar weight PAHs by up to 77%. Our analysis shows that the relative carcinogenic risk can be reduced by more than 50% under optimal conditions, offering a way for reducing emission exposure from forest treatment activities.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
