Particle concentrations, gas-particle partitioning, and species intercorrelations for polycyclic aromatic hydrocarbons (PAH) emitted during biomass burning
Particle concentrations, gas-particle partitioning, and species intercorrelations for polycyclic aromatic hydrocarbons (PAH) emitted during biomass burning
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DOI：
10.1016/1352-2310(96)00084-2
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发表时间：
1996-11-01
影响因子：
5
通讯作者：
Williams, RB
中科院分区：
文献类型：
--
作者：
Jenkins, BM;Jones, AD;Williams, RB
在燃烧风洞中模拟了8种农林燃料（包括4种谷物秸秆和4种木质燃料）的露天燃烧。颗粒物中19种多环芳烃的浓度范围在120至4000毫克千克（-1）之间，占多环芳烃排放总量的1%至70%。弱火焰蔓延火灾的谷物被观察到产生更高水平的重PAH比更强大的火灾，与更大的分区PAH的颗粒相。个别物种的浓度出现了良好的相关性，主要是基于分子量的组内，但没有一个单一的物种被观察到与所有其他作为一个指标的PAH排放强度。在32至87摄氏度之间的采样温度下，在采样前3-5秒的停留时间内似乎没有实现气体-颗粒平衡分配，特别是对于烟道气温度较高、停留时间较短的木材燃料堆火灾排放的较重物质。总PAH排放量，颗粒相浓度，和颗粒上的PAH分数的燃烧条件比燃料类型的影响更强烈。版权所有（C）1996 Elsevier Science Ltd.
Eight types of agricultural and forest fuels including 4 cereal crop residues and 4 wood fuels were burned in a combustion wind tunnel to simulate the open burning of biomass. Concentrations for 19 PAH species in particulate matter were found to range between 120 and 4000 mg kg(-1), representing between 1 and 70% of total PAH emission. Weakly flaming spreading fires in the cereals were observed to produce higher levels of heavier PAH than more robust fires, with greater partitioning of PAH to the particle phase. Individual species concentrations appeared well correlated within groups based primarily on molecular weight, but no single species was observed to correlate with all others to serve as an indicator of PAH emission strength. Equilibrium gas-particle partitioning did not appear to be achieved within the 3-5 s residence time prior to sampling for sampling temperatures between 32 and 87 degrees C, and in particular for the heavier species emitted from wood fuel pile fires with higher stack gas temperatures and shorter residence times. Total PAH emission, particle-phase concentrations, and fraction of PAH on particles were more strongly influenced by burning conditions than by fuel type. Copyright (C) 1996 Elsevier Science Ltd.