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首页> 外文期刊>Atmospheric chemistry and physics >Source apportionment of PMsub2.5/sub in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements
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Source apportionment of PMsub2.5/sub in Cork Harbour, Ireland using a combination of single particle mass spectrometry and quantitative semi-continuous measurements

机译：结合单颗粒质谱和定量半连续测量技术，对爱尔兰科克港PM 2.5 进行源分摊

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An aerosol time-of-flight mass spectrometer (ATOFMS) was deployed for themeasurement of the size resolved chemical composition of single particles ata site in Cork Harbour, Ireland for three weeks in August 2008. The ATOFMSwas co-located with a suite of semi-continuous instrumentation for themeasurement of particle number, elemental carbon (EC), organic carbon (OC),sulfate and particulate matter smaller than 2.5 μm in diameter(PM2.5). The temporality of the ambient ATOFMS particle classes wassubsequently used in conjunction with the semi-continuous measurements toapportion PM2.5 mass using positive matrix factorisation. The synergyof the single particle classification procedure and positive matrixfactorisation allowed for the identification of six factors, correspondingto vehicular traffic, marine, long-range transport, various combustion,domestic solid fuel combustion and shipping traffic with estimatedcontributions to the measured PM2.5 mass of 23%, 14%, 13%,11%, 5% and 1.5% respectively. Shipping traffic was found tocontribute 18% of the measured particle number (20–600 nm mobilitydiameter), and thus may have important implications for human healthconsidering the size and composition of ship exhaust particles. The positivematrix factorisation procedure enabled a more refined interpretation of thesingle particle results by providing source contributions to PM2.5mass, while the single particle data enabled the identification ofadditional factors not possible with typical semi-continuous measurements,including local shipping traffic.
机译：气溶胶飞行时间质谱仪（ATOFMS）于2008年8月在爱尔兰的科克港（Cork Harbour）部署了用于测量尺寸分辨的单颗粒化学成分的仪器，为期三周。连续仪器用于测量粒径小于2.5μm（PM 2.5 ）的颗粒数，元素碳（EC），有机碳（OC），硫酸盐和颗粒物。随后，使用正矩阵分解将环境ATOFMS粒子类别的时间性与半连续测量相结合，以比例PM 2.5 质量。单一颗粒分类程序和正矩阵分解的协同作用可确定六个因素，分别对应于车辆交通，海洋，远程运输，各种燃烧，国内固体燃料燃烧和运输交通，并具有对测得的PM 2.5 <质量分别为23％，14％，13％，11％，5％和1.5％。发现运输量贡献了所测量的颗粒数量的18％（迁移直径为20-600 nm），因此考虑到船舶尾气颗粒的大小和组成，可能对人类健康产生重要影响。正矩阵分解程序通过提供对PM 2.5 质量的贡献，可以对单粒子结果进行更精细的解释，而单粒子数据可以识别典型的半连续测量（包括局部）无法实现的其他因素运输量。

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