Characterisation of chemical species in PM2.5 and PM10 aerosols in Brisbane, Australia
Characterisation of chemical species in PM2.5 and PM10 aerosols in Brisbane, Australia
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DOI：
10.1016/s1352-2310(97)00213-6
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发表时间：
1997-11-01
影响因子：
5
通讯作者：
Bailey, GM
中科院分区：
文献类型：
--
作者：
Chan, YC;Simpson, RW;Bailey, GM
1993年9月至1994年8月，在澳大利亚亚热带沿海城市布里斯班代表主要土地利用模式的五个地点采集了PM10（空气动力学直径小于10μm的颗粒物）气溶胶样品。通过离子束分析和积分板激光吸收法等技术对收集的样品进行分析，并根据观察到的元素成分重建样品的化学成分。对于这些 PM10 样品，平均主要成分为地壳物质（质量百分比 25%）、有机物（17%）、海盐（12%）、元素碳（10%）和硫酸铵（7%）。 PM2.5（空气动力学直径小于 2.5 μm 的颗粒物）的气溶胶样本是通过二分采样器在其中一个地点 (GU) 收集的，该地点位于布里斯班郊区的大学建筑内，但周围有森林保护区提供的缓冲区。 GU 样品中的平均细 Br/Pb 比率高达 0.36，接近于汽车尾气中的比率，这表明尽管该地区 20 年来交通繁忙，但该地点的铅背景水平可能较低，因此森林地区是周围郊区道路灰尘的有效缓冲区。该地点的时间趋势表明，路边灰尘和工业来源的地壳物质可能占地壳物质质量的一半以上。决定布里斯班污染物扩散和农村灰尘持续输入布里斯班的季节性气象条件是影响布里斯班地壳物质水平的潜在重要因素。然而，主要的农村沙尘事件并没有显着增加地壳物质的季节性平均水平。此外，除了某些地点（例如繁忙的道路交通网络或水泥厂）受到显着的当地影响外，GU 地点的结果显示，人为源的元素和化学成分水平与重工业和商业/轻工业地点的地点相似，表明大多数人为排放在布里斯班均匀且广泛分布。 (C) 1997 爱思唯尔科学有限公司。
Aerosol samples for PM10(particulate matter with aerodynamic diameters less than 10 mu m) were collected from September 1993 to August 1994 at five sites representing the major land use patterns in Brisbane, a subtropical coastal city in Australia. The samples collected were analysed by techniques such as ion beam analysis and the integrating plate laser absorption method, and the chemical composition of the samples was reconstructed from the observed elemental composition. For these PM10 samples, the major components, on average, were crustal matter (25% by mass), organics (17%), sea salt (12%), elemental carbon (10%) and ammonium sulphate (7%). Aerosol samples of PM2.5 (particulate matter with aerodynamic diameter less than 2.5 mu m) were collected by a dichotomous sampler at one of the sites (GU), a site on university buildings located in a suburban area of Brisbane but surrounded by a buffer zone provided by a forest conservation area. A high average fine Br/Pb ratio of 0.36 in the GU samples, which is close to that in vehicle exhausts, indicates that this site probably has low background levels of lead even though there has been significant traffic in the area for 20 years, so the forest area is an effective buffer to road dust from the surrounding suburbia. Temporal trends at this site suggest that road side dust and industry-sourced crustal matter could contribute to more than half of the mass of crustal matter. Seasonal meteorological conditions which determine the dispersion of pollutants out of Brisbane and the continuous input of rural dust into Brisbane are potentially important factors influencing the level of crustal matter in Brisbane. However, major rural dust events do not considerably increase the seasonal average level of crustal matter. Also, apart from significant local influences at some sites (such as heavy road traffic network or a cement factory), the results from the GU site show a similar level of elemental and chemical components from anthropogenic sources to sites in heavy industrial and commercial/light industrial sites, indicating that most anthropogenic emissions are evenly and widely distributed in Brisbane. (C) 1997 Elsevier Science Ltd.