Size distributions of airborne microbes in moisture-damaged and reference school buildings of two construction types
Size distributions of airborne microbes in moisture-damaged and reference school buildings of two construction types
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DOI：
10.1016/s1352-2310(02)00769-0
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发表时间：
2002-12-01
影响因子：
5
通讯作者：
Nevalainen, A
中科院分区：
文献类型：
--
作者：
Meklin, T;Reponen, T;Nevalainen, A
对受潮建筑物的任何风险评估都需要准确描述导致人类接触的因素。本研究测定了室内空气中真菌和细菌的粒径分布以及学校建筑中最常见真菌的平均直径。一个特别的重点是分析微生物的大小分布是如何受到建筑框架（木制或混凝土）和建筑物中的水分损害的影响。这项研究是在32所学校建筑物进行的，这些建筑物根据建筑物技术调查分为潮湿损坏（索引）和未损坏（参考）学校。室内空气微生物的采样进行了使用级联冲击采样器，收集颗粒的六个阶段（范围从0.65到> 7微米），根据他们的空气动力学直径。木制和混凝土学校的真菌水平最高，大小范围为1.1-4.7 mum。然而，真菌的浓度在所有规模的类都高于木制学校比混凝土学校。在1.1-2.1妈妈的颗粒尺寸范围内，在混凝土学校，但不是在木制学校的尺寸分布的水分损害相关的差异。在一般情况下，总的活菌的平均几何平均直径（d（g，ave））是较小的木制学校比混凝土学校，和较小的指标学校的两种建筑类型比在他们的参考学校。然而，观察到的属的粒径的变化。没有差异的颗粒大小分布的可行的空气中的细菌被发现。我们的研究结果的依赖性的颗粒大小的建筑物类型和存在的水分损害提供了一个有趣的点，要考虑在评估复杂的问题，室内相关的生物气溶胶暴露。(C)2002爱思唯尔科技有限公司。保留所有权利。
Any risk assessment of moisture-damaged buildings requires an accurate characterization of the factors contributing to the human exposure. In this study, the size distributions of indoor air viable fungi and bacteria and average mean diameters of the most common fungi in school buildings were deter-mined. One special focus was to analyze how the microbial size distributions are affected by the building frame (either wooden or concrete) and moisture damage in the building. The study was, performed in 32 school buildings classified as moisture-damaged (index) and non-damaged (reference) schools according to technical building investigations. Sampling for indoor air microbes was carried out using a cascade impactor that collects particles on six stages (range from 0.65 to > 7 mum) according to their aerodynamic diameters. Both wooden and concrete schools had their highest fungal levels in the size range of 1.1-4.7 mum. However, the concentrations of fungi in all size classes were higher in wooden schools than in concrete schools. Moisture damage-associated differences in size distribution, in the particle size range of 1.1-2.1 mum, were seen in concrete schools but not in wooden schools. In general, the average geometric mean diameter (d(g,ave)) of total viable fungi was smaller in wooden schools than in concrete schools, and smaller in index schools of both construction types than in their reference schools. Variation in particle size, however, by genus was observed. No differences in particle size distributions of viable airborne bacteria were found. Our results on the dependency of the particle size on the building type and presence of moisture damage provide an interesting point to be considered in assessing the complex issue of indoor-related bioaerosol exposures. (C) 2002 Elsevier Science Ltd. All rights reserved.