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Extraction of Dust Collected in HVAC Filters for Quantitative Filter Forensics
Aerosol Science and Technology ( IF 5.2 ) Pub Date : 2020-06-19 , DOI: 10.1080/02786826.2020.1774492
Alireza Mahdavi 1 , Jeffrey A. Siegel 1, 2
Affiliation  

Abstract The analysis of dust collected on the filters installed in the heating, ventilation, and air-conditioning (HVAC) systems, filter forensics, is a useful approach to explore concentration, size distribution, and composition of indoor particles. The extraction of dust from filters represents one of the biggest challenges to obtain accurate results from filter forensics. Although vacuuming is one of the most common dust extraction techniques, it is unclear how efficient it is and whether it provides a representative sample in terms of particle size. In this article, we used a high-capacity vacuum sampler to extract dust from 20 filters artificially loaded with well-characterized test dust as well as from 41 filters naturally loaded in residential HVAC systems. After all extractions, we recovered 0.1–5.5 g and 0.02–11.4 g of dust from the artificially and naturally loaded filters, respectively. These ranges were equivalent to 11.3–52.2% and 1.8–72.9% recovery efficiency, the ratio of dust recovered to the dust loaded in the filters. Multiple extractions were found to be an effective strategy to add to the recovery to enable filter forensics for the detection of multiple analytes. The recovered samples were slightly over-representative of particles greater than 10 µm. Therefore, caution should be taken when applying filter forensics for studying contaminants associated with smaller particles. Copyright © 2020 American Association for Aerosol Research

中文翻译:

提取 HVAC 过滤器中收集的灰尘,用于定量过滤器取证

摘要 对安装在供暖、通风和空调 (HVAC) 系统中的过滤器上收集的灰尘进行分析,即过滤取证,是探索室内颗粒的浓度、粒度分布和组成的有用方法。从过滤器中提取灰尘是从过滤器取证中获得准确结果的最大挑战之一。虽然抽真空是最常见的除尘技术之一,但目前尚不清楚它的效率如何以及它是否提供了具有代表性的颗粒尺寸样本。在本文中,我们使用大容量真空采样器从 20 个人工装载的过滤器中提取灰尘,过滤器中装有充分表征的测试灰尘,以及从住宅 HVAC 系统中自然装载的 41 个过滤器中提取灰尘。在所有提取之后,我们回收了 0.1–5.5 g 和 0.02–11。分别来自人工和自然负载过滤器的 4 g 灰尘。这些范围相当于 11.3-52.2% 和 1.8-72.9% 的回收效率,即回收的粉尘与过滤器中装载的粉尘的比率。发现多次提取是一种有效的策略,可以增加回收率,使过滤法医学能够检测多种分析物。回收的样品对大于 10 µm 的颗粒的代表性略高。因此,在应用过滤取证来研究与较小颗粒相关的污染物时应谨慎。版权所有 © 2020 美国气溶胶研究协会 发现多次提取是一种有效的策略,可以增加回收率,使过滤法医学能够检测多种分析物。回收的样品对大于 10 µm 的颗粒的代表性略高。因此,在应用过滤取证来研究与较小颗粒相关的污染物时应谨慎。版权所有 © 2020 美国气溶胶研究协会 发现多次提取是一种有效的策略,可以增加回收率,使过滤法医学能够检测多种分析物。回收的样品对大于 10 µm 的颗粒的代表性略高。因此,在应用过滤取证来研究与较小颗粒相关的污染物时应谨慎。版权所有 © 2020 美国气溶胶研究协会
更新日期:2020-06-19
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