Biological and metal contaminants in HVAC filter dust.(heating, ventilation and air conditioning)(Report): An article from: ASHRAE Transactions
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ISBN / ASINB00371OVJU
ISBN-13978B00371OVJ7
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This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on July 1, 2009. The length of the article is 6401 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: Recently, the interaction between particles retained on HVAC filters and indoor air quality has gained more attention due to their possible relationship to irritation, health outcomes, and odors. This paper focuses on microbial contaminants and metals captured on HVAC filters in nine residential and light-commercial buildings. Culturable fungi and bacteria populations captured in the dust were quantified using standard spread plate methods and heavy metal (Pb, As, Cd) concentrations were determined by atomic absorption spectroscopy. Culturable fungal and fungal spore concentrations ranged from [10.sup.4] to [10.sup.6] and from [10.sup.2] to [10.sup.3] CFU/g, respectively, while culturable bacteria and bacterial spore concentrations ranged from [10.sup.5]-[10.sup.7] and [10.sup.3]-[10.sup.5] CFU/g, respectively. Microbial concentrations were consistent across filters having different efficiencies with median concentrations within one order of magnitude. Heavy metal concentrations were as high as 29 [micro]g/g for lead, 6 [micro]g/g for cadmium, and 7 [micro]g/g for arsenic. Variations observed in the metal concentrations between different dust samples may be due to particle size differences related to different filter efficiencies and indoor sources. This investigation provides insight into possible metal sources and concentrations of biological and heavy metal contaminants present in indoor environments.
Citation Details
Title: Biological and metal contaminants in HVAC filter dust.(heating, ventilation and air conditioning)(Report)
Author: Federico Noris
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 484(8)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: Recently, the interaction between particles retained on HVAC filters and indoor air quality has gained more attention due to their possible relationship to irritation, health outcomes, and odors. This paper focuses on microbial contaminants and metals captured on HVAC filters in nine residential and light-commercial buildings. Culturable fungi and bacteria populations captured in the dust were quantified using standard spread plate methods and heavy metal (Pb, As, Cd) concentrations were determined by atomic absorption spectroscopy. Culturable fungal and fungal spore concentrations ranged from [10.sup.4] to [10.sup.6] and from [10.sup.2] to [10.sup.3] CFU/g, respectively, while culturable bacteria and bacterial spore concentrations ranged from [10.sup.5]-[10.sup.7] and [10.sup.3]-[10.sup.5] CFU/g, respectively. Microbial concentrations were consistent across filters having different efficiencies with median concentrations within one order of magnitude. Heavy metal concentrations were as high as 29 [micro]g/g for lead, 6 [micro]g/g for cadmium, and 7 [micro]g/g for arsenic. Variations observed in the metal concentrations between different dust samples may be due to particle size differences related to different filter efficiencies and indoor sources. This investigation provides insight into possible metal sources and concentrations of biological and heavy metal contaminants present in indoor environments.
Citation Details
Title: Biological and metal contaminants in HVAC filter dust.(heating, ventilation and air conditioning)(Report)
Author: Federico Noris
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 484(8)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
