The Rate of Ozone Uptake on Carpets: Experimental Studies

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• 作者：Glenn C. Morrison and William W Nazaroff
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：December 1, 2000
• 年：2000
• 卷：34
• 期：23
• 页码：4963 - 4968
• 全文大小：84K
• 年卷期：v.34,no.23(December 1, 2000)
• ISSN：1520-5851

文摘

Ozone can react with surfaces, reducing indoor concentrations. Carpets may be important ozone sinks becauseof their high surface area. We conducted laboratoryexperiments to measure ozone uptake on four samples ofwhole carpet and on the corresponding carpet fibersand carpet backing. Results were parametrized in termsof reaction probability, defined as the rate of ozone loss ona surface normalized by the rate of ozone-surfacecollisions. For whole carpet and carpet-backing samples,we found the apparent reaction probability to be of magnitude10^-5 to 10^-4. These results are referenced to the floorarea that would be covered by the carpet, rather than tothe total surface area of the carpet and its fibers. Reactionprobabilities of the order of 10^-7 to 10^-6 were measuredon carpet fibers, referenced to total estimated fiber area. Theresults indicate that carpet is of comparable significanceto painted walls in scavenging ozone from indoor air.All samples tested exhibited aging, such that the rate ofozone uptake diminished with increasing cumulative exposure.Although reactions on carpeting can reduce humanexposure to ozone, we caution that the reaction productsmay include volatile carbonyls that have low odor orirritation thresholds.