Ozone interactions with human hair: Ozone uptake rates and product formation

Pandrangi, Lakshmi S.; Morrison, Glenn

doi:10.1016/j.atmosenv.2008.02.009

Cited by 97 publications

(138 citation statements)

References 30 publications

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“…The present results support recent studies (8)(9)(10)(11)37) demonstrating or inferring that humans are major sinks for ozone. The reaction probabilities reported for human hair (10) and clothing soiled with skin oil (11) are high, ranging from 0.5 × 10 −4 to 4 × 10 −4 .…”

Section: Resultssupporting

confidence: 82%

“…Such values are similar to values for 3-h average deposition velocities (0.37 to 0.46 cm s −1 ) recently reported for reactions between ozone and pieces of cotton, wool, and polyester fabrics soiled with skin oils (11). They are somewhat larger than values (0.20 and 0.23 cm s −1 ) reported for ozone and passengers in a simulated aircraft cabin (8), values (≈0.25 cm s −1 ) derived for ozone and human hair (10), and values (0.29 to 0.44 cm s −1 ) calculated from results presented in (37) at air exchange rates between 0.5 to 2.0 h −1 . The deposition velocity of ozone to the surface of the human envelope is sensitive to air movement around the body (10).…”

Section: Resultscontrasting

confidence: 46%

“…They are somewhat larger than values (0.20 and 0.23 cm s −1 ) reported for ozone and passengers in a simulated aircraft cabin (8), values (≈0.25 cm s −1 ) derived for ozone and human hair (10), and values (0.29 to 0.44 cm s −1 ) calculated from results presented in (37) at air exchange rates between 0.5 to 2.0 h −1 . The deposition velocity of ozone to the surface of the human envelope is sensitive to air movement around the body (10). Additionally, gas phase chemistry contributes to the overall ozone removal associated with human occupants.…”

Section: Resultscontrasting

confidence: 39%

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Reactions of ozone with human skin lipids: Sources of carbonyls, dicarbonyls, and hydroxycarbonyls in indoor air

Wisthaler

Weschler

2010

Proc. Natl. Acad. Sci. U.S.A.

374

544

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This study has used proton transfer reaction-mass spectrometry (PTR-MS) for direct air analyses of volatile products resulting from the reactions of ozone with human skin lipids. An initial series of small-scale in vitro and in vivo experiments were followed by experiments conducted with human subjects in a simulated office. The latter were conducted using realistic ozone mixing ratios (≈15 ppb with occupants present). Detected products included mono- and bifunctional compounds that contain carbonyl, carboxyl, or α -hydroxy ketone groups. Among these, three previously unreported dicarbonyls have been identified, and two previously unreported α -hydroxy ketones have been tentatively identified. The compounds detected in this study (excepting acetone) have been overlooked in surveys of indoor pollutants, reflecting the limitations of the analytical methods routinely used to monitor indoor air. The results are fully consistent with the Criegee mechanism for ozone reacting with squalene, the single most abundant unsaturated constituent of skin lipids, and several unsaturated fatty acid moieties in their free or esterified forms. Quantitative product analysis confirms that squalene is the major scavenger of ozone at the interface between room air and the human envelope. Reactions between ozone and human skin lipids reduce the mixing ratio of ozone in indoor air, but concomitantly increase the mixing ratios of volatile products and, presumably, skin surface concentrations of less volatile products. Some of the volatile products, especially the dicarbonyls, may be respiratory irritants. Some of the less volatile products may be skin irritants.

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Section: Resultssupporting

confidence: 82%

Section: Resultscontrasting

confidence: 46%

Section: Resultscontrasting

confidence: 39%

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Reactions of ozone with human skin lipids: Sources of carbonyls, dicarbonyls, and hydroxycarbonyls in indoor air

Wisthaler

Weschler

2010

Proc. Natl. Acad. Sci. U.S.A.

374

544

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“…The common sources of fatty acids in indoor environments include human skin oil and skin oil residue, furniture polishes, carpets, linoleum flooring, cooking, and vegetable oils and plant waxes, which may build up on ventilation ducts or filters (Weschler, 2006). Personal hygiene products may also contain unsaturated fatty acids (Pandrangi and Morrison, 2008). Fatty acids are larger molecules that tend to remain condensed on or sorb to surfaces and typically have one or two double bonds when unsaturated.…”

Section: Background: Indoor Air Quality and Ozone Chemistrymentioning

confidence: 99%

“…Skin oil contains unsaturated fatty acids and squalene, which are reactive with ozone (Nicolaides, 1974). The dominant, detected products of ozone-skin oil reactions include acetone, 6-methyl-5-hepten-2-one, geranyl acetone, 4-oxopentanal, nonanal, and decanal (Fruekilde et al, 1998;Pandrangi and Morrison, 2008).…”

Section: Introductionmentioning

confidence: 99%

Exposure-Relevant Ozone Chemistry in Occupied Spaces

Coleman

2009

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Ozone reacts with alkenes and other organic compounds that contain carboncarbon double bonds to form oxidation byproducts such as aldehydes, ketones, carboxylic acids, radicals, and secondary organic aerosol. Ozone-reactive species such as terpenes and unsaturated fatty acids are ubiquitous in the air and on surfaces in indoor environments. The most prevalent source of ozone indoors is ventilation of the space with ozone-containing ambient air, although some appliances that are used indoors also produce ozone. Reactions with surfaces are the ever-present and dominant sink of ozone and source of oxidation byproducts. Gas-phase ozone reactions must compete with the ventilation rate; they can be intermittently important ozone consumers and byproduct generators. Ozone-alkene reactions are chain-initiating because radicals are formed that 2 continue to react. The hydroxyl radical (OH) is a major secondary byproduct of ozonealkene chemistry, and it is a less-selective, faster reacting oxidizer than ozone. Thus, species that do not readily react with ozone, i.e. compounds that do not contain a carboncarbon double bond, may also be oxidized by the OH radical in ozone-initiated chemistry.In this dissertation, the chemical and physical factors that affect transformation of ozone into other airborne pollutants in occupied indoor environments are explored.Ozone-initiated reaction with, and byproduct formation from, reactive gas-phase and surface-phase species common to indoor settings were investigated in four studies.Byproduct types and formation rates were characterized in laboratory experiments.Byproduct concentrations and exposures were predicted in various indoor environments using experimental data and a model that predicts ozone transport and uptake and byproduct formation and fate.When both ozone and terpenes are present in indoor settings, terpenes can be a strong sink of ozone and source of gas-and particle-phase byproducts. I investigated secondary organic aerosol formation from the reaction of ozone with terpene-containing consumer products under conditions relevant for residential and commercial buildings.Gas-phase consumer product emissions and then ozone were introduced into a continuously ventilated 198-L chamber. At the onset of ozone addition, a nucleation event occurred, and nucleation and growth continued to occur as long as the reagents were introduced into the chamber. The particle formation and growth behavior in these experiments mimicked SOA dynamics from ozone-terpene reactions measured in actual buildings. The full particle size distribution was continuously monitored using an optical 3 particle counter and scanning mobility particle sizer. The resulting ultrafine and fine particle concentrations were in the range of 10 to >300 µg m -3 . Particle nucleation and growth dynamics under indoor conditions were characterized using the methods commonly applied to atmospheric nucleation events.Commercial passenger aircraft can encounter elevated stratospheric ozone levels at cruising altitude, and because...

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Indoor Surface Chemistry

Morrison¹

2021

Handbook of Indoor Air Quality

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Ozone interactions with human hair: Ozone uptake rates and product formation

Cited by 97 publications

References 30 publications

Reactions of ozone with human skin lipids: Sources of carbonyls, dicarbonyls, and hydroxycarbonyls in indoor air

Reactions of ozone with human skin lipids: Sources of carbonyls, dicarbonyls, and hydroxycarbonyls in indoor air

Exposure-Relevant Ozone Chemistry in Occupied Spaces

Indoor Surface Chemistry

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