Cyclic siloxanes in air, including identification of high levels in Chicago and distinct diurnal variation

Rachel A Yucuis; Charles O Stanier; Keri C Hornbuckle

doi:10.1016/j.chemosphere.2013.02.051

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Cyclic siloxanes in air, including identification of high levels in Chicago and distinct diurnal variation

Journal article

Peer reviewed

Cyclic siloxanes in air, including identification of high levels in Chicago and distinct diurnal variation

Rachel A Yucuis, Charles O Stanier and Keri C Hornbuckle

Chemosphere, Vol.92(8), pp.905-910

08/2013

DOI: 10.1016/j.chemosphere.2013.02.051

PMCID: PMC3975597

PMID: 23541357

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https://www.ncbi.nlm.nih.gov/pmc/articles/3975597View

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Abstract

[Display omitted] •Indoor and outdoor air concentrations of cyclic siloxanes were measured in rural, urban and indoor air.•D5 was the dominant siloxane detected in indoor and outdoor air.•A diurnal trend in siloxane concentrations in Chicago was identified.•Concentrations of cyclic siloxanes are higher during night hours than in day in urban air.•The relative magnitudes of D4, D5, and D6 differ between indoor and outdoor air. The organosilicon compounds octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) are high production volume chemicals that are widely used in household goods and personal care products. Due to their prevalence and chemical characteristics, cyclic siloxanes are being assessed as possible persistent organic pollutants. D4, D5, and D6 were measured in indoor and outdoor air to quantify and compare siloxane concentrations and compound ratios depending on location type. Indoor air samples had a median concentration of 2200ngm−3 for the sum of D4, D5, and D6. Outdoor sampling locations included downtown Chicago, Cedar Rapids, IA, and West Branch, IA, and had median sum siloxane levels of 280, 73, and 29ngm−3 respectively. A diurnal trend is apparent in the samples taken in downtown Chicago. Nighttime samples had a median 2.7 times higher on average than daytime samples, which is due, in part, to the fluctuations of the planetary boundary layer. D5 was the dominant siloxane in both indoor and outdoor air. Ratios of D5 to D4 averaged 91 and 3.2 for indoor and outdoor air respectively.

Personal care products

D4, D5, and D6

Cyclic siloxane

Chicago

Indoor air

Details

Title: Subtitle: Cyclic siloxanes in air, including identification of high levels in Chicago and distinct diurnal variation
Creators: Rachel A Yucuis - Department of Civil & Environmental Engineering, IIHR–Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242, USA
Charles O Stanier - Department of Chemical and Biochemical Engineering, IIHR Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242, USA
Keri C Hornbuckle - Department of Civil & Environmental Engineering, IIHR–Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242, USA
Resource Type: Journal article
Publication Details: Chemosphere, Vol.92(8), pp.905-910
DOI: 10.1016/j.chemosphere.2013.02.051
PMID: 23541357
PMCID: PMC3975597
NLM abbreviation: Chemosphere
ISSN: 0045-6535
eISSN: 1879-1298
Publisher: Elsevier Ltd
Language: English
Date published: 08/2013
Academic Unit: Civil and Environmental Engineering; Occupational and Environmental Health; Chemical and Biochemical Engineering; Iowa Superfund Research Program
Record Identifier: 9983806398802771

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