Journal article
Concentrations of Volatile Methyl Siloxanes in New York City Reflect Emissions from Personal Care and Industrial Use
Environmental science & technology, Vol.58(20), pp.8835-8845
05/21/2024
DOI: 10.1021/acs.est.3c10752
PMCID: PMC11112754
PMID: 38722766
Appears in UI Libraries Support Open Access
Abstract
Volatile methyl siloxanes (VMS) are a group of organosilicon compounds of interest because of their potential health effects, their ability to form secondary organic aerosols, and their use as tracer compounds. VMS are emitted in the gas-phase from using consumer and personal care products, including deodorants, lotions, and hair conditioners. Because of this emission route, airborne concentrations are expected to increase with population density, although there are few studies in large urban centers. Here, we report summertime concentrations and daily variations of VMS congeners measured in New York City. Median concentrations of the 6 studied congeners, D3 (20 ng m), D4 (57 ng m), D5 (230 ng m), D6 (11 ng m), L5 (2.5 ng m), and L7 (1.3 ng m) are among the highest reported outdoor concentrations in the literature to date. Average congener ratios of D5:D4 and D5:D6 were consistent with previously reported emissions ratios, suggesting that concentrations were dominated by local emissions. Measured concentrations agree with previously published results from a Community Multiscale Air Quality model and support commonly accepted emissions rates for D4, D5, and D6 of 32.8, 135, and 6.1 mg per capita per day. Concentrations of D4, D5, D6, L5, and L7 and total VMS were significantly lower during the day than during the night, consistent with daytime oxidation reactivity. Concentrations of D3 did not show the same diurnal trend but exhibited a strong directional dependence, suggesting that it may be emitted by industrial point sources in the area rather than personal care product use. Concentrations of all congeners had large temporal variations but showed relatively weak relationships with wind speed, temperature, and mixing height.
Details
- Title: Subtitle
- Concentrations of Volatile Methyl Siloxanes in New York City Reflect Emissions from Personal Care and Industrial Use
- Creators
- Christopher E Brunet - University of IowaRachel F Marek - University of IowaCharles O Stanier - University of IowaKeri C Hornbuckle - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.58(20), pp.8835-8845
- Publisher
- American Chemical Society
- DOI
- 10.1021/acs.est.3c10752
- PMID
- 38722766
- PMCID
- PMC11112754
- eISSN
- 1520-5851
- Language
- English
- Electronic publication date
- 05/09/2024
- Date published
- 05/21/2024
- Academic Unit
- Civil and Environmental Engineering; Occupational and Environmental Health; IIHR--Hydroscience and Engineering; Interdisciplinary Graduate Program in Human Toxicology; Chemical and Biochemical Engineering
- Record Identifier
- 9984626030102771
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