Seasonal and spatial variation in dithiothreitol (DTT) activity of quasi-ultrafine particles in the Los Angeles Basin and its association with chemical species

Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Arian SaffariConstantinos Sioutas

Abstract

A year-long sampling campaign of quasi-ultrafine particles (dp < 0.25 μm) was conducted at 10 distinct sites representing source, urban and/or near-freeway, rural receptor and desert locations across the Los Angeles air basin. Redox activity of the PM samples was measured by means of the Dithiothreitol (DTT) assay and detailed chemical analysis was performed to measure the concentrations of chemical species. DTT activity per unit air volume and unit PM mass (expressed in nmol min(-1) m(-3) and nmol/min/μg PM, respectively) showed similar trends across sites and seasons. DTT activity was generally higher during cold seasons (winter and fall) compared to warm seasons (summer and spring). Noticeable peaks were observed at urban near-freeway locations representing "source" sites impacted by fresh traffic emissions. Regression analysis indicated strong association (R > 0.7) between the DTT activity and the concentrations of carbonaceous species (OC, EC, WSOC and WIOC) across all seasons and strong winter-time correlations with organic tracers of primary vehicular emissions including polycyclic aromatic hydrocarbons (PAHs), alkanes, hopanes and steranes. Strong correlations were also observed, particularly during winter, between DTT ...Continue Reading

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Citations

Jan 10, 2016·The Science of the Total Environment·F HedayatZ D Ristovski
Jan 1, 2015·AIMS Environmental Science·Nicholas WoodwardTodd E Morgan
Jun 18, 2015·The Science of the Total Environment·Constantini SamaraApostolos Kelessis
Jan 15, 2014·Environmental Pollution·Sina HasheminassabConstantinos Sioutas
Apr 4, 2015·Environmental Health Perspectives·Aileen YangGerard Hoek
Apr 7, 2017·Journal of Cancer Prevention·Hyo Jeong KimYoung Rok Seo
Sep 7, 2017·The Science of the Total Environment·Farimah ShirmohammadiConstantinos Sioutas
May 31, 2014·Environmental Science & Technology·Arian SaffariConstantinos Sioutas
May 16, 2019·Environmental Science & Technology·Jenny P S WongRodney J Weber
Nov 8, 2017·Environmental Science & Technology·Manabu ShiraiwaKei Sato
Jan 31, 2019·Environmental Science & Technology·Collin BrehmerEllison Carter
Sep 1, 2021·Atmospheric Chemistry and Physics·Steven J CampbellMarkus Kalberer

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