Online Measurements during Simulated Atmospheric Aging Track the Strongly Increasing Oxidative Potential of Complex Combustion Aerosols Relative to Their Primary Emissions DOI
Rico K. Y. Cheung, Jun Zhang, Tiantian Wang

et al.

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 12(1), P. 64 - 72

Published: Dec. 10, 2024

Oxidative potential (OP) is increasingly recognized as a more health-relevant metric than particulate matter (PM) mass concentration because of its response to varying chemical compositions. Given the limited research on OP complex combustion aerosols, effects aging processes their remain underexplored. We used online instruments track evolution [via dithiothreitol (DTT) assays] during wood burning and coal emissions by hydroxyl-radical-driven photooxidation dark ozonolysis. observed very substantial increases in intrinsic (OPmDTT) aerosols (e.g., OPmDTT up 100 pmol min–1 μg–1 for OH-aged emissions) within 1 day equivalent aging. Further analysis relation degree oxidation revealed generalizing carbonaceous with average carbon state OS¯c values ranging from −1.5 −0.5 assuming they have constant value ∼10 ± 6 μg–1. Additionally, we uncovered strong dependency both source/precursor pathway above ∼−0.5. OH was identified an exceptionally efficient generating highly oxidized, multifunctionalized, DTT-active products, particularly emissions.

Language: Английский

The Influence of Different Protocols on the Application of the Dithiothreitol Assay in Determining the Oxidative Potential of Ambient Particles DOI Creative Commons
Maja Jovanović, Marija Živković,

Bojana Petrović

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 113 - 113

Published: Jan. 30, 2025

Environmental particulate matter (PM) exposure has been widely recognized for its significant adverse effects on human health. Monitoring PM levels is one of the essential parameters air quality assessment. However, mass concentration alone does not sufficiently explain toxicological impacts and This study highlights importance oxidative potential (OP) as a promising metric evaluating toxicity. It focuses standardizing dithiothreitol (DTT) assay tool OP measurement. In order to investigate impact various extraction techniques, reagent concentrations, conditions, four previously established protocols were tested without modification, while novel protocol was introduced based an extensive literature review. Results revealed strong positive correlations between new most protocols. These findings highlight significance in advancing development standardized methodologies applying DTT demonstrating reliability relevance. While developing involves addressing numerous parameters—from filter application—this research provides solid base achieving consistency measurements overcoming this critical issue.

Language: Английский

Citations

0
A superhydrophobic and heat-resistant PAN/PSU/PTFE composite nanofiber membrane for high-efficiency PM1.0 and PM2.5 filtration DOI Creative Commons
Rizky Aflaha,

Chlara Naren Maharani,

Linda Ardita Putri

et al.

Materials Advances, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This study developed a PAN/PSU/PTFE nanofiber membrane using electrospinning, demonstrating high filtration efficiency for PM 1.0 and 2.5 with thermal stability up to 300 °C consistent performance 4 months.

Language: Английский

Citations

1
Online Measurements during Simulated Atmospheric Aging Track the Strongly Increasing Oxidative Potential of Complex Combustion Aerosols Relative to Their Primary Emissions DOI
Rico K. Y. Cheung, Jun Zhang, Tiantian Wang

et al.

Environmental Science & Technology Letters, Journal Year: 2024, Volume and Issue: 12(1), P. 64 - 72

Published: Dec. 10, 2024

Oxidative potential (OP) is increasingly recognized as a more health-relevant metric than particulate matter (PM) mass concentration because of its response to varying chemical compositions. Given the limited research on OP complex combustion aerosols, effects aging processes their remain underexplored. We used online instruments track evolution [via dithiothreitol (DTT) assays] during wood burning and coal emissions by hydroxyl-radical-driven photooxidation dark ozonolysis. observed very substantial increases in intrinsic (OPmDTT) aerosols (e.g., OPmDTT up 100 pmol min–1 μg–1 for OH-aged emissions) within 1 day equivalent aging. Further analysis relation degree oxidation revealed generalizing carbonaceous with average carbon state OS¯c values ranging from −1.5 −0.5 assuming they have constant value ∼10 ± 6 μg–1. Additionally, we uncovered strong dependency both source/precursor pathway above ∼−0.5. OH was identified an exceptionally efficient generating highly oxidized, multifunctionalized, DTT-active products, particularly emissions.

Language: Английский

Citations

0