Oxidative potential of urban PM2.5 in relation to chemical composition: Importance of fossil driven sources

IF 10.3 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environment International Pub Date : 2025-04-01 DOI:10.1016/j.envint.2025.109424

Joo-Ae Kim , Seulki Jeong , Saehee Lim , Yongjoo Choi , Hyomin Kim , Meehye Lee

{"title":"Oxidative potential of urban PM2.5 in relation to chemical composition: Importance of fossil driven sources","authors":"Joo-Ae Kim , Seulki Jeong , Saehee Lim , Yongjoo Choi , Hyomin Kim , Meehye Lee","doi":"10.1016/j.envint.2025.109424","DOIUrl":null,"url":null,"abstract":"<div><div>For a comprehensive evaluation of the key factors determining the oxidative potential (OP) of PM2.5, 75 samples of PM2.5 were collected in urban Seoul, South Korea, during 2019–2021, and dithiothreitol consumption (DTTv) was measured using a DTT assay, coupled with an analysis of major constituents and stable isotope ratios of PM2.5. For the entire sample set, the mean DTTv value was 0.58 ± 0.48 nmol m−3 min−1 for PM2.5 of 29.1 ± 12.2. DTTv exhibited a general dependence on of PM2.5 concentrations and major constituents, including NO4+, SO42-, NH4+, and organic carbon (OC). Specifically, NO3– and NH4+ demonstrated the most robust correlation with DTTv during the cold season, whereas only elemental carbon (EC) showed a significant correlation with DTTv in the warm season. The δ13C of total carbon (TC) and δ15N of total nitrogen (TN) displayed an inverse correlation concerning DTT activities, suggesting the significant contribution from solid fossil fuels and biomass burning to the oxidative potential of PM2.5, particularly during the cold season when PM2.5 was notably high. In contrast, vehicle emissions were found to influence DTTv even at low PM2.5 levels in warm seasons. This study provides insights into the intricate dynamics influencing the oxidative potential of PM2.5.</div></div>","PeriodicalId":308,"journal":{"name":"Environment International","volume":"198 ","pages":"Article 109424"},"PeriodicalIF":10.3000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environment International","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0160412025001758","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

For a comprehensive evaluation of the key factors determining the oxidative potential (OP) of PM_2.5, 75 samples of PM_2.5 were collected in urban Seoul, South Korea, during 2019–2021, and dithiothreitol consumption (DTTv) was measured using a DTT assay, coupled with an analysis of major constituents and stable isotope ratios of PM_2.5. For the entire sample set, the mean DTTv value was 0.58 ± 0.48 nmol m⁻³ min⁻¹ for PM_2.5 of 29.1 ± 12.2. DTTv exhibited a general dependence on of PM_2.5 concentrations and major constituents, including NO₄⁺, SO₄^2-, NH₄⁺, and organic carbon (OC). Specifically, NO₃^– and NH₄⁺ demonstrated the most robust correlation with DTTv during the cold season, whereas only elemental carbon (EC) showed a significant correlation with DTTv in the warm season. The δ¹³C of total carbon (TC) and δ¹⁵N of total nitrogen (TN) displayed an inverse correlation concerning DTT activities, suggesting the significant contribution from solid fossil fuels and biomass burning to the oxidative potential of PM_2.5, particularly during the cold season when PM_2.5 was notably high. In contrast, vehicle emissions were found to influence DTTv even at low PM_2.5 levels in warm seasons. This study provides insights into the intricate dynamics influencing the oxidative potential of PM_2.5.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Environment International 环境科学-环境科学

CiteScore

21.90

自引率

3.40%

发文量

734

审稿时长

2.8 months

期刊介绍： Environmental Health publishes manuscripts focusing on critical aspects of environmental and occupational medicine, including studies in toxicology and epidemiology, to illuminate the human health implications of exposure to environmental hazards. The journal adopts an open-access model and practices open peer review. It caters to scientists and practitioners across all environmental science domains, directly or indirectly impacting human health and well-being. With a commitment to enhancing the prevention of environmentally-related health risks, Environmental Health serves as a public health journal for the community and scientists engaged in matters of public health significance concerning the environment.