Iron and Copper Alter the Oxidative Potential of Secondary Organic Aerosol: Insights from Online Measurements and Model Development

Battist Utinger; Alexandre Barth; Suzanne E. Paulson

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Iron and Copper Alter the Oxidative Potential of Secondary Organic Aerosol: Insights from Online Measurements and Model Development

机译：Iron and Copper Alter the Oxidative Potential of Secondary Organic Aerosol: Insights from Online Measurements and Model Development

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The oxidative potential (OP) of particulate matter has been widely suggested as a key metric for describing atmospheric particle toxicity. Secondary organic aerosol (SOA) and redox-active transition metals, such as iron and copper, are key drivers of particle OP. However, their relative contributions to OP, as well as the influence of metal—organic interactions and particulate chemistry on OP, remains uncertain. In this work, we simultaneously deploy two novel online instruments for the first time, providing robust quantification of particle OP. We utilize online AA (OP) and 2,7- dichlorofluoroscein (ROSDCFH) methods to investigate the influence of Fe(II) and Cu(II) on the OP of secondary organic aerosol (SOA). In addition, we quantify the OH production (OPOH) from these particle mixtures. We observe a range of synergistic and antagonistic interactions when Fe(II) and Cu(II) are mixed with representative biogenic (-pinene) and anthropogenic (naphthalene) SOA A newly developed kinetic model revealed key reactions among SOA components, transition metals, and ascorbate, influencing OP.

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《Environmental Science & Technology: ES&T》 |2023年第36期|13546-13558|共13页
作者
Battist Utinger; Alexandre Barth; Suzanne E. Paulson;
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作者单位

Department of Environmental Sciences, University of Basel, 4057 Basel, Switzerland;

Department of Atmospheric and Oceanic Sciences, University of California at Los Angeles, Los Angeles, California 90095, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
aerosol particles; oxidative potential; secondary organic aerosol; reactive oxygen species; ascorbic acid; DCFH; hydroxyl radicals;

Iron and Copper Alter the Oxidative Potential of Secondary Organic Aerosol: Insights from Online Measurements and Model Development

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