Sensitivity of PM10 oxidative potential to aerosol chemical composition at a Mediterranean urban site: ascorbic acid versus dithiothreitol measurements

IF 2.9 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Air Quality Atmosphere and Health Pub Date : 2023-03-13 DOI:10.1007/s11869-023-01332-1

Á. Clemente, J. Gil-Moltó, E. Yubero, N. Juárez, J. F. Nicolás, J. Crespo, N. Galindo

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引用次数: 2

Abstract

The oxidative potential (OP) of PM₁₀ daily samples collected at a traffic site in southeastern Spain during summer and winter was assessed by two acellular assays: the ascorbic acid (AA) and dithiothreitol (DTT) methods. Although PM₁₀ levels were similar during both periods, OP values (expressed in nmol min⁻¹ m⁻³) showed a defined seasonal trend. The AA activity was higher in summer than in winter, whereas the DTT reactivity exhibited an opposite seasonal pattern. Both assays were sensitive to different PM₁₀ components, as shown by the results of the linear correlation analysis. Moreover, the relationship between OP values and PM₁₀ chemical species was not the same during summer and winter, indicating that particle toxicity is associated with different sources during the warm and cold seasons. When OP values were expressed on a mass basis (nmol min⁻¹ µg⁻¹), lower correlation coefficients with PM₁₀ chemical species were generally obtained compared to volume-normalized activities. These outcomes suggest that only some specific components have a significant intrinsic oxidative potential.

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地中海城市地区PM10氧化潜能对气溶胶化学成分的敏感性：抗坏血酸与二硫苏糖醇的测量

摘要通过抗坏血酸（AA）和二硫苏糖醇（DTT）两种无细胞测定法，对西班牙东南部一个交通站点夏季和冬季采集的PM10日样本的氧化电位（OP）进行了评估。尽管这两个时期的PM10水平相似，但OP值（以nmol min−1 m−3表示）显示出明确的季节性趋势。AA活性在夏季高于冬季，而DTT活性表现出相反的季节模式。线性相关分析结果表明，两种测定方法对不同的PM10成分都很敏感。此外，在夏季和冬季，OP值与PM10化学物质之间的关系并不相同，这表明颗粒物毒性在温暖和寒冷季节与不同的来源有关。当OP值以质量为基础（nmol min−1µg−1）表示时，与体积归一化活性相比，通常获得较低的与PM10化学物质的相关系数。这些结果表明，只有某些特定成分具有显著的内在氧化潜力。

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来源期刊

Air Quality Atmosphere and Health ENVIRONMENTAL SCIENCES-

CiteScore

8.80

自引率

2.00%

发文量

146

审稿时长

>12 weeks

期刊介绍： Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health. It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes. International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals. Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements. This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.

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