Effects of Chemical Reactions on the Oxidative Potential of Humic Acid, a Model Compound of Atmospheric Humic-like Substances

被引：4

作者：

Koike, Yohei ^{[1
]}

Kameda, Takayuki ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

来源：

ATMOSPHERE | 2022年 / 13卷 / 06期

关键词：

atmospheric particulate matter; reactive oxygen species; oxidative potential; humic-like substances; dithiothreitol assay; ozone exposure; UV irradiation; Fourier transform infrared analysis; POLYCYCLIC AROMATIC-HYDROCARBONS; DITHIOTHREITOL DTT; ORGANIC-MATTER; ASCORBIC-ACID; HULIS; WATER; AEROSOLS; PM2.5; UV; ENHANCEMENT;

D O I：

10.3390/atmos13060976

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Atmospheric particulate matter (PM) contains various chemicals, some of which generate in vivo reactive oxygen species (ROS). Owing to their high reactivity and oxidation ability, ROS can cause various diseases. To understand how atmospheric PM affects human health, we must clarify the PM components having oxidative potential (OP) leading to ROS production. According to previous studies, OP is exhibited by humic-like substances (HULIS) in atmospheric PM. However, the OP-dependence of the chemical structures of HULIS has not been clarified. Therefore, in this study, humic acid (HA, a model HULIS material) was exposed to ozone and ultraviolet (UV) irradiation, and its OP and structures were evaluated before and after the reactions using dithiothreitol (DTT) assay and Fourier transform infrared (FT-IR), respectively. The OP of HA was more significantly increased by UV irradiation than by ozone exposure. FT-IR analysis showed an increased intensity of the C=O peak in the HA structure after UV irradiation, suggesting that the OP of HA was increased by a chemical change to a more quinone-like structure after irradiation.

引用

页数：10

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