Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2020.105039 |
The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments | |
Nirmal Kumar Gali, Stevanovic Svetlana, Peter Brimblecombe, Reece Alexander Brown, ... Ning Zhi | |
2020-05-16 | |
发表期刊 | Atmospheric Research
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出版年 | 2020 |
英文摘要 | The airborne particulate matter (PM) is known to cause adverse pulmonary and cardiovascular health effects. This study investigated the diurnal characteristics of PM induced PM-bound ROS from real time measurements in typical roadside and urban background sites in Hong Kong, and identified potential influencing factors to its variation in atmosphere. A nitroxide probe (BPEAnit) was employed in the real-time measurement of separate PM and gas phase induced reactive oxygen species (ROS) with a Particle-into-Liquid-Sampler. Measurements were carried in 2 h intervals over a 24 h period, and repeated for 6 days at each site. The total ROS (particle + gas phase) measurements resulted in multiple peaks at 08:00, 16:00 and 20:00 h time periods at background site, compared to non-intermittent decrease/increase trends at roadside. The total ROS generation was noted significantly higher by 50–100% (n = 6 p < .05) at roadside compared to the background site. While the contribution of PM2.5- and gas phase-induced ROS to the total ROS was on average 48 ± 8% and 52 ± 8% across 24 h at background site, the ratio of gas phase-induced ROS increased to 79 ± 4% and that of particle phase decreased to 21 ± 4% at roadside site. The total ROS well correlated with black carbon (BC) and particle-bound PAHs (p-PAHs), which are 4–8 fold and 10–20 fold higher at roadside than background. The ratio of p-PAHs/BC was high at roadside during peak hours compared to late nights suggesting fresh PM may have induced more total ROS generation compared to aged aerosols using this specific ROS probe. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/267529 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Nirmal Kumar Gali, Stevanovic Svetlana, Peter Brimblecombe, Reece Alexander Brown, ... Ning Zhi. The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments[J]. Atmospheric Research,2020. |
APA | Nirmal Kumar Gali, Stevanovic Svetlana, Peter Brimblecombe, Reece Alexander Brown, ... Ning Zhi.(2020).The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments.Atmospheric Research. |
MLA | Nirmal Kumar Gali, Stevanovic Svetlana, Peter Brimblecombe, Reece Alexander Brown, ... Ning Zhi."The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments".Atmospheric Research (2020). |
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