Photogeneration and steady-state concentration of hydroxyl radical in river and lake waters along middle-lower Yangtze region, China
文献类型：期刊论文
| 作者 | Xu, Huacheng; Li, Yani; Liu, Jin; Du, Haiyan; Du, Yingxun; Su, Yaling; Jiang, Helong |
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2020 |
| 卷号 | 176 |
| 英文摘要 | Hydroxyl radical (HO center dot) in natural waters plays a critical role in contaminant transformation and ecosystem health. In this study, the photogeneration and steady-state concentration of HO center dot in different aquatic environments (e.g., river and lake) along the middle-lower Yangtze region, China, were evaluated. The results showed that, compared to lake samples, the river waters were characterized by lower HO center dot photoformation rate (R-HO center dot) (5.10-11.69 x 10(-11) vs. 1.10-1.82 x 10(-10) M s(-1)) and steady-state HO center dot concentration ([HO center dot]) (1.76-3.11 x 10(-17) vs. 2.50-10.33 x 10(-17) M). The contribution of nitrate and nitrite to the total R-HO center dot in river waters was generally higher than that in lake waters, and photolysis of nitrite exhibited contributions 1-2 times higher than those of nitrate (0-25% vs. 0-9%) irrespective of sample types. As a result, the photosensitization by chromophoric dissolved organic matter (CDOM) contributed more than 70% of the total R-HO center dot for all samples except for River Ganjiang. [HO center dot] among all samples was positively correlated with dissolved organic carbon (DOC) concentration, and the DOC-normalized [HO center dot] was further related to the physicochemical properties of CDOM samples (e.g., aromaticity, humification, and molecular weight). The humic-like aromatic substances with low molecular weight were the controlling factors influencing [HO center dot] in the studied surface waters. The results contributed to a deeper understanding of behaviors and fate of aquatic DOMs in terms of HO center dot formation and contaminant attenuation. (C) 2020 Elsevier Ltd. All rights reserved. |
| 源URL | [http://159.226.73.51/handle/332005/20175]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Xu, Huacheng,Li, Yani,Liu, Jin,et al. Photogeneration and steady-state concentration of hydroxyl radical in river and lake waters along middle-lower Yangtze region, China[J]. WATER RESEARCH,2020,176. |
| APA | Xu, Huacheng.,Li, Yani.,Liu, Jin.,Du, Haiyan.,Du, Yingxun.,...&Jiang, Helong.(2020).Photogeneration and steady-state concentration of hydroxyl radical in river and lake waters along middle-lower Yangtze region, China.WATER RESEARCH,176. |
| MLA | Xu, Huacheng,et al."Photogeneration and steady-state concentration of hydroxyl radical in river and lake waters along middle-lower Yangtze region, China".WATER RESEARCH 176(2020). |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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