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| Process and mechanism of complexation of dissolved organic matter(DOM) and Cu2+ in paddy soil |
| Received:November 16, 2022 |
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| KeyWord:dissolved organic matter (DOM);copper;binding process;paddy soil |
| Author Name | Affiliation | E-mail | | ZHOU Hao | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
Key Laboratory of Earth Surface Processes and Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China | | | LIN Yuesheng | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
Key Laboratory of Earth Surface Processes and Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China | | | FANG Fengman | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
Key Laboratory of Earth Surface Processes and Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China | | | YIN Li | School of Environment, Nanjing Normal University, Nanjing 210023, China | | | GE Lei | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China | | | CHEN Hui | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China | | | LI Shiyin | School of Environment, Nanjing Normal University, Nanjing 210023, China | | | YAO Youru | School of Geography and Tourism, Anhui Normal University, Wuhu 241003, China
Key Laboratory of Earth Surface Processes and Response in the Yangtze-Huaihe River Basin, Wuhu 241003, China | yaoyouru@ahnu.edu.cn |
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| Abstract: |
| The migration and transformation of Cu2+ in farmland soils have an important impact on biological health; however, the process and mechanism of binding Cu2+ to dissolved organic matter(DOM) in paddy soils are unclear. In this study, paddy soil DOM's particle size and spectral and structural characteristics, together with the process and mechanism of its binding with Cu2+, were investigated by dynamic light scattering, three-dimensional fluorescence, synchronized fluorescence, and X-ray photoelectron spectroscopy(XPS). The results showed that the SUVA254 of soil DOM was(3.25±0.07) L·(mg·m) -1, which is less than 4 L·(mg·m) -1. It had high hydrophilicity and low aromaticity, and the aromatic structure contained more oxygen-containing functional groups. DOM was mainly composed of fulvic acid-and humic acid-like components. The stability constaned of Cu2+ and humic acid-like components(lgKM=5.07) was higher than that of fulvic acid-like components(lgKM=4.81). The humic acid fractions in the DOM of the paddy field preferentially interacted with Cu2+. Particularly the phenolic, carboxyl, and phenolic hydroxyl groups of short-wave humic acid were more sensitive to the addition of Cu2+. In addition, the loose mesoporous structure, negative charge, and functional groups, such as hydroxyl, phenolic hydroxyl, and amino groups on the DOM surface, played a key role in the adsorption of Cu2+. |
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