| 周浩,林跃胜,方凤满,阴俐,葛磊,陈辉,李时银,姚有如.水稻土溶解性有机质与Cu2+结合过程及机制研究[J].农业环境科学学报,2023,42(5):1071-1081. |
| 水稻土溶解性有机质与Cu2+结合过程及机制研究 |
| Process and mechanism of complexation of dissolved organic matter(DOM) and Cu2+ in paddy soil |
| 投稿时间：2022-11-16 |
| DOI：10.11654/jaes.2022-1172 |
| 中文关键词: 溶解性有机质 铜 结合过程 水稻土 |
| 英文关键词: dissolved organic matter (DOM) copper binding process paddy soil |
| 基金项目:国家自然科学基金项目（41977402，42207454）；芜湖市应用基础研究项目（2022jc09） |
| 作者 | 单位 | E-mail | | 周浩 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003
江淮流域地表过程与区域响应安徽省重点实验室, 安徽 芜湖 241003 | | | 林跃胜 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003
江淮流域地表过程与区域响应安徽省重点实验室, 安徽 芜湖 241003 | | | 方凤满 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003
江淮流域地表过程与区域响应安徽省重点实验室, 安徽 芜湖 241003 | | | 阴俐 | 南京师范大学环境学院, 南京 210023 | | | 葛磊 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003 | | | 陈辉 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003 | | | 李时银 | 南京师范大学环境学院, 南京 210023 | | | 姚有如 | 安徽师范大学地理与旅游学院, 安徽 芜湖 241003
江淮流域地表过程与区域响应安徽省重点实验室, 安徽 芜湖 241003 | yaoyouru@ahnu.edu.cn |
|
| 摘要点击次数: 1074 |
| 全文下载次数: 810 |
| 中文摘要: |
| 农田土壤中Cu2+的迁移转化对生物体健康产生重要影响，然而，水稻土中的溶解性有机质（DOM）与Cu2+的结合过程和机制尚不清楚。本研究通过动态光散射、三维荧光、同步荧光以及X射线光电子能谱（XPS）等方法，探究水稻土中DOM的粒径、光谱和结构特征及其与Cu2+的结合过程及机制。结果表明，土壤DOM的SUVA254值为（3.25±0.07）L·（mg·m）-1，低于4 L·（mg·m）-1，其亲水性较高同时芳香性偏低，并且其芳香结构中含有较多的含氧官能团。水稻土DOM的构成以类富里酸和类腐植酸为主，Cu2+与类腐植酸络合稳定常数（lgKM=5.07）高于类富里酸（lgKM=4.81）。表明稻田土壤DOM中的类腐植酸组分与Cu2+优先结合，尤其以短波类腐植酸中的酚基、羟基和酚羟基等含氧基团对Cu2+的添加表现得更为敏感。另外，DOM表面疏松的介孔结构、负电荷和羟基、酚羟基以及氨基等官能团对Cu2+吸附起到关键作用。 |
| 英文摘要: |
| 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+. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
