| 李希媛,滕辉,赵玉杰,陈春梅,余光辉,管冬兴.薄膜扩散梯度（DGT）技术在环境微界面物质运移过程研究中的应用[J].农业环境科学学报,2020,39(8):1649-1660. |
| 薄膜扩散梯度（DGT）技术在环境微界面物质运移过程研究中的应用 |
| Application of diffusive gradients in thin-films（DGT）technique in studying solute transport processes across environmental micro-interfaces |
| 投稿时间：2020-01-23 |
| DOI：10.11654/jaes.2020-0097 |
| 中文关键词: 化学成像技术 营养盐 污染物 沉积物-水界面 植物根际 时空高分辨 |
| 英文关键词: chemical imaging techniques nutrients contaminants sediment-water interface plant rhizosphere spatio-temporal high resolution |
| 基金项目:农业农村部农产品质量安全环境因子控制重点实验室开放基金项目（2019hjyzkfkt001）；国家自然科学基金项目（41807353） |
|
| 摘要点击次数: 2738 |
| 全文下载次数: 2638 |
| 中文摘要: |
| 土壤、沉积物、水体和生物体之间的接触和作用形成了多种环境微界面。这些环境微界面是物质迁移转化的重要场所，而高度时空异质性的界面特征使得对其中化学反应信息的捕捉变得极其复杂且困难。薄膜梯度扩散（DGT）技术以其原位测量元素生物有效态和高空间分辨率等优势，适用于研究化学异质性的界面过程。本文系统总结了DGT技术在环境微界面的物质运移过程研究中的应用现状，包括以下3方面内容：一是一维物质浓度测定；二是二维化学分布成像；三是与薄膜扩散平衡技术（DET）、平衡式孔隙水采样器（Peeper）和平面光极（PO）等技术联用同步获取多种溶质分布信息。现有研究证据表明，DGT适合在亚毫米（几十至几百微米）至毫米尺度研究环境微界面营养盐和污染物运移的生物地球化学过程，并可与其他化学成像技术结合研究物质跨界面运移的驱动因子和动力学特征。最后，在DGT技术发展与应用场景扩展等方面提出了几点展望。 |
| 英文摘要: |
| The contact and interaction between media/entities of soils, sediments, water, and organisms form a variety of environmental micro-interfaces. These environmental micro-interfaces are important sites of chemical migration and transformation. The highly spatiotemporal heterogeneity characteristics of the interfaces make them extremely complex, complicating the capture of chemical reaction information. The diffusive gradients in thin-films(DGT)technique is suitable for the study of chemical heterogeneity due to its advantages in measurements of element/chemical availability in-situ and at high spatial resolution. This review systematically summarized the applications of DGT in studying chemical transport processes across environmental micro-interfaces, including the following three aspects:one-dimensional concentration measurement; two-dimensional imaging of chemical distributions; and simultaneous acquisition of various solute distribution information by combining DGT with diffusive equilibrium in thin-films(DET), multichambered equilibrium dialysis (Peeper), and planar optode(PO) techniques. The existing research evidence shows that DGT is a robust tool in studying the biogeochemical processes of nutrients and contaminants across environmental micro-interfaces at the submillimeter(tens to hundreds of microns)to millimeter scale. Moreover, it can be combined with other chemical imaging techniques to study the driving factors and dynamic characteristics of solute transport across interfaces. To this end, some prospects were put forward regarding DGT technology development and application scenario expansion. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
