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| Application of diffusive gradients in thin-films（DGT）technique in studying solute transport processes across environmental micro-interfaces |
| Received:January 23, 2020 |
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| KeyWord:chemical imaging techniques;nutrients;contaminants;sediment-water interface;plant rhizosphere;spatio-temporal high resolution |
| Author Name | Affiliation | E-mail | | LI Xi-yuan | Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China | | | TENG Hui | Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China | | | ZHAO Yu-jie | AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | CHEN Chun-mei | Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China | | | YU Guang-hui | Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China | | | GUAN Dong-xing | Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China | dxguan@tju.edu.cn |
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| Abstract: |
| 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. |
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