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| Extraction and detection method of nitrate nitrogen in soil using diffusive gradients in thin-films（DGT） |
| Received:May 07, 2025 |
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| KeyWord:nitrate-specific adsorption resin;diffusive gradients in thin-films technique;soil nitrate nitrogen |
| Author Name | Affiliation | E-mail | | SUN Jiangtao | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Chuangchuang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Wenjing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | GAO Guanwei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZUO Jiahui | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | JIANG Changlong | Hefei Institutes of Physical Science, China Academy of Sciences, Hefei 231100, China | | | ZHAO Yujie | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yujiezhao@126.com |
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| Abstract: |
| Diffusive gradients in thin-films（DGT） technique enables in situ enrichment of nitrate nitrogen from soil, serving as a crucial tool for investigating its migration and transformation patterns. This study developed a novel DGT binding gel using dimethyloctylamine（DMOA）-functionalized anion exchange resin（DMOA-PS-DVB） as the adsorption material. Experimental results demonstrated that DMOA-PS-DVB exhibited monodisperse hollow spherical morphology with an average particle diameter of 129.57 μm. The DMOA binding gel structure maintaining uniform dispersion. Nitrate adsorption capacity of the gel reached 132.64 μg·cm-2 with an elution efficiency of 95%±2% achieved using 1 mol·L-1 NaCl solution for 60 min elution. This developed DGT device exhibited effective nitrate extraction across a broad pH range（3-9） and maintained functionality under ionic strength conditions below 15 mmol·L-1. Furthermore, DGT exhibited robust resistance to common environmental interfering ions, with nitrate nitrogen adsorption remaining unaffected under conditions where sulfate, phosphate, and chloride ion concentrations were below 15, 10 mmol·L-1, and 15 mmol·L-1, respectively. Finally, the DGT technique was employed for nitrate detection from nine distinct soil types. Results revealed a statistically significant correlation between nitrate contents determined by this method and those obtained using standard methods, demonstrating that the DGT approach could be applied to accurately characterize soil nitrate content. This investigation established that DMOA-DGT provided an innovative approach for in situ rapid detection of soil nitrate nitrogen, offering substantial potential for elucidating nitrate migration mechanisms and enhancing environmental risk assessment frameworks in agricultural ecosystems. |
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