Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel
Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel
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DOI：
10.1021/acs.est.1c05661
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发表时间：
2022-04-19
影响因子：
11.4
通讯作者：
Li, Baikun
中科院分区：
文献类型：
--
作者：
Fan, Yingzheng;Wang, Xingyu;Li, Baikun
准确、持续监测土壤氮对于确定其命运并为快速土壤养分管理提供早期预警至关重要。然而，现有电化学传感器的准确性受到目标离子的固定性、离子对土壤颗粒的吸附以及传感器读数噪声和随时间漂移的阻碍。本研究将厚度为0.45μm的聚丙烯酰胺水凝胶涂覆在固态离子选择膜（S-ISM）传感器的表面，以吸收土壤中的水分，从而提高这些传感器监测土壤中铵（NH4+）和硝酸盐（NO3-）离子的精度（R-2>0.98）和稳定性（漂移<0.3mV/h）。考虑土壤吸附过程和土壤复杂性，建立离子输运模型来模拟长期NH4+动态过程（R-2>0.7）。此外，基于土壤传感器的独特特征，包括异质传感器-水凝胶-土壤界面上的非线性传质和离子扩散，开发了一种基于土壤的去噪数据处理算法（SDDPA）。使用真实土壤进行的 14 天测试证明了 S-DDPA 消除虚假信号并检索准确的实际土壤氮信息的有效性（错误：
Accurate and continuous monitoring of soil nitrogen is critical for determining its fate and providing early warning for swift soil nutrient management. However, the accuracy of existing electrochemical sensors is hurdled by the immobility of targeted ions, ion adsorption to soil particles, and sensor reading noise and drifting over time. In this study, polyacrylamide hydrogel with a thickness of 0.45 mu m was coated on the surface of solid-state ion-selective membrane (S-ISM) sensors to absorb water contained in soil and, consequently, enhance the accuracy (R-2 > 0.98) and stability (drifting < 0.3 mV/h) of these sensors monitoring ammonium (NH4+) and nitrate (NO3-) ions in soil. An ion transport model was built to simulate the long-term NH4+ dynamic process (R-2 > 0.7) by considering the soil adsorption process and soil complexity. Furthermore, a soil-based denoising data processing algorithm (SDDPA) was developed based on the unique features of soil sensors including the nonlinear mass transfer and ion diffusion on the heterogeneous sensor-hydrogel-soil interface. The 14 day tests using real- world soil demonstrated the effectiveness of S-DDPA to eliminate false signals and retrieve the actual soil nitrogen information for accurate (error: