硝酸盐
检出限
环境科学
萃取(化学)
肥料
硫化物
硝酸镉
滤波器(信号处理)
环境化学
化学
材料科学
镉
计算机科学
色谱法
冶金
有机化学
计算机视觉
作者
Shan Chen,Jinghu Chen,Mingyan Qian,Jun Liu,Yimin Fang
标识
DOI:10.1016/j.electacta.2023.142077
摘要
The excessive use of nitrate fertilizer in agriculture has been a serious problem causing giant economic loss and environment pollution. Therefore, nitrate sensing in soil is very important for environment and agriculture. In this work, we develop a rapid sensing platform for on-site nitrate detection, which is composed of an easily conducted extraction filter (ECEF) and a sensing element based on cadmium sulfide nanorods (CdS NRs) modified screen printed electrode (CdS NRs-SPE). Nitrate extraction from soil can be easily conducted by ECEF in 3 min using a syringe coupled with a filter. The extracted solution is subsequently injected onto the CdS NRs-SPE, which can directly detect nitrate in neutral media within 10 min. The detection limit of nitrate is 2.3 μM (S/N = 3) and a linear range from 0.05 to 5 mM. Moreover, the CdS NRs-SPEs are portable, low cost (3 dollars), and can be reused for over one month without significant loss of the performance, implying its promising application for intelligent nitrogen-management and developing precise fertilization in modern agriculture.
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