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Low cost, portable voltammetric sensors for rapid detection of nitrate in soil

文献类型： 外文期刊

作者： Chen, Shan 1 ; Chen, Jinghu 2 ; Qian, Mingyan 1 ; Liu, Jun 1 ; Fang, Yimin 2 ;

作者机构： 1.Minist Agr & Rural Affairs, Inst Agr Facil & Equipment, Jiangsu Acad Agr Sci, Key Lab Protected Agr Engn Middle & Lower Reaches, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Med Univ, Sch Pharm, Key Lab Cardiovasc & Cerebrovascular Med, Nanjing 211166, Peoples R China

关键词： Nitrate; Cadmium sulfide; Screen printed electrodes; On -site detection; Soil samples

期刊名称：ELECTROCHIMICA ACTA （ 影响因子：6.6； 五年影响因子：6.0 ）

ISSN： 0013-4686

年卷期： 2023 年 446 卷

页码：

收录情况： SCI

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 mu M (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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