Citation: JIANG Hao-Yan, LIU Xin, XU Yu-Hao, LI Yang, TONG Jian-Hua, BIAN Chao. Rapid Detection System for Soil Nitrate Based on Palladium-Gold Modified Ultramicro Interdigital Electrode Chip[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(8): 1342-1349. doi: 10.19756/j.issn.0253-3820.211124 shu

Rapid Detection System for Soil Nitrate Based on Palladium-Gold Modified Ultramicro Interdigital Electrode Chip

JIANG Hao-Yan ^1,2 ,
LIU Xin ^1,2 ,
XU Yu-Hao ^1,2 ,
LI Yang ¹ ,
TONG Jian-Hua ¹ ,
BIAN Chao ^1,,

1.
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;
2.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: BIAN Chao, cbian@mail.ie.ac.cn
Received Date: 6 February 2021
Revised Date: 26 April 2021

Fund Project: Supported by the National Key Research and Development Project of China (No.2020YFB2009003).

To meet the needs of rapid detection of nitrate in soil, a field rapid detection system for nitrate in soil was designed, which integrated the functions of soil leaching solution acquisition and nitrate detection. Nano palladium and gold modified ultramicro interdigital sensing electrode was used for nitrate detection. The sensing electrode was fabricated using micro-electro-mechanical systems (MEMS) technique, and the integrated structure was interdigital array of working electrode and counter electrode. Palladium and gold were modified on the surface of the working electrode by potentiostatic method to form a palladium-gold composite sensitive film. Through the optimization of the preparation parameters of the sensor electrode, the linear response range of the sensor electrode to nitrate was 0.5-100 mg/L (as N), the detection limit was 0.13 mg/L (3σ), the sensitivity was 1.8 μA·L/mg, and the relative deviation was less than 10% after 70 times of continuous repeated measurement. Furthermore, the developed sensor electrode had certain anti-interference ability against common ions in soil including Cl^-, CO₃^2-, SO₄^2- and Si₄^2-. The soil leaching solution was obtained by the developed soil nitrate detection system, and the nitrate in the leaching solution was detected. The detection results correlated with the detection results of the standard method.
- Soil,
- Nitrate detection,
- Electrochemical sensor,
- Ultramicro interdigital electrode,
- Micro-electro-mechanical system,
- Pd-Au composite membrane
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沈阳化工大学材料科学与工程学院沈阳 110142