Citation: LI Yang, REN Zhen-Xing, QI Ren-Long, TONG Jian-Hua, BIAN Chao, DONG Han-Peng, XIA Shan-Hong. Detection of Total Nitrogen Based on Electrochemical Sensor[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(3): 316-322. doi: 10.19756/j.issn.0253-3820.191714 shu

Detection of Total Nitrogen Based on Electrochemical Sensor

1.
State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2.
College of Mechanical Engineering, Chengdu University, Chengdu 610106, China;
3.
College of Electrical Engineering, Zhengzhou University of Science and Technology, Zhengzhou 450064, China

Received Date: 3 December 2019
Revised Date: 30 December 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 61701475, 61771451), the Open Research Fund of Key Laboratory of MEMS of Ministry of Education, Southeast University (No. 3206009301) and the Open Research Fund of State Key Laboratory of Transducer Technology (No. SKT15015).

A system based on electrochemical microsensor was developed for total nitrogen (TN) determination in freshwaters. A new method combined alkaline potassium persulfate digestion with electrochemical sensor was used to detect TN concentration. After the digestion pretreatment for water samples, a customized electrochemical sensor, rather than the expensive spectrophotometer, was employed to detect the nitrate concentration in the digested solution, and then the TN concentration was calculated by a portable meter. Copper was electrodeposited onto the working-electrode of the sensor as the electrocatalyst material and performed high sensitivity in nitrate detection. The calibration in digested samples showed that the system had a sensitivity of 7.31 μA·L/mg for TN in the concentration range of 0.2-2.0 mg/L. The concentrations of TN in 3 standard samples and 6 real samples from lakes and rivers were detected by the portable electrochemical system, and the results were in good agreement with the data obtained by standard TN measurement method with the maximal relative deviation of 26.9%.
- Total nitrogen,
- Alkaline potassium persulfate digestion,
- Electrochemical sensor,
- Nitrate,
- Water sample
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沈阳化工大学材料科学与工程学院沈阳 110142