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Updated: Jun 27, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
Simultaneous determination of nitrate and dissolved oxygen under neutral conditions using a novel silver-deposited
You-Peng Chen1, Shao-Yang Liu, Fang Fang
1Department of Chemistry and National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei 230026, China.
Abstract:
In this work a novel gold-based microelectrode was successfully fabricated using photolithographic techniques and electrochemical deposition for a simultaneous determination of nitrate and dissolved oxygen (DO) under neutral conditions. Three-dimensional tree-shaped silver nanorods were formed on the gold surface through electrochemical deposition and they had an electrochemical catalytic reductive activity for both nitrate and oxygen under neutral conditions. Thus, the silver nanorods served as the active center of the microelectrode. The microelectrode could be renewed over five times. Linear sweep voltammetry was employed to quantitatively analyze the nitrate and DO in solution. The microelectrode was used to measure the nitrate and DO microprofiles in a nitrifying aerobic granule from a sequencing batch reactor, which shows that denitrification did not occur in the tested granule. The measurement results demonstrate that the microelectrode was able to simultaneously determine the nitrate and DO levels in the granules under neutral conditions accurately and precisely.
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