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Related Experiment Video

Updated: Jul 3, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Innovative solid-state microelectrode for nitrite determination in a nitrifying granule.

Shao-Yang Liu1, You-Peng Chen, Fang Fang

  • 1Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.

Environmental Science & Technology
|July 9, 2008
PubMed
Summary
This summary is machine-generated.

A novel solid-state microelectrode for in situ nitrite determination was developed. This cost-effective device enables precise measurement of nitrite concentration in biofilms and microbial granules for wastewater treatment.

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Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method

Published on: December 25, 2016

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Last Updated: Jul 3, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

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Published on: December 6, 2018

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
08:25

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method

Published on: December 25, 2016

Area of Science:

  • Electrochemistry
  • Environmental Science
  • Analytical Chemistry

Background:

  • Nitrite is a key intermediate in biological nitrogen removal processes.
  • Accurate in situ measurement of nitrite in biofilms and microbial granules is crucial but lacks suitable instrumentation.
  • Existing liquid membrane microelectrodes are less reliable and cost-effective.

Purpose of the Study:

  • To develop a novel solid-state microelectrode for in situ nitrite determination.
  • To create a cost-effective, efficient, and reliable alternative to existing nitrite measurement methods.
  • To demonstrate the microelectrode's capability in analyzing nitrite microprofiles in complex biological systems.

Main Methods:

  • Fabrication of a gold microelectrode using photolithography.
  • Electrochemical codeposition of Platinum-Iron (Pt--Fe) nanoparticles onto the gold microelectrode.
  • Characterization of the modified electrode surface and electrochemical response to nitrite.

Main Results:

  • Successful fabrication of a solid-state microelectrode with Pt--Fe nanoparticles (average diameter 50 nm).
  • Observation of a characteristic sigmoid peak in linear sweep voltammetry for nitrite detection.
  • Quantitative determination of nitrite concentration (0.001–0.05 M) with a detection limit of approximately 3 x 10(-5) M.
  • Demonstration of high spatial resolution nitrite microprofile measurements in aerobic granules.

Conclusions:

  • The developed solid-state microelectrode offers a viable solution for in situ nitrite determination.
  • This technology provides a more cost-effective and reliable alternative for monitoring nitrogen removal processes.
  • The microelectrode shows significant potential for applications in environmental monitoring and wastewater treatment research.