Analytical and Bioanalytical Chemistry

, Volume 410, Issue 20, pp 4953–4957 | Cite as

Sensitive electrochemical detection of sodium azide based on the electrocatalytic activity of the pasting liquid of a carbon paste electrode

  • Kaixuan Li
  • Moyan Han
  • Fengxia Wu
  • Anaclet Nsabimana
  • Wei Zhang
  • Jianping Li
  • Guobao Xu
Research Paper


Sodium azide (NaN3) is highly toxic and widely used in, for example, automobile airbags and biochemical laboratories. The electrochemical detection of sodium azide on commonly used electrodes is challenging due to sluggish electron transfer, but it has been achieved using a boron-doped diamond thin-film electrode and a highly oriented pyrolytic graphite electrode. Utilizing the electrocatalytic activity of the pasting liquid of a carbon paste electrode, we developed an effective method for the electrochemical detection of sodium azide in which silicone oil was employed as the pasting liquid of the carbon paste electrode. This simple and cheap silicone-oil-based carbon paste electrode exhibited comparable sensitivity to the boron-doped diamond thin-film electrode and highly oriented pyrolytic graphite electrode. The limit of detection for sodium azide at the silicone-oil-based carbon paste electrode was found to be 0.1 μM. Recoveries from diluted human serum samples were between 97.2 and 101.3%.

Graphical abstract


Sodium azide Pasting liquid Electrocatalysis Carbon paste electrode Detection 



Financial support from the National Natural Science Foundation of China (nos. 21675148 and 21505128), the Natural Science Foundation of Guangxi Province of China (project no. 2015GXNSFFA139005), the National Key Research and Development Program of China (no. 2016YFA0201300), and the CAS-TWAS (Academy of Sciences for the Developing World) President’s Fellowship for International PhD Students is appreciated.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Chemistry and BioengineeringGuilin University of TechnologyGuilinChina
  2. 2.State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied ChemistryChinese Academy of SciencesJilinChina
  3. 3.University of Science and Technology of ChinaHefeiChina
  4. 4.University of the Chinese Academy of Sciences, Chinese Academy of SciencesBeijingChina

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