Microchimica Acta

, 186:595 | Cite as

Voltammetric determination of nitrite by using a multiwalled carbon nanotube paste electrode modified with chitosan-functionalized silver nanoparticles

  • Sania Bibi
  • Muhammad Iqbal Zaman
  • Abdul Niaz
  • Abdur RahimEmail author
  • Mohsan Nawaz
  • Muhammad Bilal Arian
Original Paper


A cyclic voltammetric method is described for the determination of nitrite by using a multiwalled carbon nanotube paste electrode (MWCNT) that was modified with chitosan-functionalized silver nanoparticles (Chit-AgNPs). The AgNPs were prepared by one step procedure using chitosan as stabilizing agent. The resulting modified AgNPs were drop-coated onto the electrode. By combining the advantages of chitosan, AgNPs (in the form of Chit-AgNPs) and MWCNT, the assay exhibits a remarkable improvement in the cyclic voltammetric response towards the oxidation of nitrite at a typical peak potential of 0.81 V (vs. SCE) in buffer of pH 4.0. The accumulation of nitrite on the electrode also was achieved, and this further enhances the analytical sensitivity. Under optimized conditions, the oxidation peak current increases linearly in the 100 nM to 50 μM nitrite concentration range, and the detection limit is 30 nM. The method has high selectivity for nitrite even in the presence of other potentially interfering ions.

Graphical abstract

Schematic illustration of the prepared chitosan functionalized silver nanoparticles (transmission electron microscope image) and modification of multi-walled carbon nanotube paste electrode with chitosan functionalized silver nanoparticles for the electrochemical oxidation of nitrite to nitrate.


Chitosan Functionalized silver nanoparticles Modified carbon nanotubes paste electrode Nitrite assay Cyclic voltammetry River water 



The financial support from the project “Pak-US No6-4/PAK-US/HEC/2015/04” is highly acknowledged.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3699_MOESM1_ESM.docx (45 kb)
ESM 1 (DOCX 45 kb)


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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of Science & technologyBannuPakistan
  2. 2.Interdisciplinary Research Centre in Biomedical Materials (IRCBM)COMSATS University IslamabadLahorePakistan
  3. 3.Department of ChemistryHazara UniversityMansehraPakistan
  4. 4.Department of ChemistryUniversity of KarachiKarachiPakistan

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