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Highly selective silver nanoparticles based label free colorimetric sensor for nitrite anions.

V Vinod Kumar1, Savarimuthu Philip Anthony1

  • 1School of Chemical and Biotechnology, SASTRA University, Thanjavur 613402, Tamil Nadu, India.

Analytica Chimica Acta
|August 17, 2014
PubMed
Summary

A new colorimetric sensor using silver nanoparticles (AgNPs) and a phenolic ligand selectively detects nitrite (NO2-) ions. This label-free method offers a low detection limit and works in various water samples.

Keywords:
Anions sensorFunctionalized silver nanoparticlesNitrite colorimetric sensorSilver nanoparticles colorimetric sensor

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Nitrite (NO2-) is a significant water pollutant.
  • Developing selective and sensitive sensors for nitrite detection is crucial for environmental monitoring.
  • Existing methods often require complex procedures or expensive equipment.

Purpose of the Study:

  • To develop a highly selective, label-free colorimetric sensor for nitrite anions.
  • To utilize silver nanoparticles (AgNPs) stabilized by a phenolic chelating ligand for sensing applications.
  • To demonstrate the sensor's efficacy in real-world water samples.

Main Methods:

  • Synthesis of silver nanoparticles (AgNPs) stabilized by N,N'-bis(2-hydroxybenzyl)-1,2-diaminobenzene (1).
  • Colorimetric detection of nitrite (NO2-) through the selective decolourisation of the AgNPs.
  • Absorption spectroscopy to monitor the changes and confirm the conversion of AgNPs to silver ions.
  • Interference studies to assess selectivity against other anions and cations.

Main Results:

  • The sensor exhibited selective decolourisation of the brownish-yellow color of 1-AgNPs upon addition of nitrite.
  • A low detection limit of 10(-7)M for nitrite was achieved.
  • High selectivity for nitrite sensing was confirmed in the presence of various interfering ions.
  • The sensor demonstrated practical applicability for nitrite detection in ground, river, pond, and tap water samples.

Conclusions:

  • A novel, label-free colorimetric sensor for selective nitrite detection has been successfully developed.
  • The sensor based on AgNPs and a phenolic ligand offers a sensitive, selective, and cost-effective approach.
  • The method is suitable for real-time monitoring of nitrite in diverse water matrices under ambient conditions.