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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

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Luminescence Lifetime Imaging of O2 with a Frequency-Domain-Based Camera System
08:35

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Published on: December 16, 2019

Optical sensor for sulfur dioxide based on fluorescence quenching.

T M Razek1, M J Miller, S S Hassan

  • 1Department of Chemistry, University of Iowa, Iowa City, IA 52242, USA.

Talanta
|October 31, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel optical sensor for detecting sulfur dioxide (SO2) gas. Rhodamine B isothiocyanate dye and a solid-state fluorometer provide sensitive and selective SO2 measurements.

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Area of Science:

  • Analytical Chemistry
  • Chemical Sensing
  • Materials Science

Background:

  • Accurate measurement of sulfur dioxide (SO2) gas is crucial for environmental monitoring and industrial safety.
  • Development of sensitive and selective optical sensors offers a promising alternative to traditional analytical methods.

Purpose of the Study:

  • To evaluate potential indicator dyes for optical sensors designed to measure gaseous sulfur dioxide.
  • To develop a solid-state fluorometer for real-time SO2 detection using fluorescence quenching.

Main Methods:

  • Screening of indicator dyes for sensitivity to sulfur dioxide and oxygen.
  • Fabrication of sensing membranes using silicone and Rhodamine B isothiocyanate.
  • Utilizing a modulated blue LED and lock-in detection for high signal-to-noise ratio fluorescence measurements.

Main Results:

  • Rhodamine B isothiocyanate demonstrated high sensitivity to dynamic quenching by sulfur dioxide.
  • The developed solid-state fluorometer achieved a limit of detection of 0.114+/-0.009% for SO2 in nitrogen.
  • The sensor showed no interference from common gases like HCl, NH3, NO, and CO2, but oxygen influenced the response.

Conclusions:

  • Rhodamine B isothiocyanate is a suitable indicator dye for SO2 optical sensors.
  • The solid-state fluorometer provides a sensitive, selective, and robust platform for gaseous SO2 monitoring.
  • Further investigation into oxygen's effect on sensor performance is warranted.