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Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
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Published on: April 23, 2019

Preoxidation for colorimetric sensor array detection of VOCs.

Hengwei Lin1, Minseok Jang, Kenneth S Suslick

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|October 5, 2011
PubMed
Summary

A novel preoxidation method significantly enhances volatile organic compound (VOC) detection using colorimetric sensors. This technique improves sensitivity and lowers detection limits for 20 indoor VOCs, aiding in accurate identification and monitoring.

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Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Volatile organic compounds (VOCs) pose significant indoor air quality risks.
  • Current methods for VOC detection often lack sensitivity for less-reactive compounds.
  • Colorimetric sensor arrays offer potential for VOC monitoring but require improved performance.

Purpose of the Study:

  • To develop and evaluate a disposable preoxidation technique to enhance VOC detection by colorimetric sensor arrays.
  • To improve the sensitivity and lower the limits of detection (LODs) for a range of indoor VOCs.
  • To enable the identification and discrimination of common indoor VOCs at relevant exposure levels.

Main Methods:

  • A preoxidation tube packed with chromic acid on silica was used.
  • Vapor streams containing VOCs were passed through the preoxidation tube before reaching a colorimetric sensor array.
  • The performance of the sensor array with and without preoxidation was compared.

Main Results:

  • The preoxidation technique substantially increased sensitivity to less-reactive VOCs.
  • Limits of detection (LODs) were improved approximately 300-fold on average.
  • The system successfully detected, identified, and discriminated 20 common indoor VOCs at IDLH and PEL concentrations.
  • Average LODs were 1.4% of respective PELs.

Conclusions:

  • Disposable preoxidation is a highly effective method for enhancing VOC detection with colorimetric sensors.
  • This technique significantly improves the ability to monitor indoor VOCs at safe and hazardous levels.
  • The enhanced sensor system provides a sensitive and discriminative tool for indoor air quality assessment.