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A colorimetric sensor array for organics in water.

Chen Zhang1, 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
|August 18, 2005
PubMed
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This study introduces a simple colorimetric sensor array for identifying and quantifying organic compounds in water. The hydrophobic dye array offers high chemical selectivity, distinguishing even similar compounds and complex mixtures.

Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Detecting organic compounds in water is difficult due to water's high concentration.
  • Existing methods may lack selectivity or require complex procedures.

Purpose of the Study:

  • To develop a simple, selective colorimetric sensor array for analyzing organic compounds in aqueous solutions.
  • To demonstrate the array's capability in identifying and quantifying diverse organic analytes.

Main Methods:

  • Fabrication of sensor arrays by printing hydrophobic dyes onto a hydrophobic membrane.
  • Immersion of the sensor array in aqueous solutions containing organic analytes.
  • Digital imaging of the dye array before and after analyte exposure to capture color changes.

Main Results:

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  • The sensor array exhibited substantial chemical selectivity for various organic compounds.
  • Distinct color change profiles (fingerprints) were generated for different organic analytes.
  • Effective identification and quantification were achieved for single compounds and complex mixtures over a concentration range of 0.1 M to 1 µM.
  • Commercial soft drinks were successfully distinguished using this approach.

Conclusions:

  • The developed colorimetric sensor array provides a facile and effective method for analyzing organic compounds in water.
  • This technology offers high selectivity, enabling differentiation of closely related compounds and complex mixtures.
  • The sensor array has potential applications in environmental monitoring, food analysis, and chemical diagnostics.