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Optical rubbery ormosils sensor for the detection of ammonia.

X Chen1, Y J Dai, Z Li

  • 1Department of Chemistry, Xiamen University, China. xichen@xmu.edu.cn

Fresenius' Journal of Analytical Chemistry
|October 5, 2001
PubMed
Summary

Researchers developed a novel optochemical sensor using rubbery ormosil films with immobilized aminofluorescein (AF) for accurate ammonia detection in water. This sensor offers a low detection limit and rapid response time, making it suitable for environmental monitoring.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Optochemical sensors offer sensitive detection methods.
  • Ammonia detection in water is crucial for environmental monitoring.
  • Ormosil films provide a versatile matrix for immobilizing sensing molecules.

Purpose of the Study:

  • To develop an optochemical sensor for ammonia determination in water.
  • To immobilize aminofluorescein (AF) within rubbery ormosil films.
  • To characterize the sensor's performance and stability.

Main Methods:

  • Fabrication of ormosil films using tetramethoxysilane (TMOS) and dimethyldimethoxysilane (DiMeDMOS).
  • Immobilization of aminofluorescein (AF) within the ormosil matrix.
  • Characterization of sensor response to ammonia, pH, and interfering substances.

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Main Results:

  • The developed sensor demonstrated a detection limit of 0.2 microg mL(-1) for ammonia.
  • Linear response observed in the concentration range of 0.5 to 80 microg mL(-1).
  • Sensor exhibited a response time of less than 5 minutes and stability for 6 months.

Conclusions:

  • Rubbery ormosil films with immobilized AF are effective for optochemical ammonia sensing.
  • The sensor shows promising performance for water quality monitoring.
  • Further investigation into the effects of environmental factors is warranted.