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Related Experiment Videos

Hybrid fluorometric flow analyzer for ammonia.

Natchanon Amornthammarong1, Jaroon Jakmunee, Jianzhong Li

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA.

Analytical Chemistry
|March 16, 2006
PubMed
Summary

This study presents a sensitive instrument for measuring ambient ammonia using a hybrid flow analysis system. The device offers robust, automated detection with high precision for environmental monitoring.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Instrument Development

Background:

  • Accurate determination of ambient ammonia is crucial for environmental monitoring and air quality assessment.
  • Traditional methods may lack the sensitivity, robustness, or automation required for continuous atmospheric measurements.

Purpose of the Study:

  • To develop and validate a novel, highly sensitive instrument for the determination of ambient ammonia.
  • To achieve robust and automated measurement of atmospheric ammonia with high precision.

Main Methods:

  • A hybrid flow analysis system combining flow injection (FI) and sequential injection (SI) principles.
  • Atmospheric ammonia collection via membrane diffusion into deionized water, followed by online derivatization to 1-sulfonatoisoindole.

Related Experiment Videos

  • Fluorometric detection using an inexpensive light-emitting diode (LED) photodiode-based detector.

    • Main Results:

    • Linear response (r² = 0.9990) for ambient ammonia in the 0-20 ppbv range.
    • Limit of detection (S/N = 3) of 135 parts per trillion by volume (pptv).
    • Excellent long-term precision (RSD = 3% at 5 ppbv) over 9 days of automated operation.

    Conclusions:

    • The developed instrument is robust, highly sensitive, and precise for ambient ammonia determination.
    • The hybrid FI-SI system offers advantages in stability, sensitivity, flexibility, and robustness.
    • This instrument is suitable for continuous, automated environmental monitoring of atmospheric ammonia.