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Updated: Jun 28, 2026
06:08
Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
A chemiluminescence-based continuous flow aqueous ozone analyzer using photoactivated chromotropic acid
Toshio Takayanagi1, Purnendu K Dasgupta
1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA.
Talanta
|October 31, 2008
Summary
A new method uses photoactivated chromotropic acid to detect ozone in water, offering a fast and sensitive approach for water treatment monitoring. This chemiluminescence technique provides accurate ozone measurements crucial for effective disinfection processes.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Water Treatment Technology
Background:
- Ozone is a preferred oxidant for water disinfection in large facilities.
- Accurate monitoring of ozone levels is critical for effective water treatment.
- Existing methods may lack the speed or sensitivity required for real-time analysis.
Purpose of the Study:
- To develop a fast and sensitive method for determining ozone content in water.
- To utilize the chemiluminescence reaction between ozone and photoactivated chromotropic acid.
- To establish a reliable method for monitoring ozonation status in water treatment.
Main Methods:
- Flow-injection analysis of ozonated water.
- Reaction with photoactivated chromotropic acid (CA) to induce chemiluminescence (CL).
- Detection using a photomultiplier tube (PMT) with a miniature detector.
Main Results:
- Achieved a limit of detection of 3 µg/L for aqueous ozone at S/N=3.
- Obtained a good response slope up to 1.4 mg/L ozone concentration.
- Demonstrated a quadratic response (r²=0.9984) with no interference from permanganate ion.
Conclusions:
- The developed method is fast, sensitive, and suitable for monitoring ozone in water treatment.
- Photoactivation of CA significantly enhances the chemiluminescence signal.
- The system was successfully applied to monitor ozonation in playa lake water.
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