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Updated: Jun 28, 2026
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Dynamic Electrochemical Measurement of Chloride Ions
Published on: February 5, 2016
Optical chloride sensor based on [9]mercuracarborand-3 with massively expanded measuring range.
1Department of Chemistry, Auburn University, 179 Chemistry Bldg, Auburn, AL 36849, USA.
Talanta
|October 31, 2008
Summary
This study expands the measuring range of chloride optical sensors to six orders of magnitude using a novel plasticized poly(vinyl chloride) film. The enhanced sensor utilizes a two-step ionophore binding mechanism for improved chloride detection.
Area of Science:
- Analytical Chemistry
- Chemical Sensing
- Materials Science
Background:
- Bulk optodes for monovalent ions typically have a limited measuring range of two orders of magnitude.
- Developing sensors with broader detection ranges is crucial for various analytical applications.
Purpose of the Study:
- To expand the measuring range of fluorescent chloride optical sensors.
- To optimize a sensing film for enhanced chloride detection using a two-step ionophore binding mechanism.
Main Methods:
- Optimized a fluorescent chloride optical sensing film using plasticized poly(vinyl chloride).
- Incorporated the halide-selective ionophore [9]mercuracarborand-3 and H(+)-chromoionophore ETH 5418.
- Utilized a two-step ionophore binding mechanism with 1:2 and 1:1 binding stoichiometries.
Main Results:
- Expanded the measuring range to six orders of magnitude concentration change.
- Determined complex formation constants: logK(1)=9.1 and logK(2)=2.7.
- Demonstrated excellent selectivity against thiocyanate, salicylate, nitrate, and perchlorate.
Conclusions:
- The optimized optode significantly broadens the detection range for chloride ions.
- The two-step ionophore binding mechanism is effective for expanding sensor capabilities.
- The sensor exhibits high selectivity, with bromide and iodide as main interferences.
