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Characterization and Quantification of Polyquaterniums via Single-Use Polymer Membrane-Based Polyion-Sensitive
Stephen A Ferguson1, Mark E Meyerhoff1
1Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.
ACS Sensors
|July 21, 2017
Summary
New methods quantify polymeric quaternary ammonium salts (polyquaterniums) using ion-selective electrodes. These robust techniques offer direct and indirect detection, with the indirect method achieving ppm detection limits for reliable analysis.
Area of Science:
- Analytical Chemistry
- Polymer Science
- Environmental Science
Background:
- Polymeric quaternary ammonium salts (polyquaterniums, PQs) are widely used but require accurate quantification.
- Existing methods for PQ analysis can be complex or lack sensitivity.
- Development of facile and robust analytical techniques is crucial for environmental and industrial applications.
Purpose of the Study:
- To develop and validate simple, universal methods for quantifying and characterizing polyquaterniums.
- To utilize potentiometric polyion-sensitive electrodes for PQ detection.
- To assess the applicability of these methods for real-world samples, including drinking water.
Main Methods:
- Direct potentiometric detection using polycation-sensitive electrodes (NaDNNS-based).
- Indirect potentiometric detection via titration with polyanion sensors (TDMAC-doped) and dextran sulfate (DS).
- Analysis of four different polyquaterniums (PQ-2, PQ-6, PQ-10, PMETAC) and application to drinking water samples.
Main Results:
- Direct detection provides insights into polycation charge density.
- Indirect titration method demonstrated high reliability and achieved parts-per-million (ppm) detection limits.
- The titration method successfully detected excess PQ-6 in purified drinking water from a municipal treatment plant.
Conclusions:
- Potentiometric polyion-sensitive electrodes offer facile, robust, and universal quantification of polyquaterniums.
- The indirect titration method is superior for achieving low detection limits and reliable analysis.
- These methods have practical implications for monitoring water quality and ensuring the safety of drinking water supplies.
