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Exploiting the pH-Cross Sensitivity of Ion-Selective Optodes to Broaden Their Response Range.

Fabian Steininger¹, Johan Palmfeldt², Klaus Koren¹

¹Aarhus University Centre for Water Technology, Department of Biology, Section for Microbiology, Aarhus University, Ny Munkegade 114-1540, Aarhus C, 8000, Denmark.

|August 22, 2024

Summary

pH cross-sensitivity in ion-selective optodes can be leveraged to expand their measuring range. Immobilized pH gradients enhance optode performance, increasing the effective measurement range for ions like sodium.

Keywords:

Ion-selective optodes chromoionophores immobilized pH gradients optical sensors sensor characteristics

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Area of Science:

Chemical Sensing
Analytical Chemistry
Materials Science

Background:

Chromoionophore-based ion-selective optodes (ISOs) traditionally face limitations due to pH cross-sensitivity.
This pH dependency is often viewed as a drawback in sensor applications.

Discussion:

This study reframes pH cross-sensitivity as an advantageous characteristic for ISOs.
Integrating ISOs with immobilized pH gradient (IPG) gels creates a stable pH gradient across the optode.
This gradient effectively shifts the response range of the ISOs, enhancing their utility.

Key Insights:

The measuring range of sodium-selective optodes was extended by up to 2.5 log units using IPG gels.
The enhancement in measuring range is directly proportional to the magnitude of the pH gradient.
This technique is adaptable to various ion-selective chromoionophore-based optodes.

Outlook:

This approach offers a pathway to develop more versatile and sensitive optodes for a wider array of analytes.
Future research can explore greater enhancements with more pronounced pH gradients.
The findings have broad implications for advancing chemical sensing technologies.