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Updated: May 13, 2026

Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research

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Published on: April 18, 2013

A study on hexachromic ion selective electrode based on supported liquid membranes.

Y W Choi¹, S H Moon

¹Department of Environmental Science and Engineering and Advanced Environmental Monitoring Research Center, Kwangju Institute of Science and Technology, Korea.

Environmental Monitoring and Assessment

|August 23, 2001

Summary

This study developed a highly selective ion selective electrode (ISE) using supported liquid membranes (SLMs) with trioctylphosphine oxide (TOPO) for Cr(VI) detection. The optimized SLM effectively measured Cr(VI) concentrations down to 1 x 10(-6) M.

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Published on: February 23, 2017

Area of Science:

Analytical Chemistry
Environmental Science

Background:

Hexavalent chromium (Cr(VI)) poses significant environmental and health risks.
Accurate and selective detection methods for Cr(VI) are crucial for monitoring and remediation.

Purpose of the Study:

To develop and optimize an ion selective electrode (ISE) for sensitive Cr(VI) determination.
To investigate the performance of supported liquid membranes (SLMs) incorporating trioctylphosphine oxide (TOPO) as a carrier for Cr(VI).

Main Methods:

Fabrication and optimization of SLMs using TOPO, o-nitrophenyl octyl ether (NPOE), and poly(vinyl chloride).
Electrochemical measurements using the ISE to determine Cr(VI) concentration over a range of 1 x 10(-3) to 1 x 10(-6) M.
Experimental determination of selectivity coefficients and detection limits in the presence of common interfering ions using the fixed interference method.

Main Results:

The optimized SLM composition demonstrated high selectivity for Cr(VI) over sulfate, nitrate, nitrite, and chloride ions.
The ISE system successfully detected Cr(VI) in the concentration range of 1 x 10(-3) to 1 x 10(-6) M.
Evidence suggests Cr(VI) transport through the SLM occurs as a triply charged ion, supported by the emf response slope.

Conclusions:

The developed ISE with TOPO-based SLMs offers a selective and sensitive method for Cr(VI) detection.
The optimized SLM composition is effective for environmental monitoring applications requiring Cr(VI) analysis.
Further studies can explore the mechanism of Cr(VI) transport and potential applications in complex matrices.