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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Potentiometry: Overview01:06

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...

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Related Experiment Video

Updated: May 28, 2026

Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research
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A Multichannel Solid-State Potentiometric Sensor Array for Heavy Metal Ions.

Zongfeng Wei1, Guanliang Li2, Zhuqing Wang2

  • 1School of Communication and Electronic Engineering, Shandong Normal University, Jinan 250014, China.

Sensors (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel peptide-based microelectrode array for detecting multiple heavy metal ions like copper, cadmium, and lead simultaneously. This sensor offers a simpler, more cost-effective alternative to traditional methods for environmental monitoring.

Keywords:
heavy metal ionsmultichannel potentiometric arraypeptide recognitionsimultaneous detection

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Published on: December 6, 2015

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Heavy metal ions (Cu2+, Cd2+, Pb2+) are significant environmental contaminants.
  • Conventional detection methods are often costly and require complex sample preparation.
  • There is a need for efficient and accessible heavy metal detection technologies.

Purpose of the Study:

  • To develop a peptide-based multichannel solid-state potentiometric microelectrode array.
  • To enable simultaneous detection of Cu2+, Cd2+, and Pb2+ ions.
  • To provide a miniaturized and reproducible platform for heavy metal analysis.

Main Methods:

  • Fabrication of a multichannel microelectrode array with gold indicator electrodes.
  • Functionalization of electrodes with distinct peptide receptors specific to target metal ions.
  • Potentiometric measurements for simultaneous heavy metal ion detection.

Main Results:

  • The array demonstrated near-Nernstian responses and high selectivity for target ions.
  • Successful analysis of spiked lake water samples with high recovery rates (94-105%).
  • The peptide-based recognition strategy proved effective and versatile.

Conclusions:

  • The developed microelectrode array offers a miniaturized, reproducible, and versatile platform for simultaneous potentiometric detection of multiple heavy metal ions.
  • The peptide-based recognition approach is adaptable for detecting other target analytes.
  • This technology presents a promising alternative to conventional analytical techniques for environmental monitoring.