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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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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...
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Voltammetry: Overview01:20

Voltammetry: Overview

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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
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Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
2.7K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.3K
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...
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Related Experiment Video

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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing
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Voltammetric pH sensor based on an edge plane pyrolytic graphite electrode.

Min Lu1, Richard G Compton

  • 1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK. richard.compton@chem.ox.ac.uk.

The Analyst
|March 28, 2014
PubMed
Summary
This summary is machine-generated.

A novel pH sensor uses unmodified edge plane pyrolytic graphite (EPPG) electrodes for accurate measurements across a wide pH range. This robust, reagent-free sensor exhibits Nernstian behavior, making it ideal for various applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Accurate pH determination is crucial in various scientific and industrial fields.
  • Developing simple, robust, and reagent-free pH sensing materials remains an active area of research.

Purpose of the Study:

  • To report a simple sensor for pH determination using unmodified edge plane pyrolytic graphite (EPPG) electrodes.
  • To characterize and optimize the EPPG electrode for pH sensing applications.

Main Methods:

  • Utilized cyclic voltammetry (CV) for characterization of surface quinone groups on EPPG.
  • Employed square-wave voltammetry (SWV) for optimization of the pH sensing performance.
  • Investigated the electrochemical response over a wide aqueous pH range (1.0 to 13.0).

Main Results:

  • Demonstrated electro-reduction of surface quinone groups on EPPG electrodes.
  • Observed a linear relationship between peak potential and pH under optimized conditions.
  • Achieved a gradient of approximately 59 mV per pH at 25 °C, consistent with Nernstian behavior (2 proton, 2 electron system).

Conclusions:

  • Unmodified EPPG electrodes serve as a viable material for pH sensing.
  • The developed EPPG-based sensor is reagent-free, robust, and exhibits excellent Nernstian characteristics.
  • This sensor offers a promising alternative for accurate and simple pH determination.