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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

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Precise Electrochemical Sizing of Individual Electro-Inactive Particles
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Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Published on: August 4, 2023

Automated electrochemical analysis with combinatorial electrode arrays.

M G Sullivan1, H Utomo, P J Fagan

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, and the Central Research and Development Department, E. I. Dupont de Nemours, Inc., Experimental Station, Wilmington, Delaware 19880-0328.

Analytical Chemistry
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

Two methods for screening electrochemical activity were developed. A computer-automated system precisely measures current, improving upon less precise fluorescent methods for modified electrode surfaces.

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Regeneration of Arrayed Gold Microelectrodes Equipped for a Real-Time Cell Analyzer
12:47

Regeneration of Arrayed Gold Microelectrodes Equipped for a Real-Time Cell Analyzer

Published on: March 12, 2018

Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Science

Background:

  • Rapid screening of electrochemical activity is crucial for developing new materials.
  • Existing fluorescent methods offer parallel screening but lack precision for subtle differences.
  • High-throughput electrochemical analysis requires precise and automated techniques.

Purpose of the Study:

  • To describe two combinatorial approaches for rapid, automated screening of electrochemical activity on modified electrode surfaces.
  • To compare the capabilities and limitations of a fluorescent screening method versus a computer-automated serial electrochemical measurement method.
  • To demonstrate the utility of precise electrochemical measurements for analyzing modified electrode surfaces.

Main Methods:

  • Development of a fluorescence-based method for simultaneous, pH-change-associated current comparison.
  • Implementation of a computer-automated, serial electrochemical measurement system for a 64-electrode array.
  • Application of the automated electrochemical method to gold electrode surfaces modified with organosulfur monolayers of varying chain lengths.

Main Results:

  • The fluorescence method allows simultaneous comparison but cannot distinguish small current differences.
  • The computer-automated serial electrochemical method precisely distinguishes small current differences between modified electrodes.
  • Demonstrated the capability of the automated method for analyzing organosulfur monolayers on gold surfaces.

Conclusions:

  • Computer-automated serial electrochemical measurement offers superior precision for analyzing modified electrode surfaces compared to fluorescence screening.
  • This precise method enables detailed examination of active zones identified by less precise screening techniques.
  • The described direct electrochemical measurement methodology is adaptable to various electrode materials, including fuel cell electrocatalysts and redox storage materials.