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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.1K
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...
2.1K
Electrical Conductivity01:13

Electrical Conductivity

1.9K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
1.9K
Electrodes: Overview01:17

Electrodes: Overview

2.8K
 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
2.8K
Standard Electrode Potentials03:02

Standard Electrode Potentials

50.7K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
50.7K
Electrodeposition01:08

Electrodeposition

1.6K
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...
1.6K
Resistivity01:22

Resistivity

4.6K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.6K

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Updated: Feb 18, 2026

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
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Low Electrolytic Conductivity Standards.

Yung Chi Wu1, Paula A Berezansky1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.

Journal of Research of the National Institute of Standards and Technology
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

New standards for low electrolytic conductivity measurements were developed for high-quality water analysis. These standards, using potassium chloride and benzoic acid, meet U.S. Navy and industry needs for accurate water purity testing.

Keywords:
Onsager limiting lawbenzoic aciddielectric constantelectrolytic conductivitylow conductivity standardnonaqueous solventpotassium chloride

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Accurate measurement of high-quality water conductivity is crucial for U.S. Navy and industrial applications.
  • Existing standards may not adequately address the demands for precise low conductivity measurements.

Purpose of the Study:

  • To develop and characterize reliable standards for low electrolytic conductivity measurements.
  • To establish criteria for selecting appropriate solvents and solutes for conductivity standards.

Main Methods:

  • Utilized principles of equivalent conductivity and Onsager's limiting law for solvent and solute selection.
  • Prepared and analyzed dilute solutions of potassium chloride and benzoic acid in 30% n-propanol-water.
  • Determined electrolytic conductivity as a function of molality for prepared solutions.

Main Results:

  • Recommended potassium chloride and benzoic acid solutions for use as conductivity standards at 5, 10, 15, 20, and 25 μS/cm.
  • Certified specific solutions as Standard Reference Materials (SRMs): SRM 3198 (5 μS/cm) and SRM 3199 (15 μS/cm) at 25.000 °C.
  • Established a methodology for developing new conductivity standards.

Conclusions:

  • Developed validated low electrolytic conductivity standards suitable for demanding applications.
  • The new standards provide reliable reference points for accurate water quality assessment.
  • Certified SRMs offer traceable and dependable measurements for critical industrial and military needs.