# Clark electrode

> electrode measuring the oxygen partial pressure in a solution

**Wikidata**: [Q491332](https://www.wikidata.org/wiki/Q491332)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Clark_electrode)  
**Source**: https://4ort.xyz/entity/clark-electrode

## Summary
The Clark electrode is a specialized type of electrode designed to measure the oxygen partial pressure in a solution. Named after its inventor, Leland Clark, it is classified as a measurement electrode and serves as a critical sensor in medical and analytical diagnostics.

## Key Facts
- **Definition**: An electrode that measures the oxygen partial pressure in a solution.
- **Parent Class**: Subclass of **Electrode** (an electrical conductor used to make contact with a nonmetallic part of a circuit).
- **Named After**: Leland Clark.
- **Aliases**: Clark-type electrode, Clark-Sensor, Clark-Messzelle, électrode à oxygène, Sauerstoffelektrode, Sauerstoff-Elektrode.
- **Category**: Measurement Electrode (specifically cited for medical diagnostics).
- **Wikipedia Title**: Clark electrode.
- **Freebase ID**: /m/06h60_.
- **Microsoft Academic ID**: 77926170 (discontinued).
- **Commons Category**: Clark electrodes.
- **Wikipedia Languages**: Available in ar, commons, de, en, es, it, nl.

## FAQs

### What is a Clark electrode used for?
A Clark electrode is used to measure the partial pressure of oxygen in a solution. It is widely recognized in the medical field for diagnostic applications involving oxygen monitoring.

### Who is the Clark electrode named after?
The Clark electrode is named after **Leland Clark**, an American scientist known for his contributions to biomedical engineering.

### How does the Clark electrode relate to other types of electrodes?
The Clark electrode is a specific subclass of the general "electrode," which is defined as an electrical conductor making contact with a nonmetallic part of a circuit. It falls specifically under the category of measurement electrodes, alongside others like the Severinghaus electrode (which measures carbon dioxide) and the Hydrogen electrode.

### What is the operational principle of an electrode?
As an electrode, the Clark device functions as an electrical conductor used to make contact with a nonmetallic part of a circuit, such as an electrolyte. It acts as a terminal for current to enter or leave the nonmetallic conducting medium.

## Why It Matters
The Clark electrode is significant because it enables the precise quantification of oxygen levels in liquid environments, a critical capability in medical diagnostics and physiological research. By functioning as an interface between metallic conductors and electrolytes, it allows healthcare professionals and researchers to monitor respiratory function and metabolic processes. It is a prime example of how specialized electrodes facilitate the transfer of electrical current to measure chemical activities, a fundamental requirement in modern medical technology and electrochemistry.

## Notable For
- Being the standard electrode type for measuring oxygen partial pressure in solutions.
- Being named after inventor Leland Clark.
- Classification as a "Measurement Electrode" alongside the Severinghaus electrode (CO2) and Hydrogen electrode.
- Serving as a key application of general electrode technology in the medical and diagnostic field.
- Acting as an electrical conductor interface with electrolytes to perform specific chemical measurements.

## Body

### Definition and Function
The Clark electrode is defined as an electrode specifically designed for measuring the oxygen partial pressure in a solution. It falls under the broad classification of an **electrode**, which is an electrical conductor used to make contact with a nonmetallic part of a circuit (such as a semiconductor, an electrolyte, or a vacuum). In the context of the Clark electrode, the device acts as a terminal for current to enter or leave a nonmetallic conducting medium, typically an electrolyte, to detect oxygen levels.

### Etymology and Nomenclature
The entity is named after **Leland Clark**. It is recognized globally under various names and aliases, including:
- **Clark-type electrode**
- **Clark-Sensor**
- **Clark-Messzelle**
- **électrode à oxygène** (French)
- **Sauerstoffelektrode** (German)
- **Sauerstoff-Elektrode** (German)

### Classification and Hierarchy
The Clark electrode is a **subclass of electrode**. Within the taxonomy of electrodes, it is categorized as a **Measurement Electrode**. This category includes other specialized sensors such as:
- **Severinghaus electrode**: Measures carbon dioxide.
- **Hydrogen electrode**: A platinized platinum electrode saturated by a stream of pure gaseous hydrogen.

Other general categories of electrodes (distinct from the Clark type but part of the same parent class) include:
- **Vacuum Tube Electrodes**: Such as control grids, dynodes, and plate electrodes.
- **Electrochemistry Electrodes**: Including working, reference, and inert electrodes.
- **Specialized Electrodes**: Such as microelectrodes and ion selective electrodes.

### Technical Context and Component Relationships
As an electrode, the Clark electrode shares the fundamental properties of its parent class. It serves as a component of electrochemical cells and connects with electrolytes. General electrodes are integral to devices such as transistors, vacuum tubes, and gas-filled tubes, and are described by standard identifiers such as the Library of Congress Authority ID (sh85042110) and GND ID (4014247-4).

### Identifiers and Metadata
The Clark electrode is indexed under several authority and knowledge base systems:
- **Freebase ID**: /m/06h60_
- **Microsoft Academic ID**: 77926170 (Note: this service is discontinued).
- **Wikipedia Title**: Clark electrode.
- **Wikidata Description**: "electrode measuring the oxygen partial pressure in a solution."
- **Wikipedia Language Coverage**: ar, commons, de, en, es, it, nl.

## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)