Voltameter

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voltameter

[väl′tam·əd·ər]

(physical chemistry)

Voltameter

a device for measuring the quantity of electricity according to the chemical activity of a current. The voltameter is a platinum crucible (cathode) filled with a 20-40 percent water solution of silver nitrate into which a rod or disk of chemically pure silver (anode) is submerged. When an electric current is passed through the voltameter, the silver is deposited on the inner surface of the crucible (there is also a separating glass for particles of silver and accidental impurities which precipitate out mechanically). The quantity of electricity is determined according to the weight of the crucible before the experiment gl and after the experiment g₂:

(m is the electrochemical equivalent). The voltameter is rarely used, having been practically replaced by ampere-clock calculators. If the time the electric current takes to pass through the voltameter is known, it is possible to determine its average value.

Mentioned in ?

coulometer

References in periodicals archive ?

Tenders are invited for Transformer Rectifier Capacity 110V/24V/2 Amps With Voltameter And Ammeter Specn/Irs-91/93

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The acquisitions also included Princeton Applied Research, which makes and sells electrochemical research instrumentation such as analytical voltameters and potentiostats, and which expanded AMTEK's products for the laboratory as well as life sciences.

Ametek expands to fill niches

In 1989-1990, Zn, Cd, Pb, and Cu were determined with the use of anodic stripping voltametry (Voltameters UPE-3 and MAW-1, Poland), which made it possible to perform all analyses directly on unconcentrated water samples.

The dynamics of chemical elements in forest litter

The measurement of various qualitative characteristics, however, generally requires instruments such as weighing machines, gauges, thermometers, voltameters or magnetometers.

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The electrochemistry group is comprised of pH and ISE electrodes and meters, titrators, oxygen analyzers (DO/ COD/BOD) and polarographs and voltameters. Sales of these techniques are expected to expand 3.3% in 2003, and perhaps do as well as 4.5% in 2004.