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Cadmium


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Atomic Number:48Atomic Symbol:Cd
Atomic Weight:112.40Electron Configuration:2-8-18-18-2
Shells:2,8,18,18,2Filling Orbital:4d10
Melting Point:320.9oCBoiling Point:765oC
Description:Silvery White Metal
Uses:Obtained as a byproduct of Zinc Refining

History

(L. cadmia; Gr. kadmeia - ancient name for calamine, zinc carbonate) Discovered by Stromeyer in 1817 from an impurity in zinc carbonate.

Sources

Cadmium most often occurs in small quantities associated with zinc ores, such as sphalerite (ZnS). Greenockite (CdS) is the only mineral of any consequence bearing cadmium. Almost all cadmium is obtained as a by-product in the treatment of zinc, copper, and lead ores.

Properties

  • It is a soft, bluish-white metal which is easily cut with a knife.
  • It is similar in many respects to zinc.

Uses

  • It is a component of some of the lowest melting alloys; it is used in bearing alloys with low coefficients of friction and great resistance to fatigue; it is used extensively in electroplating, which accounts for about 60% of its use.
  • It is also used in many types of solder, for standard E.M.F. cells, for Ni-Cd batteries, and as a barrier to control nuclear fission. Cadmium compounds are used in black and white television phospros and in blue and green phosphors for color TV tubes.
  • It forms a number of salts, of which the sulfate is most common; the sulfide is used as a yellow pigment.

Handling

Cadmium and solutions of its compounds are toxic.
Failure to appreciate the toxic properties of cadmium may cause workers to be unwittingly exposed to dangerous fumes.
Silver solder, for example, which contains cadmium, should be handled with care.
Serious toxicity problems have been found from long-term exposure and work with cadmium plating baths.
Exposure to cadmium dust should not exceed 0.01 mg/m^3 (8-hour time-weighted average, 40-hour week).
The ceiling concentration (maximum), for a period of 15 min, should not exceed 0.14 mg/m^3.
Cadmium oxide fume exposure (8-hour, 40-hour week) should not exceed 0.05 mg/m^3, and the maximum concentration should not exceed 0.05 mg/m^3.
These values are presently being restudied and recommendations have been made to reduce the exposure.
In 1927 the Interanational Conference on Weights and Measures redefined the meter in terms of the wavelength of the red cadmium spectral line (i.e. 1m = 1.553,164.13 wavelengths).
This definition has since been changed (see under Krypton).

Costs

The current price of cadmium is about $12/lb.
It is available in high purity form.

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