flame test

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flame test,

test used in the identification of certain metals. It is based on the observation that light emitted by any element gives a unique spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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 when passed through a spectroscope. When a salt of the metal is introduced into a Bunsen burner flame, the metallic ion produces characteristic color in the flame. Some metals and the colors they produce are: barium, yellow-green; calcium, red-orange; copper salts (except halides), emerald green; copper halides or other copper salts moistened with hydrochloric acid, blue-green; lithium, crimson; potassium, violet; sodium, yellow; and strontium, scarlet. The value of this simple flame test is limited by interferences (e.g., the barium flame masks calcium, lithium, or strontium) and by ambiguities (e.g., rubidium and cesium produce the same color as potassium). A colored glass is sometimes used to filter out light from one metal; for instance, blue cobalt glass filters out the yellow of sodium.
References in periodicals archive ?
To verify this hypothesis, oven and flame tests were designed and conducted to verify the viability of Cerakote as a coating material for the engine cowling and enable us to find the best painting scheme.
They pass UL 94 V-0 rating at 0.060 inch and meet VW-1 and method 1061 wire and cable flame tests without dripping.
Today's electronic assemblies seldom are subjected to direct flame tests, but dust and salt spray are among the many types of environmental tests often applied, especially when qualifying mil/aero and automotive equipment.
It maintains its usefulness during exposure to cobalt 60 radiation at dosages of 200 Mrads, withstands cryogenic to 300[degrees]F temperatures, and meets the fire requirements of UL-94 V-0 vertical flame tests. Additional advantages include lower permeation rates, superior surface finish, improved welding and cost efficiency.
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Magnetic properties, density - and even the shape and colour of sparks formed by application of a grinding wheel, as well as flame tests, can all give important information.
During flame tests it was discovered that sodium silicate formed a foam-like material, and this material was found to have become water insoluble, yet its elemental composition had remained virtually identical to that of the unmodified sodium silicate.
Cables 1/0 and larger pass UL 1685 and IEEE 383 vertical tray flame tests and are listed for installation in cable trays.
Medford showed videos of flame tests on cotton, cotton blend and leather upholstery and dust covers.
In lessons, students explored new concepts in each branch, such as Space, Plant Biology and Flame Tests. Older students took part in dissections, of both plants and organs.
Properties include low specific gravity; no degradation of physical properties of base polymer; long-term thermal and uv protection; non-yellowing and non-blooming; no heavy metals; no forming of dioxins when heated or incinerated; passing UL, MVSS-302 and NFPA flame tests when properly formulated.
The 11 to 14-year-old school pupils from across the North West took part in the annual Salters' Festival of Chemistry which involved the use of flame tests to solve the murder mystery devised by experts at the university.