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 ?
45 Flame Test ASTM D1230-94 is the standard test method used for testing flammability of apparel textiles.
A flame test was performed on the sample, giving a bright yellow/orange flame in which the sample was not consumed.
Will Kwan's installation, Flame Test, at the Scandinavian Hotel, above; and, left, Liverpool Biennial curator Lorenzo Fusi Pictures: JAMES MALONEY/ jm310810flags-7, above, and jm310810flags-15, left The 36 flags depict images of flags being set alight, taken from news agency archives Code: jm310810flags-4
In addition, the 250V and 1 kV BFOU-HCF series, which contain a mica glass tape, pass both the IEC 60331-21 gas flame test for a minimum of 90 minutes at 750[degrees]C as well as IEC 60331-31 with hammer shock for 120 minutes at 850[degrees]C without short circuiting.
It is essential that fabrics pass the Vertical Flame Test ASTM 191 A Method 5903, which measures the char length and after flame before and after 25 launderings.
Upholstery fabrics could be made to pass a 20-second open flame test, most commonly through the use of flame retardant chemicals.
Horizontal flame test according to the UL-94 standard proved the role of expandable graphite filler as an environmentally friendly halogen-free flame retardant.
Innovative filter technology allows the A2 material to pass the aircraft radiant panel flame test, FAR25.
The sheathing material passed the VW-1 vertical flame test with minimum layer thicknesses.
5 inches), and 5 x 30 to 84 inches for the large flame test (11 inches high).