Incandescent tube sample

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The glow tube sample is a qualitative analytical method in inorganic chemistry.

It is used for the qualitative detection of metals in volatile metal compounds such as cadmium and arsenic .

The substance to be examined is heated to a high temperature in a refractory test tube . The metal compound is decomposed or sublimed by the high temperature . The metal is reflected by resublimation as a metal mirror on the relatively colder upper edge of the test tube. The metallic coating can be weighed and taken from the test tube for closer examination.

Because of the vapors that are generated during the incandescent tube sample, which can be toxic or harmful to health (in particular due to cacodyl or cacodyloxide in the case of arsenic detection), this detection reaction should be carried out under a gas vent .

See also

Marsh's sample for the quantitative detection of arsenic and antimony.

literature

  • Eberhard Gerdes: Qualitative Inorganic Analysis. A companion for theory and practice . 2nd corrected and revised edition. Reprint (1998 edition). Springer-Verlag, Berlin et al. 2001, ISBN 3-540-67875-1 .