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Flameless Aa Vs Graphite Furnace

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Flameless AA(Graphite Furnace):
It is used exclusively for atomic absorption . An electrically heated . graphite furnace has several advantages over a flame. First it accept solutions or solid samples.it requires less sample amount and more sensitive than a flame .We need at least 1 to 100 μL of sample solution to injected into the furnace through the hole at the center. Ar gas is passed over the furnace to prevent oxidation of the graphite, and the maximum recommended temperature is 2550 K for not more than 7 s.

we have three step for heated the wall of the tube Low temp for drying the sample , then the wall is heated up to 1400 K for short period to ash the sample, then up to 2550 K for few seconds to produce gas phase atoms.
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