Discussion
Gas used as fuel in Atomic Absorption spectrometry is :
Answer: C
The fuel gas in flame atomic absorption spectrometry is acetylene.
In flame AAS the sample is sprayed into a flame that atomises it. The usual flame burns acetylene with air at about 2300 °C; for elements that form refractory oxides, such as aluminium, acetylene is burnt with nitrous oxide, which gives a hotter flame of about 2700 °C.
In both cases acetylene is the fuel. Air and nitrous oxide are the oxidants that support its combustion, not fuels. Nitrogen does not burn; it is used as an inert gas, for example as a purge gas.
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