Discussion
Which flame is used for most routine determinations?
Answer: A
Air-acetylene at about 2300 degrees atomises most metals adequately and is cheap, safe and stable, which is why it is the default. The hotter nitrous oxide flame is reserved for refractory elements that air-acetylene cannot break down. Air-hydrogen has a low background but is cooler still, and oxygen-acetylene burns too fast to be safe on a burner of this kind. Choosing the coolest flame that does the job keeps ionisation and background low. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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