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Why is the furnace slower than a flame?

  • A.The furnace requires a longer warm-up before use
  • B.The lamp takes longer to stabilise on a furnace
  • C.The furnace tube must be replaced between samples
  • D.Each sample needs a full heating programme

Answer: D

Drying, ashing, atomising and cleaning take a couple of minutes per determination against a few seconds for a flame aspiration. Warm-up, lamp stabilisation and tube life are secondary. Trading throughput for sensitivity is the choice between the two atomisers, and which way to take it depends on whether the samples are few and difficult or many and straightforward.

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