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Different types of spectroscopy use different measurement
processes:
Absorption Spectroscopy uses the range
of electromagnetic spectra in which a substance absorbs. It
is more commonly used. The sample is vaporised and then light
of a particular frequency is passed through the vapour. After
calibration, the amount of absorption can be related to the
concentrations of various metal ions. The method can be automated
and is widely used to measure concentrations of ions such
as sodium and calcium in blood. ( Atomic Absorption Spectroscopy
)
Emission Spectroscopy uses the range of
electromagnetic spectra in which a substance radiates. It
requires the substance to be vaporised at high temperatures
by placing it in a spark gap.
Source: WIKIPEDIA
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