EMISSION SPECTROSCOPY
Emission spectroscopy is exclusively related to
atoms whereas a number of other spectroscopic techniques deal with molecules. The fundamental fact of emission
spectroscopy is very simple, wherein the atoms present in a sample undergo
excitation due to the absorption of either electrical or thermal energy. Subsequently,
the radiation emitted by atoms in an excited sample is studied in an elaborated
manner both qualitatively and quantitatively. Therefore, emission spectroscopy
is considered to be an useful analytical tool for the analysis of :
(i) elemental
analysis of metals,
(ii)
identification and quantitative determination of metallic elements,
(iii)
estimation of metalloids e.g.,
arsenic, silicon, selenium, present is extremely low concentrations, and
(iv) analysis
of solids, liquids or gases as follows :
solids-as such or evaporated solutions,
liquids-atomized spray, analyzed occasionally, and
gases-analyzed rarely.
In short, emission spectroscopy is considered to be the
most accurate, precise and reliable means of quantitative analysis of elements
as on date. If proper skill, precautions and wisdom are applied together this
method may be adopted safely and conveniently to analyze approximately seventy
elements from the ‘periodic table’ at a concentration as low as 1
ppm.
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