Answer to Question #104281 in Chemistry for Neha Singh

Question

Write the principle involved in chemiluminescence and spectrometry for air pollutant determination. Also state the pollutants which can be analysed using these methods.​

Answer 1

Chemiluminescence (also chemoluminescence) is the emission of light (luminescence), as the result of a chemical reaction. There may also be limited emission of heat. Given reactants A and B, with an excited intermediate ◊,

[A] + [B] → [◊] → [Products] + light

For example, if [A] is luminol and [B] is hydrogen peroxide in the presence of a suitable catalyst we have:

{\displaystyle {\ce {{\underset {luminol}{C8H7N3O2}}+{\underset {hydrogen\ peroxide}{H2O2}}->3-APA[\lozenge ]->{3-APA}+light}}} {\displaystyle {\ce {{\underset {luminol}{C8H7N3O2}}+{\underset {hydrogen\ peroxide}{H2O2}}->3-APA[\lozenge ]->{3-APA}+light}}}

where:

3-APA is 3-aminophthalate

3-APA[◊] is the vibronic excited state fluorescing as it decays to a lower energy level.