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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper III

Q4(b). Interferences in flame photometry and their elimination

Question

List out the interferences in flame photometry and describe the ways to eliminate at least two of them.

Answer in brief

Spectral, ionisation, chemical (anion), self-absorption and physical interferences. Cures: CsCl buffer for ionisation; La³⁺ or EDTA for phosphate on calcium.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: spectroscopic instruments (Beer–Lambert law, UV–vis and IR instruments, Job's method, AAS and flame emission), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversflame photometryionisation interferencechemical interferencereleasing agentionisation suppressorinternal standard

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