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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 · 2021 · Mains Paper III

Q5(d). Peristaltic pump in ICP spectroscopy

Question

Mention the utility of peristaltic pump in Inductively Coupled Plasma (ICP) spectroscopy.

Answer in brief

It delivers the sample solution to the nebuliser at a constant, known rate whatever its viscosity or salt content, drains the spray chamber and adds internal standard on line: steady signal, better precision.

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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: X-ray methods and ICP (Bragg's law, powder XRD, XRF, ICP torch, ICP-MS interferences), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversperistaltic pumpICP sample introductionnebuliserinternal standard

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