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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 · 2023 · Mains Paper III

Q5(b). Analysis of a solid sample by ICP–MS: sequence of steps

Question

Briefly describe the sequence of steps involved in analyzing a solid sample by ICP-MS.

Answer in brief

Dissolve the solid (acid digestion or fusion), nebulise into the argon plasma (ionised to M⁺), extract the ions through the cones into vacuum, sort by m/z and count.

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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 →

CoversICP-MSsample digestionlaser ablationquadrupole mass analysersampler and skimmer cones

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