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Chapter 22: Q10P (page 600)

(a) Explain the purpose of the dynamic reaction cell inFigure 21-30.(b) In geologic strontium isotopic analysis, there is isobaric interference betweenRb+87and Sr+87 . A dynamic reaction cell with CH3Fconverts Sr+ to SrF+ but does not convertRb+to RbF+. Howdoes this reaction eliminate interference?

Short Answer

Expert verified

(a)A dynamic reaction cell reduces isobaric interference by performing athermodynamically favourable reaction with a gas such as NH3, N2O or CO to remove interfering molecular ions like ArO+ .

(b)When Sr+87 reacts with CH3F to generate Sr1987Fe, which has a mass of 106 , the mass spectrum does not overlap with 87Rb .

Step by step solution

01

Define isotopic interference.

Isotopic interference occurs when two isotopes in a sample solution have the same mass but are from different elements.

02

Explain the elimination of the interference in the given reaction.

(a)

A dynamic reaction cell reduces isobaric interference by performing athermodynamically favourable reaction with a gas such as NH3, N2O or CO to remove interfering molecular ions like ArO+ or convert analyte into a molecular ion that can be detected without interference.

(b)

When Sr+87 reacts with CH3F to generate Sr1987Fe, which has a mass of 106 , the mass spectrum does not overlap with 87Rb .

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