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Chapter 22: Q1TY (page 564)

Measure the resolving power m/m1/2from the 31Ppeak in Figure 22 10.

Short Answer

Expert verified

The resolving power m/m1/2= 30974/0.003 = 9400

Step by step solution

01

Resolving power:

The ability of an optical instrument or type of film to separate or distinguish small or closely adjacent images is call resolving power.

02

calculating resolving power:

The width at half-height is 0.0033 m/z units. Therefore,

Resolving power = mm1/2=30.9740.0033= 9 400

An instrument with a resolving power of 9 400 separates peaks well.

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Most popular questions from this chapter

(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?

Explain what is meant by spectral, chemical, ionization, and isobaric interference.

The molecular ion region in the mass spectrum of a large molecule, such as a protein, consists of a cluster of peaks differing by 1 Da. This pattern occurs because a molecule with many atoms has a high probability of containing one or several atoms of C1315N,18O,2Hand 32S. In fact, the probability of finding a molecule with only C1214N,16O,1Hand 32S may be so small that the nominal molecular ion is not observed. The electrospray mass spectrum of the rat protein interleukin-8 consists of a series of clusters of peaks arising from intact molecular ions with different charge. One cluster has peaks at m/z 1 961.12, 1 961.35, 1 961.63, 1 961.88, 1 962.12 (tallest peak), 1 962.36, 1 962.60, 1 962.87, 1 963.10, 1 963.34, 1 963.59, 1 963.85, and 1 964.09. These peaks correspond to isotopic ions differing by 1 Da. From the observed peak separation, fi nd the charge of the ions in this cluster. From m/z of the tallest peak, estimate the molecular mass of the protein.

(a) To detect the drug ibuprofen by liquid chromatography鈥� mass spectrometry, would you choose the positive or negative ion mode for the spectrometer? Would you choose acidic or neutral chromatography solvent? State your reasons.

(b)If the unfragmented ion has an intensity of 100, what should be the intensity of M+1?

Explain what is meant by spectral, chemical, ionization, and isobaric interference.
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