2. Gas chromatography-mass spectrometry was used to measure the components of a

Question

2. Gas chromatography-mass spectrometry was used to measure the components of a spill at an accident site. Figure (a) shows the total ion chromatogram and figure (b) shows the selected ion chromatogram of m/z 78 (the molecular ion of benzene). What are the benefits of selected ion monitoring?
2. Gas chromatography-mass spectrometry was used to measure the components of a spill at an accident site. Figure (a) shows the total ion chromatogram and figure (b) shows the selected ion chromatogram of m/z 78 (the molecular ion of benzene). What are the benefits of selected ion monitoring? m and p-Xylene 100C

Explanation / Answer

Selected ion monitoring (SIM) is used to increment the senstivity of mass spectrum by focussing of only a select number of ions of each analyte in a mixture.

The usefulness of SIM MS or mass spectroscopy lies in fact that it makes the detector to spend more time on specific ion's m/z values which in turn also provides more simple mass spectrum .

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