How do I interpret this mass spec graph in order to determine the identity from the list of unknowns below? Intensity90-80-70-6050-403020100TTTTSpectrum RT 0.55-0.59 (3 scans}UNKNOWN 5-b_Scan1_isl.datx 2019.07.3013:09:52 ; APCI + Max: 1.6E8100149.0181.0200260.9274.127B.1262.0300355.0; [M+H]+356.1369.1357.1400500600700myz List of potential dye unknownsDyeCrystal violetMethylene blueMethyl violetMethyl yellowNaphthanil red G baseRosanilineBromocresol greenBromophenol blueFluoresceinMethyl orangeMethyl redIndigoBromocresol purpleMalachite greenRose BengalTartrazinePhenol redMolecular formula of parentC25H30N3C16H18N3SC24H27N3C14H15N3C7H8N202C19H17N3C21H14Br405SC19H10Br405SC20H1205C14H14N303SC15H15N302C16H10N202C21H16Br205SC23H25N2C20H4C141405C16H9N409S2C19H1405SExact mass372.2284.1357.2225.1152.1287.1697.7669.7332.1304.1269.1262.1537.9329.2971.5465.0354.4With counter-ion or salt407.2 (CI)319.1 (Cl)393.2 (HCI)323.1 (HCI)327.1 (Na+)364.2 (Cl)534.0 (3 Nat)

Mass spectrometry is a spectroscopic technique for the determination of the molar mass of a…

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How do I interpret this mass spec graph in order to determine the identity from the list of unknowns below?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter32: Gas Chromatography

Section: Chapter Questions

Problem 32.11QAP

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Concept explainers

Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

How do I interpret this mass spec graph in order to determine the identity from the list of unknowns below?

Intensity
90-
80-
70-
60
50-
40
30
20
10
0
TTTT
Spectrum RT 0.55-0.59 (3 scans}
UNKNOWN 5-b_Scan1_isl.datx 2019.07.30
13:09:52 ; APCI + Max: 1.6E8
100
149.0
181.0
200
260.9
274.1
27B.1
262.0
300
355.0; [M+H]+
356.1
369.1
357.1
400
500
600
700
myz

List of potential dye unknowns
Dye
Crystal violet
Methylene blue
Methyl violet
Methyl yellow
Naphthanil red G base
Rosaniline
Bromocresol green
Bromophenol blue
Fluorescein
Methyl orange
Methyl red
Indigo
Bromocresol purple
Malachite green
Rose Bengal
Tartrazine
Phenol red
Molecular formula of parent
C25H30N3
C16H18N3S
C24H27N3
C14H15N3
C7H8N202
C19H17N3
C21H14Br405S
C19H10Br405S
C20H1205
C14H14N303S
C15H15N302
C16H10N202
C21H16Br205S
C23H25N2
C20H4C141405
C16H9N409S2
C19H1405S
Exact mass
372.2
284.1
357.2
225.1
152.1
287.1
697.7
669.7
332.1
304.1
269.1
262.1
537.9
329.2
971.5
465.0
354.4
With counter-ion or salt
407.2 (CI)
319.1 (Cl)
393.2 (HCI)
323.1 (HCI)
327.1 (Na+)
364.2 (Cl)
534.0 (3 Nat)

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