PAMS on Rt-Alumina BOND/MAPD (by FID) and Rxi-624Sil MS (by MS) using Deans Switch

PeakstR (min)
1.Ethane7.68
2.Ethylene8.68
3.Propane10.36
4.Propylene15.58
5.Acetylene17.86
6.Isobutane7.19
7.trans-2-Butene7.84
8.n-Butane7.94
9.cis-2-Butene8.19
10.1-Butene8.61
11.Isopentane10.16
12.1-Pentene10.99
13.n-Pentane11.25
14.trans-2-Pentene11.82
15.Isoprene12.22
16.cis-2-Pentene12.28
17.2,2-Dimethylbutane13.19
18.2,3-Dimethylbutane15.03
19.2-Methylpentane15.15
20.Cyclopentane15.28
21.3-Methylpentane16.16
22.1-Hexene16.76
23.n-Hexane17.05
24.2,4-Dimethylpentane18.7
25.Methylcyclopentane18.94
26.Bromochloromethane19.86
27.2-Methylhexane20.56
28.Cyclohexane20.71
29.2,3-Dimethylpentane20.79
30.3-Methylhexane21
PeakstR (min)
31.Benzene21.39
32.2,2,4-Trimethylpentane21.63
33.n-Heptane22
34.1,4-Difluorobenzene22.3
35.Methylcyclohexane23.34
36.2,3,4-Trimethylpentane24.12
37.2-Methylheptane24.46
38.3-Methylheptane24.75
39.Toluene25.41
40.n-Octane25.55
41.Chlorobenzene-d527.83
42.Ethylbenzene27.98
43.n-Nonane28.11
44.m-Xylene28.17
45.p-Xylene28.17
46.o-Xylene28.76
47.Styrene28.78
48.Isopropylbenzene29.28
49.4-Bromofluorobenzene29.56
50.n-Propylbenzene29.86
51.1,2,3-Trimethylbenzene29.96
52.n-Decane30
53.p-Ethyltoluene30.01
54.1,3,5-Trimethylbenzene30.08
55.m-Ethyltoluene30.37
56.1,2,4-Trimethylbenzene30.6
57.o-Ethyltoluene31.16
58.m-Diethylbenzene31.34
59.p-Diethylbenzene31.48
60.n-Undecane31.52
61.n-Dodecane32.84
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GC_AR1173
ColumnRxi-624Sil MS, 60 m, 0.25 mm ID, 1.40 µm (cat.# 13869)
with zero dead volume Valco internal union (cat.# 20150)
SampleOzone precursor/PAMS mix (cat.# 26370)
Diluent:Air
Conc.:10 ppbv
Injectionon-column
Oven
Oven Temp.:35 °C (hold 7 min) to 60 °C at 3 °C/min to 170 °C at 10 °C/min to 250 °C at 30 °C/min (hold 6 min)
Carrier GasHe, constant flow
Flow Rate:2.0 mL/min
DetectorMS
Mode:Scan
Scan Program:
GroupStart Time
(min)
Scan Range
(amu)
Scan Rate
(scans/sec)
15.729-2263.7
Transfer Line Temp.:250 °C
Analyzer Type:Quadrupole
Source Type:Extractor
Source Temp.:230 °C
Quad Temp.:150 °C
Electron Energy:70 eV
Solvent Delay Time:5.7 min
Tune Type:BFB
Ionization Mode:EI
PreconcentratorMarkes Unity 2 + CIA
  Trap 1 Settings
Cooling temp.:5 °C
Desorb temp.:300 °C
Desorb flow:6 mL/min
Desorb time:180 sec
  Internal Standard
Purge flow:50 mL/min
Purge time:60 sec
Vol.:50 mL
ISTD flow:50 mL/min
  Standard
Size:400 mL
Purge flow:50 mL/min
Purge time:60 sec
Sample flow:100 mL/min
InstrumentAgilent 7890B GC & 5977A MSD
NotesDeans switch time: 6.489 min
Primary column to Deans switch: Rxi-624Sil MS 60 m x 0.25 mm x 1.40 μm (cat.# 13869), 2 mL/min He
Secondary column to FID: Rt-Alumina BOND/MAPD 30 m x 0.25 mm x 4 μm (cat.# 19781), 3 mL/min He
Transfer line to MS: intermediate-polarity deactivated 1 m x 0.1 mm (cat.# 10100), 3 mL/min He

FID Parameters
Temperature: 250 °C
H2 flow: 30 mL/min
Air flow: 400 mL/min
Makeup (N2) flow: 22 mL/min
Data rate: 5Hz
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