Oak Wood — Evolved Gas Analysis (GC-MS)

TG-DTG-T plot of oak wood, 4.37 mg, N2, event-controlled triggering of the GC-MS run at 291°C and at 347°C (DTG threshold 8 %/min; temperature stops until GC-MS run is finished). Detailed analysis of the gas composition is achieved by the GC furnace program: isothermal 60°C for 0.5 min, linear heating to 310°C at 25 K/min.

Total Ion Chromatogram for the first step of oak wood pyrolysis, with library search result for the main peaks (table listed in ascending order of retention times (RT/min)).

RTArea / %Best hit (NIST/Wiley)
1.1572.276H,8H-Benzopyrano[3,4-b]benzopyran
1.3568.96Acetic acid
1.3568.961-Penten-3-ol
2.25326.67Furfural
2.5511.65Thiazole
3.1081.961-methyl-1-silacyclohexane
3.24314.863-Methyl Hydantoin
6.8811.70Benzenamine, N-methyl-N-phenyl-
9.15616.972-Isopropyl-10-methylphenanthrene
9.2099.01Phenanthrene, 1-methyl-7-(1-methylethyl)-
9.2981.42Benzene, 1-methyl-4-[(4-propylphenyl)ethynyl]-

Total Ion Chromatogram for the second step of oak wood pyrolysis, with library search result for the main peaks (table listed in ascending order of retention times (RT/min)).

RTArea / %           Best hit (NIST/Wiley)
1.1577.72
[2-(4-Dimethylaminocinnamoyl)-5-me thylphenoxy]difluoroborane
1.4086.83
Furan, 2-methyl-
1.6811.70
Furan, 2,5-dimethyl-
2.25821.28
Furfural
2.3577.37
2-Furanmethanol
3.0337.80
2-Furancarboxaldehyde, 5-methyl-
3.1282.91
2-Amino-3-hydroxypyridine
3.8202.81
Phenol, 2-methoxy-
3.9722.19
Levoglucosenone
4.4441.63
2-Methoxy-5-methylphenol
5.3353.73
Phenol, 2,6-dimethoxy-
6.8972.03
Benzenamine, 4-(phenylmethyl)-
9.20912.26
Phenanthrene, 1-methyl-7-(1-methylethyl)-
9.3402.72
Benzene, 1-methyl-4-[(4-propylphenyl)ethynyl]-
TGA/STA-GC-MS Coupling

NETZSCH, in collaboration with JAS (Joint Analytical Systems), has forged a breakthrough improvement in evolved gas analysis (EGA). What sets the new coupling system apart is the fact that the start of the measurement is event-driven. This enables temperature-correlated detection of the substances released, which in turn allows for direct correlation with mass loss steps.