Page 16 - Shimadzu GCMS-QP2020 NX

Configure Optimal Analysis Systems to Meet Your Needs

For GC/MS analysis, different system configurations may be required depending on the application and HS-20 NX Headspace Analysis System
sample-introduction needs. The GCMS-QP2020 NX offers a wide variety of system configurations and
sample-introduction devices to enable an expanded range of applications.
High-Sensitivity Analysis of Fragrant Components in Coffee
(×1,000,000)
SMCI Unit 5.5 Aceticacid
5.0 Furfurylalchol
4.5 Pyridine
SMCI stands for Solvent Mediated Chemical Ionization, a soft ionization method for GCMS. The headspace reagent gas from the sample 4.0 Acetol Furfurylacetate
bottle is introduced into the GCMS ionization unit to be ionized, which then causes chemical ionization (CI) of the target molecule via 3.5 Methylpyrazine
protonation.* Previous CI methods have required the use of flammable reagent gas cylinders, but SMCI can be carried out with a general 3.0 2,5-Dimethylpirazine
2.5
organic solvent such as methanol or acetonitrile, together with nitrogen or argon gas. This results in greater safety and lower running costs. 2.0 Methylfuran
The HS-20 NX series of headspace samplers provides strong 1.5 ×5 to ×50
support for all volatile component analyses, for everything 1.0
from research to quality control. 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0
There is a loop model capable of static headspace analysis, Trace quantities of fragrant components undetectable with
and a trap model capable of trap headspace analysis. conventional headspace samplers can be qualified and quantified
by combining the high-sensitivity, electronically cooled trap with
GC-MS.

Aqueous VOC Analysis
(×1,000) Area ratio
(×100,000)
SMCI unit＋GCMS-QP2020 NX 6.0 88.00
7.5 58.00
SMCI can obtain the same results as previously existing CI methods, 5.0 57.00 5.0
but is less dependent on the compound. For example, it has been 4.0 5.0
difficult to verify the molecular weight of phthalate esters using EI 3.0
or previously existing CI method, whereas SMCI can identify the 2.0 2.5 2.5
quasi-molecular ions. 1.0
7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 0.0
* Patent pending 1. 1,1-dichloroethylene, 2. dichloromethane, 3. MTBE, 4. trans-1,2-dichloroethylene, 11.5 12.0 0 50 Concentration ratio
5. cis-1,2-dichloroethylene, 6. chloroform, 7. 1,1,1-trichloroethane, 8. carbon tetrachloride,
The mass spectrum of bis(2-ethylhexyl) 9. 1,2-dichloroethane, 10. benzene, 11. fluorobenzene (IS), 12. trichloroethylene, SIM Chromatogram (5 µg/L) and
DI-2010 Direct Inlet System phthalate (MW=390) obtained using different 13. 1,2-dichloropropene, 14. bromodichloromethane, 15. 1,4-dioxane-d8 (IS), 16. 1,4-dioxane, Calibration Curve (1 to 100 µg/L) of 1,4-Dioxane
17. cis-1,3-dichloropropene, 18. toluene, 19. trans-1,3-dichloropropene, 20. 1,1,2-trichloroethane,
ionization methods 21. tetrachloroethylene, 22. dibromochloromethane, 23. m,p-xylene, 24. o-xylene, 25. bromoform,
26. p-bromofluorobenzene (IS), 27. 1,4-dichlorobenzene
Direct sample injection (DI) is a method in which a sample is Analysis of a trace amount of volatile organic compounds can be performed with the loop mode.
injected directly into the ion source without passing through the
gas chromatograph (GC). This is an effective method for measur- % 158
ing the mass spectra of synthetic compounds, and can be used 100 EI
easily for the usual GC-MS configuration. By using this in 75
combination with Smart EI/CI ion source, EI and CI mass spectra 50 116 TD-30 Thermal Desorption System Sample
can easily be collected. 98
25
59
216 398 520 662 763
0
250 500 750
% Silica wool
100 CI 158 679 M+H +
838
75
116
50 Dibutyl phthalate
25 174 558
254 398 662 731
0 Thermal desorption systems heat samples in a sample
250 500 750
Mass Spectrum for Antibiotic Roxithromycin tube and then concentrate the thermally desorbed
Components that are thermally degradable or difficult to vaporize are not suited gases before injection into a GC-MS. They are
to GC analysis. Their mass spectra can be obtained easily using the DI probe. commonly used to measure volatile organic
compounds (VOCs) in the atmosphere or measure SVOC
OPTIC-4 Multimode Sample Inlet System trace components that are generated from plastic or
other samples. VOC
The TD-30R can accommodate 120 samples for
The OPTIC-4 multimode sample inlet is a GC injection port that excellent processing capacity and offers outstanding Analysis of Gas Produced by Rubber
enables a variety of sample injection modes for GC-MS, including expandability, such as functionality for retrapping
large-quantity injection, inlet derivatization, thermal desorption, components or for automatically adding an internal
and DMI (difficult matrix introduction). standard substance.
Combining this with an autosampler enables automatic replace-
ment of inserts, improving productivity in multisample analyses.

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