Page 7 - Shimadzu GCMS-QP2020 NX

Reduced Operating Costs Using Alternative Carrier Gases Application Example Using Nitrogen as the Carrier Gas
Hydrogen and nitrogen are less expensive than helium and are readily available, so they are attracting attention as The use of helium as the carrier gas is a major contributor to instrument
alternative carrier gases. The high-performance Advanced Flow Controller (AFC) provides accurate control even with operating costs.
hydrogen and nitrogen. In addition, the new large-capacity differential exhaust system enhances the vacuum Nitrogen is approximately 10 times less expensive than helium, so
performance when hydrogen or nitrogen is used as the carrier gas, so the optimal MS state is achieved under all significant reductions in operating costs can be expected by utilizing He N2
carrier gas conditions. nitrogen as the carrier gas.

(×1,000)
Application Example Using Hydrogen as the Carrier Gas %RSD = 2.63
Hydrogen and nitrogen provide less sensitivity than helium. 5.0 He
However, chromatogram patterns equivalent to when helium is He H2
used can be obtained by using a short column with a narrow
internal diameter. EZGC Method Translator* , a method 2.5 H2
1
®
conversion program provided by Restek, can convert the analysis
conditions when helium is used to the optimal analysis conditions 0.0
for the alternative carrier gas. N2
(×1,000)
%RSD = 3.74
(×10,000) (×100)
191.00 8.0 272.00 1 pg 10 pg 100 pg 1 ng 10 ng
2.00 1.5
193.00 274.00
7.0
1.75
Indication of Measurement Range for Each Carrier Gas
1.50 6.0 1.0 (On-Column Amount)
1.25 These measurement ranges are at best only guidelines, and may be
5.0
1.00 unsuitable depending on the target compound sensitivities and the
0.5
0.75 4.0 compound characteristics.
0.50
3.0 SIM Mass Chromatogram for DINP
0.25 (0.5 g/mL, overlay at 7 replicates)
6.00 6.25 6.50 6.75 14.50 14.75 15.00 15.25 Top: Helium Carrier Gas (99.99%, with gas purification filter)
Chloroneb Endosulfate Bottom: Nitrogen Carrier Gas (99.99%, with gas purification filter)
Mass Chromatograms of Pesticides (5 ng/mL, SIM)
The retention indices are essentially unchanged even when the Equivalent chromatogram patterns and mass spectra were obtained even though the analysis conditions used with
conventionally used analysis conditions are converted for using helium as the carrier gas were converted for using nitrogen as the carrier gas. This can be applied for purposes of
hydrogen as the carrier gas. Mass spectral libraries containing qualitative analysis including the analysis of evolved gases from polymeric materials.
retention indices and databases provided by Shimadzu should be (×10,000,000)
3.0
used. TIC
EZGC Method Translator %
2.0 100 213
*1 EZGC is a trademark of Restek Corporation.
For details, refer to the Restek Corporation website.
http://www.restek.com/ezgc-mtfc 1.0 50
119 228
91
65 77 135 165
0
5.0 10.0 15.0 20.0 50 100 150 200 250
Hydrogen sensor (×10,000,000)
5.0 TIC
Hydrogen Sensor Assures Safety %
100 213
A hydrogen sensor (optional) can be installed inside the GC. By 2.5
discovering potential leaks in advance, accidents can be prevented. 50
Furthermore, the main unit is equipped with an automatic carrier 91 119 228
gas leak checking function, which strongly supports the use of 0.0 0 65 77 135 165
hydrogen as a carrier gas. 5.0 10.0 15.0 20.0 50 100 150 200 250
Sample Analysis of the Instantaneous Thermal Decomposition of an Electronic Board Utilizing Py-GC/MS
(mass spectrum for bisphenol A)
Hydrogen Sensor Monitors Inside of GC Oven Top: Helium Carrier Gas (99.99%, with gas purification filter)
Bottom: Nitrogen Carrier Gas (99.99%, with gas purification filter)

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