Page 21 - Shimadzu Journal vol.4 Issue1

Natural Gas Analysis

uV(x100,000)

10.0 N 2
9.0 H 2 O 2
8.0
C 2H 6
7.0
C 2H 4
6.0 CO 2
5.0
4.0
CO
3.0 C 2H 2
H 2S
2.0
1.0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 min
Fig. 6 Chromatogram using the Ultrafast NGA system (Channel of BID)

uV(x100,000)
C6 CH4
+
7.0

6.0
C2H6

5.0

4.0
C3H8 i-C5H12
n-C4H10
3.0
i-C4H10
n-C5H12
2.0

1.0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 min
Fig. 7 Ultrafast NGA system Chromatogram (Channel of FID)

Table 4 Repeatability of peak areas of the Ultrafast NGA system (Channel of BID)
ID Compound Name 1 2 3 4 5 6 Mean Area RSD%
1 H 2 (16.02%) 1,221,080 1,217,638 1,220,585 1,221,434 1,219,877 1,221,352 1,220,328 0.12
2 O 2 (4.82%) 1,201,943 1,201,078 1,203,779 1,201,378 1,199,380 1,203,229 1,201,798 0.13
3 N 2 (9.98%) 1,514,715 1,511,981 1,517,955 1,514,142 1,514,211 1,518,090 1,515,182 0.16
4 CO (1.02%) 486,535 487,959 489,768 487,103 487,895 488,835 488,016 0.24
5 CO 2 (1.96%) 1,334,791 1,337,904 1,338,552 1,336,785 1,331,065 1,326,637 1,334,289 0.35
6 C 2H 4 (0.998%) 1,510,314 1,513,120 1,514,393 1,512,294 1,504,769 1,499,412 1,509,050 0.38
7 C 2H 6 (1.000%) 2,109,195 2,114,540 2,115,465 2,112,086 2,102,367 2,095,589 2,108,207 0.37
8 C 2H 2 (0.510%) 576,087 576,805 576,730 576,121 573,434 571,868 575,174 0.35
9 H 2S (0.525%) 512,847 508,727 510,989 511,634 508,666 511,887 510,792 0.34

A key aspect of this system is the use of one BID instead of two TCDs As Table 4 shows, the Ultrafast NGA system provides good
for detecting inorganic components. This stems from the ability of repeatability of peak areas with the BID channel. The Ultrafast NGA
the BID to provide high-sensitivity detection of all components. In system combines the best properties of high productivity and
addition, reducing the number of detectors simultaneously reduces reliability, allowing operators to optimize their workflow.
the number of columns required. In other words, the BID simplifies
analysis. In addition, because the BID is very sensitive and shows a 4. Conclusion
saturated response to highly-concentrated components, unlike TCD,
Shimadzu has offered various sorts of NGA systems for decades.
a small volume of sample loops (20 or 50 µL) is used in the stream,
Current systems, such as the Fast NGA system and Ultrafast NGA
and introduced samples are split at the front of columns. Finally, the
system, enable high productivity and reliability. These systems’
main component CH 4 is detected by another stream in an FID. In
features are based on innovative ideas, such as taking advantage of
parallel with CH 4 detection by FID, shortening the analysis time of the
capillary columns and adapting new detector technology. We will
BID stream resulted in an analysis time of less than 5 minutes.
continue to develop and refine systems to meet the demands of the
energy sector.

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