Page 6 - Shimadzu GC-2010 Pro

Constant linear velocity mode quickly determines separation conditions

The constant linear velocity mode related to the separation performance is recommended for the carrier gas control and
can obtain the optimum separation conditions in the shortest time compared with the previous control method by setting
the column inlet pressure and flow.
Constant column inlet pressure
[Conditions of Analysis]
Rapid oven heating / cooling 1.Pencycuron Column: SH-Rtx column 30m X 0.32mm i.d.df=0.25 m
2.Benfluralin
Column temperature: 60℃(1 min)-7℃/min-230℃
3.Propyzamide Injection port temperature: 240℃
4.Diazinon Detector temperature: 270℃ (FID)
5.Fenitrothion（MEP） Carrier gas: He
Carrier gas linear velocity: 40cm/sec, column inlet pressure 44.0kPa
GC-2010 Pro incorporates a double-jet cooling system, which enables the reduction of cooling time from 450℃ to 50℃ 6.Chlorpyrifos Injection volume: 1 L (splitless analysis)
in 3.4min, realizing more efficient and rapid cooling. In addition, with the ability of rapid heating, GC-2010 Pro can
significantly reduce the analysis time.
Column oven temperature (℃) Constant linear velocity
450
Large fan rapidly 1.Pencycuron
discharges hot air 400 2.Benfluralin
350 GC-2010 3.Propyzamide
GC-2010 Pro
Pro
300 4.Diazinon
5.Fenitrothion（MEP）
250
Small fan added to Significant reduction 6.Chlorpyrifos
enhance efficiency of 200 of cooling time
cooling air intake 150
100
3.4 min
50
Comparison of chromatograms with constant linear velocity and constant column inlet pressure
0
0 1 2 3 4 5 6 (Pesticides analysis)
Time (minutes)
Double-jet cooling system
Gas saver function reduces helium consumption
Reducing running cost by gas saving is an important issue in GC operation. GC-2010 Pro reduces gas consumption by
decreasing of split ratio after injection as well as automatic shutdown functions after finishing all analysis.
24 min Approx. 4.7 min 3 min

Cooling Equilibrium To next analysis Split flow (mL/min) 2500
time 200 2000

Analysis case: organic compound analysis with GC-2010 Carrier gas Carrier gas 1500 Reduced by about
savings Carrier gas savings savings Carrier gas savings
Total analysis time: 31.7min Helium consumption [mL] 1000 83%
20
0 Analysis Analysis Analysis Analysis Time 500
Start Finish Start Maintain the carrier gas saving mode 0
Approx. after analysis and during stand-by Unused Use the carrier gas
saver function
12.5 min 2.7min 3 min
Carrier gas saver function example Analysis time: 30min split ratio: 100
Cooling Equilibrium To next analysis Carrier gas saver function: split ratio 10 one minute later
time time Column temperature: 170℃
In this example, the split flow is set to 200mL/min only upon injection and in the remaining time, Chromatographic column: inner diameter 0.25mm
length 30m film thickness 0.25 m
the split ratio is reduced to 20mL/min to save carrier gas consumption. The carrier gas saving
Analysis case: organic compound analysis with GC-2010 Pro
Analysis cycle time reduced by about 13.5 min mode is maintained after the end of batch processing analysis until the beginning of the next Comparison of helium consumption for one analysis
Total analysis time: 18.2min batch processing analysis. using and not using carrier gas saver function

GC-2010 Pro
6 Capillary Gas Chromatograph 7