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5
Micro GC Channels
Molsieve 5Å columns
Molsieve 5Å columns
The Molsieve 5Å column is designed to separate: hydrogen, carbon monoxide, methane, nitrogen,
oxygen, and some noble gases. Higher molecular weight components have much higher retention
times on this column.
Table 15 Molsieve 5Å instrument parameters
Parameter
Column temperature
Injector temperature
Column pressure
Sample time
Injection time
Run time
Detector sensitivity
Peak 1
Peak 2
Peak 3
Peak 4
Peak 5
Molsieve 5Å 4 m heated
mV
2
14
12
10
8
3
6
4
2
1
0
0
5
10
15
20
Agilent 990 Micro GC User Manual
4 m Heated
110 °C
110 °C
100 kPa (15 psi)
30 s
40 ms
25 s
Auto
Hydrogen 1.0 %
Argon/Oxygen 0.4 %
Nitrogen 0.2 %
_________
_________
Molsieve 5Å 10 m heated
mV
4.5
3
4
4
3.5
3
2.5
2
1.5
1
2
1
0.5
0
25
0
20
40
60
Seconds
10 m Heated
40 °C
50 °C
150 kPa (21 psi)
30 s
40 ms
140 s
Auto
Neon 18 ppm
Hydrogen 1.0 %
Argon 0.2 %
Oxygen 0.2 %
Nitrogen 0.2 %
mV
450
400
350
300
250
5
200
150
100
50
0
80
100
120
140
160
0
Seconds
20 m Heated
40 °C
50 °C
200 kPa (28 psi)
30 s
40 ms
210 s
Auto
Neon 18 ppm
Hydrogen 1.0 %
Argon 0.2 %
Oxygen 0.2 %
Nitrogen 0.2 %
Molsieve 5Å 20 m heated
3
4
5
2
1
50
100
150
200
250
Seconds
65
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