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GC COLUMNS | GENERAL-PURPOSE COLUMNS
Rtx®-624
Rtx®-624 Structure
x y
Si O
(CH2)3
CH 3
Si O
CH3
z
CH3
CH3
Si O
C N
Similar to: (6%-cyanopropylphenyl)-methylpolysiloxane
also
available
Metal MXT® Columns
Rugged, flexible, Siltek®-treated stainless
steel tubing; inertness comparable to
fused silica tubing.
MXT®-624 columns..............
1 2 3 4
5
6 7
8
9 10
11
1213
14
15
16
17 18
19
20
21
22
23
24
25
26
27
28
29
30
31
32,33
34
35 36
37
2 3 4 5 6 7 8 9 10 11 12 13 14 15
Time (min)
Volatiles US EPA Method 624 on Rtx®-624
GC_EV00701
Column Rtx®-624, 40 m, 0.18 mm ID, 1.00 µm (cat.# 40925)
Sample 624 Internal Standard Mix (cat.# 30023)
624 Surrogate Standard Mix (cat.# 30243)
Volatiles MegaMix™, EPA Method 624 (cat.# 30497)
Conc.: compounds at 50 ppb (IS @ 40ppb) in 5mL of RO water
Injection purge and trap split (split ratio 40:1)
Inj. Temp.: 250 °C
Purge and Trap
Instrument: Tekmar LSC-3100 Purge and Trap
Trap Type: Vocarb 3000 (type K)
Purge: 11 min @ ambient, flow 40 mL/min
Dry Purge: 1 min, flow 40 mL/min
Desorb Preheat
Temp.: 245 °C
Desorb: 2 min @ 250 °C, flow 10 mL/min
Bake: 8 min @ 260 °C
Interface Connection: injection port
Transfer Line Tubing: Silcosteel® transfer line, 1mm ID sleeve
Oven
Oven Temp.: 50 °C (hold 4 min) to 100 °C at 12 °C/min to 230 °C
at 27 °C/min (hold 2 min)
Carrier Gas He, constant flow
Flow Rate: 1.1 mL/min
Dead Time: 2.06 min @ 50 °C
Detector Agilent 5971A GC/MS
Transfer Line Temp.: 280 °C
Analyzer Type: Quadrupole
Tune Type: PFTBA/BFB
Ionization Mode: EI
Scan Range: 35-260 amu
Notes (MCS bypassed using Silcosteel® tubing)
Peaks
1. Chloromethane
2. Vinyl chloride
3. Bromomethane
4. Chloroethane
5. Trichlorofluoromethane
6. 1,1-Dichloroethene
7. Methylene Chloride
8. trans -1,2-Dichloroethene
9. 1,1-Dichloroethane
10. Bromochloromethane
11. Chloroform
12. 1,1,1-Trichloroethane
13. Pentafluorobenzene
14. Carbon Tetrachloride
15. Benzene
16. 1,2-Dichloroethane
17. Fluorobenzene
18. Trichloroethene
19. 1,2-Dichloropropane
20. Bromodichloromethane
21. 2-Chloroethyl vinyl ether
22. cis-1,3-Dichloropropene
23. Toluene
24. 2-Bromo-1-chloropropane
25. 1,1,2-Trichloroethane
26. Tetrachloroethene
27. Dibromochloromethane
28. trans-1,3-Dichloropropene
29. Chlorobenzene
30. Ethylbenzene
31. Bromoform
32. 1,4-Dichlorobutane
33. 4-Bromofluorobenzene
34. 1,1,2,2-Tetrachloroethane
35. 1,3-Dichlorobenzene
36. 1,4-Dichlorobenzene
37. 1,2-Dichlorobenzene
Rtx®-624 Columns (fused silica)
(low- to midpolarity phase)
• Application-specific columns for volatile organic pollutants. Recommended
in U.S. EPA methods for volatile organic pollutants.
• Temperature range: -20 °C to 240 °C.
• Equivalent to USP G43 phase.
The unique polarity of the Rtx®-624 column makes it ideal for analyzing volatile or-
ganic pollutants. Although the Rtx®-502.2 column is recommended in many methods,
the Rtx®-624 column offers better resolution of early eluting compounds. The Rtx®-624
phase produces greater than 90% resolution of the first six gases in EPA Methods 8260
and 524.2. This stationary phase is especially well-suited for EPA Method 524.2 since it
resolves 2-nitropropane from 1,1-dichloropropanone, which share quantification ion
m/z 43 and must be separated chromatographically.
similar phases
DB-1301, DB-624, DB-624UI, VF-1301ms,
VF-624ms, CP-1301, ZB-624
*Maximum temperatures listed are for shorter length columns. Longer columns may have a different maximum temperature.
30-Meter 60-Meter 75-Meter 105-Meter
ID df temp. limits* cat.# price cat.# price cat.# price cat.# price
0.25 mm 1.40 µm -20 to 240 °C 10968 10969
0.32 mm 1.80 µm -20 to 240 °C 10970 10972
0.53 mm 3.00 µm -20 to 240 °C 10971 10973 10974 10975
20-Meter 40-Meter
ID df temp. limits cat.# price cat.# price
0.18 mm 1.00 µm -20 to 240 °C 40924 40925