39
Figure 39B.
AnRtx
®
-VGC primary column and anRtx
®
-VRX confirmation column separate volatile organic gases from the trihalomethanes –
there are no coelutions on the primary column using the PID/ELCD detectors in tandem.
min. 5
10
15
20
25
30
min. 5
10
15
20
25
PID
PID
ELCD
Rtx
®
-VRX
75m, 0.45mm ID, 2.55µm (cat.# 19309)
3
7
9
11
12 14
20
21
23 24
29
32
30
31
37
38
39
41 42
44
43
64
65
66
63
1
2
3
4
5
6
7
10
8,9
11
13
14
16
17
15
22
19
20
18
25
26
24,27
28
29
32
33
35
34
36
31
37
40
38
45
49
51
47
50
53
58
59
61
62
64
63
66
31
37
38
39
41 42
44
43
46
47
48
50
53
52
54
55
56,58
59
57
61
60
20.0
22.5
25.0
Acknowledgement: Finnigan 9001GC, µGoldTandemPhotoionization/HALL
®
2000ElectrolyticConductivityDetector provided courtesy of ThermoFinniganGC
&GC/MSDivision, 2215GrandAvenue Pkwy, Austin, Texas 78728
Innovations atWork
Rtx
®
-VRX column is an excellent confirmation
column to theRtx
®
-VGCcolumn.
23
GC_EV00417
1. dichlorodifluoromethane
2. chloromethane
3. vinyl chloride
4. bromomethane
5. chloroethane
6. trichlorofluoromethane
7. 1,1-dichloroethene
8. Freon
®
113
9. allyl chloride
10. methylene chloride
11.
trans
-1,2-dichloroethene
12. methyl
tert
-butyl ether
13. 1,1-dichloroethane
14.
cis
-1,2-dichloroethene
15. 2,2-dichloropropane
16. bromochloromethane
17. chloroform
18. carbon tetrachloride
19. 1,1,1-trichloroethane
20. 1,1-dichloropropene
21. benzene
22. 1,2-dichloroethane
23. fluorobenzene (SS)
24. trichloroethene
25. dibromomethane
26. 1,2-dichloropropane
27. bromodichloromethane
28. 1-bromo-2-chloroethane (SS)
29.
cis
-1,3-dichloropropene
30. toluene
31. tetrachloroethene
32.
trans
-1,3-dichloropropene
33. 1,1,2-trichloroethane
34. dibromochloromethane
35. 1,3-dichloropropane
36. 1,2-dibromoethane
37. 1-chloro-3-fluorobenzene (SS)
38. chlorobenzene
39. ethylbenzene
40. 1,1,1,2-tetrachloroethane
41.
m
-xylene
42.
p
-xylene
43.
o
-xylene
44. styrene
45. bromoform
46. isopropylbenzene
47. bromobenzene
48.
n
-propylbenzene
49. 1,1,2,2-tetrachloroethane
50. 2-chlorotoluene
51. 1,2,3-trichloropropane
52. 1,3,5-trimethylbenzene
53. 4-chlorotoluene
54.
tert
-butylbenzene
55. 1,2,4-trimethylbenzene
56.
sec
-butylbenzene
57.
p
-isopropyltoluene
58. 1,3-dichlorobenzene
59. 1,4-dichlorobenzene
60.
n
-butylbenzene
61. 1,2-dichlorobenzene
62. 1,2-dibromo-3-chloropropane
63. hexachlorobutadiene
64. 1,2,4-trichlorobenzene
65. naphthalene
66. 1,2,3-trichlorobenzene
20ppb in 5mL of ROwater.
Primary column:
75m, 0.45mm ID, 2.55µmRtx
®
-VGC (cat.# 19409)
Confirmation column:
75m, 0.45mm ID, 2.55µmRtx
®
-VRX (cat.# 19309)
Concentrator:
Tekmar LSC-3000 Purge andTrap
Trap:
Vocarb
™
3000
Purge:
11min.@40mL/min.
Dry purge:
1min.@40mL/min. (MCS by-passedwith
Silcosteel
®
tubing [cat.# 21035])
Desorb preheat: 245°C
Desorb:
250°C for 2min.
Bake:
260°C for 8min.
Interface:
direct
Transfer line:
0.32mm IDSiltek
™
tubing (Cat. #10027)
GC:
Finnigan 9001
Oven temp.:
35°C (hold 4min.) to 75°C@3°C/min. (hold 2min.)
to 175°C@21°C/min. to 205°C@35°C/min. (hold 5min.)
Carrier:
helium 11mL/min., constant pressure
Adjust dichlorodifluoromethane to a retention time of 2.28min.
@35°C on theRtx
®
-VGC column.
Detectors:
µGoldTandemPID/HALL 2000ELCD
PID: makeup 7mL/min., purge 7mL/min., set@0.35mV,
base temp 200°C.
Hall 2000ELCD: RxnGas 25mL/min., RxnTemp. 940°C,
propanol flow 470µL/min.
