38
Figure 39A.
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.
1. dichlorodifluoromethane
2. chloromethane
3. vinyl chloride
4. bromomethane
5. chloroethane
6. trichlorofluoromethane
7. 1,1-dichloroethene
8. Freon
fi
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 5mLof ROwater.
Primary column:
75m, 0.45mm ID, 2.55 mRtx
fi
-VGC (cat.# 19409)
Confirmation column:
75m, 0.45mm ID, 2.55 mRtx
fi
-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
fi
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 gas:
helium 11mL/min., constant pressure
Adjust dichlorodifluoromethane to a retention time of 2.28min.
@35 C on theRtx
fi
-VGC column.
Detectors:
GoldTandemPID/HALL2000ELCD
PID: makeup 7mL/min., purge 7mL/min., set@0.35mV,
base temp 200 C.
Hall 2000ELCD: RxnGas 25mL/min., RxnTemp. 940 C,
propanol flow 470 L/min.
Rtx
®
-VGC
75m, 0.45mm ID, 2.55µm (cat.# 19409)
PID
min. 5
10
15
20
25
3
7
11
12
14
20
21
23 24
29
30
3132
37
63
64
65
66
37
38
39
41,42
43
44
46
47
48
50
52
53
54
55
56
57
59 58
60
61
22
23
24
25
26
Innovations atWork
Rtx
®
-VGC polymer specially
designed for volatiles analysis by
PID/ELCD. Freon
®
113 added.
ELCD
47
49
50
51
53
24
24.5
25
7
8
9
10
11
13
4
5
6
1 2
3
20
22
23
24
25
26
27
28
29
3132
33
14
15
16
17
18
19
34
35
36
37
38
40
45
58
59
62
61
63
64
66
Acknowledgement: Finnigan 9001GC, µGoldTandemPhotoionization/HALL
®
2000ElectrolyticConductivityDetector provided courtesy of ThermoFinniganGC
&GC/MSDivision, 2215GrandAvenue Pkwy, Austin, Texas 78728
GC_EV00416
min. 5
10
15
20
25
