Figure 40A.
AnRtx
®
-VGC / Rtx
®
-502.2 column pair and a 50°C initial temperature reduce
total cycle time to less than 30minutes for EPAMethod 8021A/502.2.
40
min. 5
10
15
20
25
PID
ELCD
PID
ELCD
3
7
10
11
13
19
20
22
23
28
29
30
31
62
63
64
65
66
1
2
3
5 6
4
7
8
9
10
12
13
14
15
16
17
18
19
21
23
22
24
25 26
27
28
30
31
32
33
34
35
36
38
41
44
58
60
61
62
63
64
66
57
min.17.5
20.0
19.9 20.0 20.1 20.2 20.3 20.4 20.5
36
37
39,40
41
42
43
45
46
47
49
51
52
53
54
55
56
57
58
59 60
46
48
49
50
52
Innovations atWork
Fastest cycle time for 8021/502.2!
50°C starting temperature brings
total cycle time to less than 30min.
GC_EV00418
min. 5
10
15
20
25
1. dichlorodifluoromethane
2. chloromethane
3. vinyl chloride
4. bromomethane
5. chloroethane
6. trichlorofluoromethane
7. 1,1-dichloroethene
8. allyl chloride
9. methylene chloride
10.
trans
-1,2-dichloroethene
11. methyl
tert
-butyl ether
12. 1,1-dichloroethane
13.
cis
-1,2-dichloroethene
14. 2,2-dichloropropane
15. bromochloromethane
16. chloroform
17. carbon tetrachloride
18. 1,1,1-trichloroethane
19. 1,1-dichloropropene
20. benzene
21. 1,2-dichloroethane
22. fluorobenzene (SS)
23. trichloroethene
24. dibromomethane
25. 1,2-dichloropropane
26. bromodichloromethane
27. 1-bromo-2-chloroethane (SS)
28.
cis
-1,3-dichloropropene
29. toluene
30. tetrachloroethene
31.
trans
-1,3-dichloropropene
32. 1,1,2-trichloroethane
33. dibromochloromethane
34. 1,3-dichloropropane
35. 1,2-dibromoethane
36. chlorobenzene
37. ethylbenzene
38. 1,1,1,2-tetrachloroethane
39.
m
-xylene
40.
p
-xylene
41. 1-chloro-2-fluorobenzene (SS)
42.
o
-xylene
43. styrene
44. bromoform
45. isopropylbenzene
46. bromobenzene
47.
n
-propylbenzene
48. 1,1,2,2-tetrachloroethane
49. 2-chlorotoluene
50. 1,2,3-trichloropropane
51. 1,3,5-trimethylbenzene
52. 4-chlorotoluene
53.
tert
-butylbenzene
54. 1,2,4-trimethylbenzene
55.
sec
-butylbenzene
56.
p
-isopropyltoluene
57. 1,3-dichlorobenzene
58. 1,4-dichlorobenzene
59.
n
-butylbenzene
60. 1,2-dichlorobenzene
61. 1,2-dibromo-3-chloropropane
62. 2-bromo-1-chlorobenzene (SS)
63. hexachlorobutadiene
64. 1,2,4-trichlorobenzene
65. naphthalene
66. 1,2,3-trichlorobenzene
Acknowledgement: Finnigan 9001GC, µGoldTandemPhotoionization/HALL
®
2000ElectrolyticConductivityDetector provided courtesy of ThermoFinniganGC&GC/MS
Division, 2215GrandAvenue Pkwy, Austin, Texas 78728
Rtx
®
-VGC
75m, 0.45mm ID, 2.55µm (cat.# 19409)
Primary column:
75m, 0.45mm ID, 2.55 mRtx
fi
-VGC (cat.# 19409)
Confirmation column:
75m, 0.45mm ID, 2.55 mRtx
fi
-502.2 (cat.# 10986)
Conc.:
10ppb in 5mLof ROwater
Concentrator:
Tekmar LSC3100 Purge andTrap
Trap:
Vocarb 3000
Purge:
11min.@40mL/min.
Dry purge:
1min.@40mL/min.
Desorb preheat:
245 C
Desorb:
250 C for 2min.
Bake:
260 C for 8min.
Interface:
direct connection from concentrator to column
Transfer line:
Siltek 0.32mm fused silica transfer line direct to
columnsw/ Press-Tight Y connector (cat. # 20403)
Gas chromatograph:
Finnigan 9001
Carrier gas:
helium@~10mL/min. constant pressure
Adjust dichlorodifluoromethane to a retention time
of 2.28min.@50 C on theRtx
fi
-VGC column.
Oven temp.:
50 C (hold 2min.) to 70 C@2 C/min. to 130 C@
9 C/min.
to 200 C@40 C/min. (final hold 5min.)
Detectors:
GoldTandemPID/Hall 2000ELCD
PID: makeup 7mL/min., purge 7mL/min.,
set@0.35mVbase temp 200 C.
Hall 2000ELCD: RxnGas 25mL/min., Temp.940 C,
propanol flow 470 L/min.
