551
GC CHROMATOGRAMS |
ENVIRONMENTAL
Volat i les
Volatile Organics
US EPA Method 524.2 Revision IV
Rtx®-VMS
Purge and Trap Conditions:
Concentrator:
Tekmar LSC-3100 purge and trap
Trap:
Vocarb 3000 (type K)
Purge:
11 min. @ 40mL/min. @ ambient temperature.
Dry purge:
1 min. @ 40mL/min. (MCS bypassed using Silcosteel
®
tubing)
Desorb preheat:
245°C
Desorb:
250°C for 2 min., flow 33mL/min.
Bake:
260°C for 8 min.
Interface:
Silcosteel
®
transfer line
1:30 split at injection port. 1mm ID split inlet liner
(cat.# 20972)
Column:
Rtx
®
-VMS, 30m, 0.25mm ID, 1.4µm (cat.# 19915)
Sample:
502.2 Calibration Mix #1 (cat.# 30042)
Drinking Water VOA MegaMix
®
, 524.2 Rev 4 (cat.# 30601)
524 Internal Standard/Surrogate Mix (cat.# 30201)
Ketone Mix, EPA Method 524.2 Rev 4.1 (cat.# 30602)
Compounds at 20 ppb each in 5mL RO water
(ketones at 50ppb; internal standards at 40ppb)
Inj. temp.:
250°C
Carrier gas:
helium, constant flow
Flow rate:
1.1mL/min.
Dead time:
1.48 min. @ 40°C
Oven temp.:
40°C (hold 2 min.) to 85°C @ 14°C/min. (hold 2 min.) to
220°C @ 30°C/min. (hold 4 min.).
Det:
Agilent 5971A GC/MS
Transfer line temp.:
280°C
Scan range:
35-300amu
Tune
PFTBA/BFB
Ionization:
EI
1. dichlorodifluoromethane
2. chloromethane
3. vinyl chloride
4. bromomethane
5. chloroethane
6. trichlorofluoromethane
7. diethyl ether
8. 1,1-dichloroethene
9. carbon disulfide
10. iodomethane
11. allyl chloride
12. methylene chloride
13. acetone
14.
trans
-1,2-dichloroethene
15. methyl
tert
-butyl ether
16. 1,1-dichloroethane
17. acrylonitrile
18.
cis
-1,2-dichloroethene
19. 2,2-dichloropropane
20. bromochloromethane
21. chloroform
22. methyl acrylate
23. carbon tetrachloride
24. tetrahydrofuran
25. 1,1,1-trichloroethane
26. 2-butanone
27. 1,1-dichloropropene
28. 1-chlorobutane
29. propionitrile
30. methacrylonitrile
31. benzene
32. 1,2-dichloroethane
33. fluorobenzene
34. trichloroethene
35. dibromomethane
36. 1,2-dichloropropane
37. bromodichloromethane
38. methyl methacrylate
39.
cis
-1,3-dichloropropene
40. toluene
41. chloroacetonitrile
42. 2-nitropropane
43. 1,1-dichloropropanone
44. 4-methyl-2-pentanone
45. tetrachloroethene
46.
trans
-1,3-dichloropropene
47. 1,1,2-trichloroethane
48. ethyl methacrylate
49. dibromochloromethane
50. 1,3-dichloropropane
51. 1,2-dibromoethane
52. 2-hexanone
53. chlorobenzene
54. ethylbenzene
55. 1,1,1,2-tetrachloroethane
56.
m
-xylene
57.
p
-xylene
58.
o
-xylene
59. styrrene
60. bromoform
61. isopropylbenzene
62. 4-bromofluorobenzene
63. bromobenzene
64.
n
-propylbenzene
65. 1,1,2,2-tetrachloroethane
66. 2-chlorotoluene
67. 1,2,3-trichloropropane
68. 1,3,5-trimethylbenzene
69.
trans
-1,4-dichloro-2-butene
70. 4-chlorotoluene
71.
tert
-butylbenzene
72. pentachloroethane
73. 1,2,4-trimethylbenzene
74.
sec
-butylbenzene
75.
p
-isopropyltoluene
76. 1,3-dichlorobenzene
77. 1,4-dichlorobenzene
78.
n
-butylbenzene
79. hexachloroethane
80. 1,2-dichlorobenzene-d4
81. 1,2-dichlorobenzene
82. 1,2-dibromo-3-chloropropane
83. nitrobenzene
84. hexachlorobutadiene
85. 1,2,4-trichlorobenzene
86. naphthalene
87. 1,2,3-trichlorobenzene
GC_EV00718
*Peaks 42 & 43 share an ion (43).
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Mar 2011
