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Figure 2:
Detecting oxygenates in gasoline-water samples: 80ppb each analyte.
GC_EV00685
Rtx
®
-VMS, 30m, 0.25mm ID, 1.4µm (cat.# 19915)
Sample:
Calibration, internal standard, surrogate standardmixes (cat.# 30475B, 30465, 30006, 30240, 30074)
Purge and trap conditions
Trap:
#10 (Tenax
®
/silica gel/carbonmolecular sieve)
PurgeTime:
11min.
Purge FlowRate:
38mL/min.
Desorb FlowRate:
32mL/min.
DesorbTime:
1.0min.
BakeTime:
10min.
Sample Size:
10mL
WaterManagement:
110°C purge, 0°C desorb, 240°C bake
Split Ratio:
1:25
Temperatures:
Sample:
40°C
Trap:
20°C purge, 190°C desorb, 210°C bake
6-PortValve:
110°C
Transfer Line:
110°C
SpargeMount:
45°C
Desorb Preheat:
150°C
ValveManifold:
50°C
Other Conditions:
pre-purge, pre-heat, dry purgeOFF
Chromatography
Inj. temp.:
250°C
Carrier gas:
helium, constant flow
Flow rate:
1.3mL/min.
Dead time:
1.47min.@ 35°C
Oven temp.:
35°C (hold 7min.) to 90°C@ 4°C/min.(no hold) to 220°C@ 45°C/min. (hold 1min.).
Det.:
Agilent 5971AGC/MS
Transfer line temp.:
280°C
Scan range:
35-260 amu
Tune:
PFTBA/BFB
*carbon dioxide
1. dichlorodifluoromethane
2. chloromethane
3. vinyl chloride
4. bromomethane
5. chloroethane
6. trichlorofluoromethane
7. diethylether
8. 1,1-dichloroethene
9. carbon disulfide
10. Freon
®
113
11. iodomethane
12. allyl chloride
13. methylene chloride
14. acetone
15.
trans
-1,2-dichloroethene
16. methyl-d3-
tert
-butyl-ether
17. methyl acetate
18. methyl-
tert
-butyl-ether
19.
tert
-butyl alcohol
20. acetonitrile
21. diisopropyl ether
22. chloroprene
23. 1,1-dichloroethane
24. acrylonitrile
25. ethyl-
tert
-butyl ether
26.
cis
-1,2-dichloroethene
27. 2,2-dichloropropane
28. bromochloromethane
29. chloroform
30. carbon tetrachloride
31. tetrahydrofuran
32. methyl acrylate
33. 1,1,1-trichloroethane
34. dibromofluoromethane
35. 1,1-dichloropropene
36. 2-butanone
37. benzene
38. propionitrile
39. methacrylonitrile
40. 1,2-dichloroethane-d4
41. pentafluorobenzene
42.
tert
-amyl-methyl ether
43. 1,2-dichloroethane
44. isobutyl alcohol
45. trichloroethene
46. 1,4-difluorobenzene
47. dibromomethane
48. 1,2-dichloropropane
49. bromodichloromethane
50. methyl methacrylate
51.
cis
-1,3-dichloropropene
52. 2-chloroethyl vinyl ether
53. toluene-d8
54. toluene
55. 2-nitropropane
56. tetrachloroethene
57. 2-bromo-1-chloropropane
58. 4-methyl-2-pentanone
59.
trans
-1,3-dichloropropene
60. 1,1,2-trichloroethane
61. ethyl methacrylate
62. dibromochloromethane
63. 1,3-dichloropropane
64. 1,2-dibromoethane
65. 2-hexanone
66. chlorobenzene-d5
67. chlorobenzene
68. ethylbenzene
69. 1,1,1,2-tetrachloroethane
70.
m
-xylene
71.
p
-xylene
72.
o
-xylene
73. bromoform
74. stryrene
75. isopropylbenzene
76. 4-bromo-1-fluorobenzene (SS)
77. bromobenzene
78.
cis
-1,4-dichloro-2-butene
79. 1,4-dichlorobutane
80.
n
-propylbenzene
81. 1,1,2,2-tetrachloroethane
82. 2-chlorotoluene
83. 1,2,3-trichloropropane
84. 1,3,5-trimethylbenzene
85.
trans
-1,4-dichloro-2-butene
86. 4-chlorotoluene
87.
tert
-butylbenzene
88. pentachloroethane
89. 1,2,4-trimethylbenzene
90.
sec
-butylbenzene
91.
p
-isopropyltoluene
92. 1,3-dichlorobenzene
93. 1,4-dichlorobenzene-d4
94. 1,4-dichlorobenzene
95.
n
-butylbenzene
96. 1,2-dichlorobenzene
97. 1,2-dibromo-3-chloropropane
98. nitrobenzene
99. hexachlorobutadiene
100. 1,2,4-trichlorobenzene
101. naphthalene
102. 1,2,3-trichlorobenzene
Acknowledgment: purge& trap courtesy of O.I. Analytical.
GC_EV00686
Not detected: 2-chloroethanol
