Table 10. Retention times on analytical and confirmation columns.
Retention time (min)
HP-5*
RTX-225†
RTX-200**
RTX-200††
RTX-225†
1.5 m
1.0 m
1.5 m
1.5 m
0.1 m
Analyte
NB
1.16
1.07
2.69
o-NT
1.74
1.46
3.41
0.42
m-NT
2.13
1.87
4.04
0.52
p-NT
2.32
2.19
4.34
0.63
NG
4.14
5.17
7.75
1,4-DNB
4.87
6.6
9.79
7.78
3.99
1,3-DNB
5.10
6.92
10.52
8.16
4.29
2,6-DNT
5.27
6.53
9.94
7.83
3.96
1,2-DNB
5.33
7.84
11.49
8.71
5.19
3-Nitroaniline
5.48
8.32
7.68
5.70
2,5-DNT
5.69
7.04
8.43
4.45
2,4-Dinitrophenol
5.69
8.39
tri-Nitroso-RDX
5.73
2-Amino-6-NT
5.91
8.23
8.04
2,3-DNT
6.00
7.96
9.22
5.27
2,4-DNT
6.05
7.58
12.17
9.05
4.97
4-Amino-2-NT
6.17
8.51
8.2
5.94
3,5-DNT
6.28
7.84
9.46
5.19
3,4-DNT
6.68
9.00
14.39
10.25
6.33
2-Amino-4-NT
6.76
9.24
9.04
6.59
di-Nitroso-RDX
7.30
TNB
7.79
11.13
17.01
11.52
8.46
2,4,6-TNT
7.95
10.61
16.5
11.25
8.01
mono-Nitroso-RDX
8.45
PETN
8.85
7.23
13.00
2,4,5-TNT
8.86
12.53
9.43
2,3,4-TNT
9.12
12.93
9.55
RDX
9.55
15.06
20.84
13.38
12.08
3,4,5-TNT
9.69
13.87
10.49
2,4-Diamino-6-NT
9.77
13.78
12.2
TAX
10.11
4-Am-DNT
10.15
13.86
18.98
12.54
11.07
3,5-Dinitrophenol
10.18
11.73
3,5-DNA
10.24
14.63
19.87
13.00
11.69
2,6-Diamino-4-NT
10.48
14.65
12.97
2-Am-DNT
10.59
14.43
20.87
13.38
11.55
Tetryl
11.47
25.17
14.74
12.08
HMX
15.66
*HP-5 oven program 100C for 2 minutes, to 250C at 10/min and held 3 minutes; injector 250C; detector
280C.
†RTX-225 oven program: 100C for 2 minutes, to 220C at 10/min and held 6 minutes; injector 220C;
detector 220C.
**RTX-200 oven program: 100C for 1 minute, to 190C at 5C/min, to 200C at 1C/min, to 250C at 20C/
min.
††RTX-200 oven program 100C for 2 minutes, to 260C at 10/min and held 1 minute; injector 250C,
detector 280C.
Gas chromatography-electron capture
The vials were then removed from the bath and al-
(GC-ECD) determination
lowed to stand undisturbed for 30 minutes. A 2.5-mL
aliquot of each extract was removed using a glass sy-
All GC-ECD results were obtained on an HP6890
gas chromatograph equipped with a micro cell Ni63
ringe and filtered through a 25-mm Millex-FH (0.45-
ECD (300C). We used direct injection (250C) of
mm) disposable filter, with the first milliliter being dis-
1-L soil extracts in a packed port that was equipped
carded and the remainder being collected in a clean
autosampler vial.
with a deactivated Restek Uniliner. Primary analysis
10
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