APPENDIX A: HOLDING-TIME STUDY RESULTS
Table A1. Comparison of results for direct analysis (Dir) with those using
salting-out (SOE), cartridge SPE (SPE-C) and membrane SPE (SPE-M) for
groundwater samples from NSWC.
Concentration (g/L)
Sample
Type
HMX
RDX
TNB
DNB DNA
TNT
24D
4A
2A
1
Dir
SOE
1.04
2.45
0.47
0.36
0.32
SPE-C
1.00
1.33
0.44
0.29
0.3
SPE-M
0.93
1.35
0.57
0.28
0.56
2
Dir
94
79
SOE
54.2
63.8
0.3
0.33
3.08
1.36
SPE-C
64.0
83.1
0.3
0.34
3.34
2.27
SPE-M
57.1
71.8
0.3
0.29
2.89
2.05
3
Dir
93
91
SOE
85.7
75.3
0.2
0.19
0.08
2.43
1.31
SPE-C
93.1
88.8
0.2
0.17
0.11
2.49
1.65
SPE-M
78.9
74.7
0.2
0.13
0.07
1.99
1.89
4
Dir
45
14
SOE
45.7
16.4
0.17
0.3
0.13
2.18
1.21
SPE-C
48.0
21.6
0.2
0.19
2.31
1.42
SPE-M
40.8
18.9
0.2
0.13
2.07
1.64
5
Dir
SOE
0.76
5.77
0.13
0.05
SPE-C
1.16
6.48
0.16
0.05
SPE-M
1.19
6.11
0.16
0.14
6
Dir
SOE
10.5
6.17
0.10
0.71
0.33
SPE-C
11.5
7.03
0.10
0.79
0.40
SPE-M
10.3
6.34
0.07
0.82
0.70
7
Dir
134
365
SOE
75.4
202
0.98
8.12
1.80
SPE-C
115
308
1.51
11.3
3.44
SPE-M
109
291
1.41
9.81
3.30
8
Dir
SOE
0.61
10.9
SPE-C
0.64
11.9
SPE-M
0.64
11.0
9
Dir
25
13
SOE
30.2
12.1
1.14
0.56
SPE-C
31.2
12.7
1.50
0.79
SPE-M
27.5
11.0
1.34
0.79
10
Dir
SOE
0.33
7.12
SPE-C
0.62
8.23
SPE-M
0.26
7.60
11
Dir
SOE
SPE-C
SPE-M
12
Dir
SOE
SPE-C
SPE-M
13
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