Table A7. Method detection limits from 25 g Ottawa sand aged 1 hr after spiking and then
extracted with 50 mL acetontrile (3,4-DNT internal standard).
Concentration (g/kg)
Replicate
1,4-DNB
1,3-DNB
1,2-DNB
2,4-DNT
4-Am-DNT
2-Am-DNT
TNT*
RDX
1
2.2
2.3
2.1
2.7
2.2
2.7
4.4
7.8
2
1.8
1.6
1.8
2.4
2.0
2.0
5.1
7.2
3
1.5
1.4
1.5
1.7
1.5
1.7
5.4
5.3
4
1.4
1.3
1.5
1.8
1.5
1.7
2.8
5.8
5
1.9
1.8
1.9
2.0
2.0
2.1
10.3
7.1
6
2.4
2.5
2.2
2.4
2.3
2.3
4.3
6.6
7
2.2
2.4
2.1
2.5
2.1
2.2
4.5
7.4
8
2.0
1.7
1.9
2.2
2.0
2.2
12.3
7.5
9
2.0
2.0
1.9
2.2
2.0
1.9
8.6
7.7
10
1.9
2.1
2.0
2.2
2.0
2.0
14.2
8.2
Mean
1.9
1.9
1.9
2.2
2.0
2.1
7.2
7.0
Std. dev.
0.30
0.41
0.23
0.30
0.25
0.30
3.89
0.91
MDL
0.86
1.16
0.64
0.86
0.70
0.84
10.97
2.57
Target conc.
2.00
2.02
2.06
2.05
2.02
2.01
2.00
8.00
(g/kg)
*Ottawa sand extracts contained an interference that co-eluted with TNT.
Table A8. Spike recovery from 25 g Ottawa sand aged 24 hr after spiking and extracted with 50
mL acetontrile (3,4-DNT internal standard).
Concentration (g/kg)
Replicate
1,4-DNB
1,3-DNB
1,2-DNB
2,4-DNT
4-Am-DNT
2-Am-DNT
TNT
RDX
1
7.6
8.0
8.0
8.7
7.7
8.6
12.7
34.4
2
7.1
7.4
7.4
8.0
6.9
7.7
9.7
30.0
3
8.2
8.5
8.5
9.0
7.7
9.3
13.6
36.6
4
8.2
8.5
8.5
9.2
8.1
9.5
13.2
38.0
5
8.2
8.7
8.7
9.3
7.6
9.6
13.7
42.7
Mean
7.8
8.2
8.2
8.8
7.6
8.9
12.6
36.3
Std. dev.
0.5
0.5
0.5
0.5
0.4
0.8
1.7
4.7
RSD (%)
6.1%
6.4%
6.4%
5.9%
5.7%
9.2%
13%
13%
Target conc.
10.0
10.1
10.3
10.2
10.1
10.0
10.0
40.0
(g/kg)
Recovery
78%
81%
80%
86%
75%
89%
126%
91%
39
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