These locations were subsequently labeled grids
could be exploited to estimate the concentration
D2 and D5. Cores were divided into two depth
of HMX when present at high concentration in
intervals (0 to 7.5 cm and 7.5 to 15 cm). The two
soil samples. Results of the respective concentra-
core segments were each analyzed in duplicate,
tions of RDX determined by both EIA and HPLC
while only a single analysis was conducted for
for the acetone extracts are reported in Table 1.
the surface samples.
RDX was detected in only seven samples out of
The EIA RDX test was run on this first set of
30 samples analyzed by HPLC. However, a posi-
samples to evaluate if it could be used to assess
tive response was obtained for two-thirds of the
HMX contamination. There is a cross-reactivity
samples with the EIA D TECH test. This confirms
response for HMX in the RDX explosive test kit,
the low cross-reactivity toward HMX for the RDX
as described by the D TECH documentation. It
EIA test, leading to a high rate of false positives
for RDX determination in the presence of high
was our goal to examine if this cross-reactivity
Table 1. Analytical results from initial samples used to assess depth of contamination.
Depth
HMX (mg/kg)
TNT (mg/kg)
RDX (mg/kg)
Grid location
(cm)
Color. on-site
HPLC-acetone
Color. on-site
HPLC-acetone
EIA on-site
HPLC-acetone
D2 Location 1
Surface
593
524
<1
<1
4.05.0
1.56
D2 Location 1
07.5
341
424
2.9
1.5
0.51.5
0.24
480
344
1.6
1.2
4.560
3.27
D2 Location 1
7.515
84
78
<1
<1
0.51.5
<d
9.4
8.5
<1
<1
<0.5
<d
D2 Location 2
Surface
452
408
<1
<1
4.05.0
<d
D2 Location 2
07.5
322
284
<1
<1
3.04.5
4.00
503
411
24
24
4.56.0
0.66
D2 Location 2
7.515
72
59
<1
<1
3.04.5
<d
48
40
<1
<1
0.51.5
<d
D2 Location 3
Surface
599
636
<1
<1
>5.0
<d
D2 Location 3
07.5
410
400
4.8
4.6
1.53.0
<d
561
450
12
11
1.53.0
<d
D2 Location 3
7.515
12
11
<1
<1
1.53.0
<d
125
111
1.9
1.6
0.51.5
0.35
D5 Location 1
Surface
55
70
<1
<1
0.51.5
0.27
D5 Location 1
07.5
41
36
<1
<1
0.51.5
<d
36
36
<1
<1
0.51.5
<d
D5 Location 1
7.515
7.7
2.1
<1
<1
<0.5
<d
11
4.0
<1
<1
<0.5
<d
D5 Location 2
Surface
142
141
<1
<1
0.51.5
<d
D5 Location 2
07.5
57
50
<1
<1
0.51.5
<d
48
35
<1
<1
<0.5
<d
D5 Location 2
7.515
2.3
2.3
<1
<1
<0.5
<d
7.0
5.9
<1
<1
<0.5
<d
D5 Location 3
Surface
66
88
<1
<1
0.51.5
<d
D5 Location 3
07.5
17
21
<1
<1
0.51.5
<d
10
15
<1
<1
<0.5
<d
D5 Location 3
7.515
1.9
1.8
<1
<1
<0.5
<d
1.9
1.8
<1
<1
<0.5
<d
10
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