Gun Orientation
8
6
4
2
0
2
4
6
8m
58,400
57,700
89,400
96,800
77,000
1,030
0m
40,900
38,100
48,500
2
237,000
107,000
Figure 15. Concentrations of 2,4-DNT in sur-
face soil samples collected at the firing point
4
212,000
20,400
20,600
of 105-mm Howitzer #2.
6
8
16,000
52,700
101,000
10
12
14
35,300
2,450
6,080
Samples Collected
16
2,4-DNT (g/kg)
18
Gun #2
105-mm Howitzer
4,600
3,130
4,400
20
30,000
RTX-5
Sample #44
25,000
20,000
15,000
10,000
5,000
0
5
7
9
11
13
15
3
17
Time (min.)
Figure 16. GC-ECD chromatogram of a soil sample collected from a 105-
mm firing point at Fort Lewis.
center line. A chromatogram for the extract of one of
The distribution of 2,4-DNT in the soil in front of
the samples collected 20 m from the muzzle is typical
Howitzer #2 is shown in Figure 15. Concentrations of
of the low level of analytical interferences found for
2,4-DNT, the two amino transformation products of 2,4-
the set of samples from the firing point extracts (Fig.
DNT, 2,4,6-TNT, and the other isomers of DNT were
16). Even at this range, the mean concentration was
very similar to those found for samples collected in front
found to be 4,060 g/kg. Thus propellant residues are
of Howitzer #1. For Howitzer #2, samples were col-
spread over a relatively large surface area during firing
lected at distances as far as 20 m from the muzzle of
activity, but the amount of residue deposited from a
the gun, on the center line and 3 m to either side of the
19
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