g soil subsamples and 50 mL of acetonitrile con-
separation described above. Example chromato-
taining 25-g/L 3,4-DNT as an internal standard.
grams of real soil extracts are shown in Figure 2.
If enough soil was available, MS/MSD were also
TNT was detected by GC in all 13 extracts rang-
ing from 1.3 to 273 g/kg (Table A2). For dupli-
prepared.
The GC analysis was conducted on an HP 6890
cates, the median relative percent difference
equipped with a -ECD. No dilutions were per-
(RPD%) was 11%. One sample (Camp Shelby)
formed for the GC analysis. For the HPLC analy-
showed very poor agreement between replicates.
sis, we used the Nova Pak C8 (Waters Millipore)
This sample had 2,4-DNT as the highest concen-
6,000
Eagle River Flats OB/OD Pad
5,000
4,000
3,000
2,000
1,000
0
0
5
10
15
Time (min)
a) GC-ECD analytical column (HP-5), Eagle River Flats.
6,000
Nebraska Ordnance Plant
5,000
4,000
3,000
2,000
1,000
0
0
5
10
15
Time (min)
b) GC-ECD analytical column (HP-5), Nebraska Ordnance Plant.
Figure 2. Chromatograms from field-contaminated soils (25 g extracted with 50 mL acetonitrile).
7
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