4,000
3,000
2,000
1,000
0
4
5
6
7
8
9
10
11
12
13
Time (min)
a) HP-5 analytical column.
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
5
6
7
8
9
10
11
12
13
14
15
Time (min)
b) RTX-225 confirmation column.
Figure 6. GC-ECD chromatograms of soil extracts from a minefield sample.
observed; the correlation coefficient was greater
analytes, showing that accurate determinations are
than 0.99 and the slope slightly greater than 1.00.
more difficult to obtain than 2,4-DNT. Like the
Correlation coefficients were 0.951 and 0.956 for
nitramines, the amino-DNTs are susceptible to
2-Am-DNT and 4-Am-DNT, respectively. The
degradation as the GC injection port liner becomes
slopes of the least squares regression lines were
less and less inert with repeated injections of soil
not significantly different from 1.00 for either
extracts. On the HPLC separation, these analytes
analyte. The data are more scattered for these two
elute late where the peaks are quite broad.
26
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