seven discrete samples, which was 13,500 g/g
not significantly different at the 95% confidence
(Table 1b). Clearly, analysis of the composite pro-
level. This is true even with the good precision
vides a good estimate of the mean concentration
(RSDs of 4.1 and 10.1% for field and laboratory)
for the area sampled. For the laboratory analyses,
obtained for the analyses of these composite
the mean and standard deviation of the seven
samples. Thus, for this location, a good indication
composites was 14,100 1420 g/g, while the
of the degree of contamination could be obtained
mean of the results for the seven discrete samples
using a combination of composite sampling and
was 16,300 g/g. These results do not agree as
colorimetric on-site analysis.
well as those for the on-site analyses, but they
appear to be quite adequate when compared to
Sampling location 2
the wide range of concentrations found for the
Results for laboratory and on-site analyses of
discrete samples. ANOVA was conducted to com-
soils from sampling location 2 are presented in
pare the laboratory and on-site analysis results
Table 2a. Soil samples from location 2 had an
for the composite samples (Table 1b). The F ratio
aroma of shoe polish, pointing to the presence of
of 3.05 says that the results of the laboratory and
mononitrotoluenes, often present in conjunction
on-site analyses for this sampling location were
with high concentrations of DNT. Acetone ex-
Table 2. Results from sampling location 2, Monite site.
a. Analytical results.
DNT on-site
Laboratory analysis (g/g)
analysis
(g/g)
Sample
TNB
TNT
2,4-DNT
Total
Discrete samples
1a
31,700
--
2,370
113,000
115,000
1b
42,100
--
2,800
131,000
134,000
2a
8,290
--
1,900
5,820
7,720
2b
6,130
--
2,330
7,670
10,000
3a
29,300
--
5,260
47,000
52,300
3b
17,700
--
3,750
32,000
35,800
4a
24,400
--
4,700
29,500
34,200
4b
16,500
--
5,000
31,100
36,100
5a
9,610
--
334
10,600
10,900
5b
6,640
--
386
10,500
10,900
6a
14,500
--
383
16,700
17,100
6b
11,800
--
421
15,900
16,300
7a
3,070
--
481
3,450
3,930
7b
3,910
--
432
3,120
3,550
mean
16,100
34,900
Composites
C1
27,100
--
1,840
28,900
30,700
C2
23,500
--
2,060
31,600
33,700
C3
28,500
--
2,210
35,100
37,300
C4
23,400
--
2,020
31,300
33,300
C5
19,300
--
2,140
32,000
34,100
C6
23,200
--
2,120
33,200
35,300
C7
21,500
--
1,650
28,900
30,600
mean
23,800
33,600
std. dev.
3,140
2,390
12
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