Table 3. Average and standard deviations (n = 2) of analyte concentrations (mg/kg) in cov-
ered brass core barrel liners stored for two and six days at 42C.
Analyte concentrations (mg/kg)
2 days
6 days
Compound
D0
W-T*
A-F†
T-T**
T-ST††
W-T
A-F
T-T
T-ST
TDCE
23
3.8
4.8
11
6.8
1.7
1.0
2.0
1.1
0
0.1
3
2
1
0.3
0.1
0.3
0.1
17%***
21%
48%
30%
7.4%
4.3%
8.7%
4.7%
CDCE
35
12
13
26
20
4.4
3.2
6.7
4.1
1
1
6
3
2
1
0.8
3
0.3
34%
37%
76%
57%
13%
9.1%
19%
12%
Ben
24
6.3
8.1
16
12
2.9
8.4
3.4
2.1
1
1
4
1
1
1
0.7
1
0.2
26%
34%
67%
50%
12%
35%
14%
8.8%
TCE
35
12
14
24
20
8.4
6.8
10
7.9
6
1
6
2
1
2
0.5
1
0.4
34%
40%
68%
59%
24%
19%
29%
23%
Tol
32
13
16
26
26
8.9
6.1
12
8.9
3
3
9
0.1
1
1
2
3
0.2
41%
50%
81%
81%
28%
19%
38%
28%
PCE
25
11
12
20
20
8.6
6.4
12
9.4
3
3
7
0.1
0.4
1.6
2.1
2
0.3
44%
48%
80%
80%
34%
26%
48%
38%
E-Ben
34
20
20
30
31
14
12
21
18
5
5
11
1
0.5
2
3
2
0.8
59%
59%
88%
91%
41%
35%
62%
53%
p-Xyl
34
20
22
32
32
14
13
24
20
5
5
10
2
2
2
3
2
0.2
59%
65%
94%
94%
41%
38%
70%
59%
o-Xyl
33
23
24
33
33
17
18
31
26
7
5
10
2
2
2
3
2
0.6
70%
73%
100%
100%
52%
55%
94%
76%
*W-T white, elastic Teflon sheeting.
†A-F aluminum foil.
**T-T translucent, nonelastic Teflon sheeting.
††T-ST thin steel plate and translucent, nonelastic Teflon sheeting.
***Percent recovery relative to the control.
misleading; e.g., they show greater impacts than
both laboratory and field-contaminated soil
what would be experienced by field samples con-
samples. Table 5 shows the concentration stabil-
taminated some time in the past. For example,
ity of nine VOCs spiked into soil samples that were
held in En Core samplers and stored for two days
VOCs in field samples may be less readily avail-
under the conditions that are currently recom-
able than in spiked samples. The results in Table
mended by EPA and ASTM, as well as for 5 and
4, although not covering as many analytes, sup-
12 additional days at 12 3C. The results of this
port the laboratory-based experiments. Compar-
experiment were evaluated using a one-way
ing the TDCE, CDCE, and TCE mean concentra-
tions for field samples established on D0 vs. those
analysis of variance (ANOVA) and least signifi-
cance difference tests (Fisher's Protected LSD), at
established after two and four days of storage at 4
2C showed similar losses as seen for laboratory-
the 95% confidence level. This evaluation showed
treated soils stored under the same conditions.
that there were small but statistically significant
The En Core sampler was also evaluated using
losses of TDCE, CDCE, Ben, and Tol during the
11
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