removed for analysis after several days of stor-
greater losses occur when sample collection and
age, are often reduced in VOC concentration by
handling operations do not maintain the structur-
between 90 and 99.9% as compared to samples
al integrity or limit atmospheric exposure (Hewitt
collected using a single nondisruptive transfer
et al. 1995). For instance, bulk samples that are
method (Hewitt 1994, Hewitt et al. 1995). Clearly,
transferred to glass bottles using spatulas, spoons,
how the sample is collected and handled has a
or paint scrapers, from which subsamples will be
14
12
12
10
8
8
6
Ben
Ben
Tol
Tol
E-Ben
4
4
E-Ben
p-Xyl
p-Xyl
o-Xyl
o-Xyl
TDCE
TDCE
2
TCE
TCE
PCE
PCE
0
0
4
8
12
16
20
4
8
12
16
20
Holding Time (days)
Holding Time (days)
Figure 4. Set 1/trial 1. Contaminated soil stored at 22C.
Figure 6. Set 1/trial 1. Contaminated soil preserved
with NaHSO4 and stored at 22C.
20
Ben
Tol
E-Ben
p-Xyl
16
o-Xyl
TDCE
TCE
12
PCE
12
8
8
Ben
Tol
4
E-Ben
4
p-Xyl
o-Xyl
TDCE
TCE
PCE
0
4
8
12
16
20
0
1
2
3
4
5
Holding Time (days)
Holding Time (days)
Figure 5. Set 1/trial 1. Contaminated soil stored at
Figure 7. Set 1/trial 4. Contaminated soil stored
4C.
at 22C.
10
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