Table 7. Means and standard deviations of triplicate analyte values for experiment III performed
with vapor-fortified CR-B soil. For each analyte with the same method of sample preparation and
analysis, values with the same letter (or no letter at all) are not significantly different from each other.
Analyte concentration (g/g)
Method
Time
TDCE
CDCE
Ben
TCE
Tol
PCE
E-Ben
p-Xyl
o-Xyl
HS-NaHSO4
12 hr
0.68c
1.53a
1.40a
1.64a
2.54a
2.49a
2.56a
2.41b
2.36b
0.05
0.12
0.08
0.07
0.05
0.07
0.12
0.06
0.05
HS-NaCl/H3PO4
12 hr
0.45d
1.15b
0.99c
1.05c
1.61c
1.62c
1.58c
1.40d
1.37b
0.02
0.01
0.01
0.02
0.01
0.03
0.02
0.03
0.05
Heated HS
12 hr
1.28a
1.12b
1.04bc
1.34b
1.57c
1.95b
1.20d
1.09e
0.93e
0.02
0.08
0.02
0.03
0.01
0.03
0.01
0.02
0.01
<2 hr
MeOH
0.89b
1.47a
1.14b
1.52a
2.26b
2.29a
2.59a
2.76a
2.79a
0.02
0.00
0.01
0.05
0.08
0.10
0.10
0.14
0.07
<2 hr
Tetraglyme
0.50d
1.10b
0.76d
1.04c
1.45c
1.64c
1.81c
1.71c
1.63c
0.07
0.11
0.08
0.11
0.12
0.16
0.13
0.18
0.10
<2 hr
PPG
0.51d
0.99b
0.68d
0.91c
1.10d
1.34d
1.26d
1.20de
1.18d
0.09
0.19
0.14
0.18
0.25
0.30
0.22
0.33
0.24
MeOH
2 days
2.47
2.37
1.54
2.44
3.44
3.46
4.04
4.99
4.40
0.04
0.03
0.04
0.07
0.17
0.11
0.18
0.16
0.23
Tetraglyme
2 days
0.68
1.26
0.93
1.22
1.89
2.14
2.40
2.48
2.42
0.02
0.15
0.10
0.11
0.12
0.14
0.17
0.11
0.16
PPG
2 days
0.59
1.11
0.76
1.04
1.32
1.57
1.49
1.39
1.31
0.06
0.17
0.12
0.16
0.27
0.29
0.32
0.25
0.25
MeOH
4 days
2.83
2.68
1.58
2.52
3.52
3.04
3.85
4.97
4.30
0.04
0.03
0.07
0.09
0.11
0.17
0.35
0.40
0.37
Tetragylme
4 days
0.69
1.27
0.96
1.18
2.04
2.05
2.50
2.76
2.58
0.21
0.14
0.09
0.11
0.17
0.16
0.18
0.22
0.28
PPG
4 days
0.64
1.21
0.82
1.11
1.46
1.63
1.65
1.58
1.48
0.06
0.14
0.09
0.14
0.20
0.24
0.24
0.21
0.26
MeOH
29 days
4.09
3.77
2.16
4.03
4.80
4.44
5.04
6.66
5.54
0.08
0.06
0.05
0.17
0.07
0.02
0.07
0.19
0.17
Tetragylme
29 days
0.77
1.34
1.04
0.99
2.46
2.23
3.17
3.49
3.36
0.25
0.17
0.06
0.20
0.13
0.15
.015
0.20
0.25
PPG
29 days
0.77
1.26
0.85
1.25
1.55
1.79
1.78
1.80
1.59
0.07
0.14
0.13
0.18
0.29
0.30
0.36
0.41
0.21
* See Table 2 for full names.
determine which values were significantly differ-
sample preparation methods for vapor-fortified
ent.
samples. For this six-method comparison, samples
Figure 3 gives plots of the mean concentrations
were either prepared and analyzed within 2 hours
established for the three solvents for each extrac-
or a solvent aliquot was removed within 2 hours
tion period. In each figure, points designated with
of the ampoule contents being dispersed. This
a different letter are significantly different at the
table also shows the results for three additional