Table 3. WP detected by solvent extraction, SPME and field test.
Hot plate field test
Number of
Diameter of
WP conc.
WP mass (pg) detected
particles
residue
(g/g)†
Sample* ID
Isooctane**
SPME
detected
(mm)
BT-CC-1a
0.00094
3.8
6.0
old 248
0.0015
6.0
3.6
old 250
0.031
120
140
CP-CC-02††
0.55
2,200
>5,400
0
MHB site††
9.52
38,000
>11,000
7
0.43.7
CP-CC-01††
70.1
280,000
>11,000
1
3.5
CP-CC-03
<0.00088
ND
ND
CP-CC-04
<0.00088
ND
ND
CP-CC-05
<0.00088
ND
ND
CP-CC-06
<0.00088
ND
ND
CP-CC-07
<0.00088
ND
ND
CP-CC-08
<0.00088
ND
ND
CP-CC-09
<0.00088
ND
ND
MHR site
<0.00088
ND
ND
MW site 1
<0.00088
ND
ND
MW site 2
<0.00088
ND
ND
MW site 3
<0.00088
ND
ND
MW site 4
<0.00088
ND
ND
MW site 5
<0.00088
ND
ND
* Same sample used for isooctane extraction and SPME.
† WP concentration determined by isooctane (10 mL) extraction of 40-g sediment sample.
** WP mass detected in 1-L aliquot of 10-mL extract.
†† Samples were overrange. Isooctane extracts diluted to within linear range.
ND = Not detected
Table 4. Estimation of WP concentration based on the number and
diameter of WP particles detected by field method.
Estimated†
Diameter
Estimated* WP
Estimated**
of residue
particle diameter
mass of WP
WP conc.
(g/g)
Sample
(mm)
(mm)
particle (mg)
CP-CC-01
3.5
1.1
1.3
16.0
MHB site
3.7
1.2
1.5
1.6
0.6
0.2
1.5
0.6
0.2
1
0.5
0.09
0.6
0.4
0.04
0.6
0.4
0.04
0.4
0.3
0.03
26.1
Sum for MHB site = 2.1
* Asuming each particle is a sphere.
† Density of WP is 1.82 g/mL
** Based on 80 g of sediment (two 40-g subsamples).
hot plate field test, WP particles were detected in
and the assumption that each particle was spheri-
two out of the three samples (Tables 3 and 4). The
cal. WP concentrations for the samples where com-
diameter of the residue left by each particle was
parison was possible were estimated and found
measured, and the equation presented in Figure 6
to be of the same order of magnitude as that
used to estimate the diameter of each WP particle
obtained by the laboratory method. Since the pres-
prior to burning. The total mass of the WP was
ence or absence of one millimeter-size particle in
estimated based on the density of WP (1.82 g/mL)
a subsample would completely change the con-
7
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