Geology Reference
In-Depth Information
-3
-2
-1
0
1
2
3
4
5
4
1% octanol
6
3
Air
7
2
Air & Octanol
8
1
33% air
9
0
1%
a
ir
10
-1
0.1% air
11
Air
-2
&
12
-3
A & W & O
Water
13
-4
14
-5
15
-6
Octanol
16
-7
Water
17
-8
Water & Octanol
1% water
33%
o
ctan
o
l
33%
water
18
-9
-10
0
1
2
3
4
5
6
7
8
9
Log K
OW
Figure 4 K
aw
-K
ow
partitioning map with the distribution of 233 organic chemicals and
lines of equal F
a
,F
w
and F
o
; that is the chemical mass fractions in air (F
a
),
water (F
w
) and octanol (F
o
). The central region denoted 'A&W&O' is occupied
by chemicals which have mass fractions (41%) in all compartments of Air,
Water and Octanol and are therefore multi-media chemicals. Octanol repre-
sents organic-phases in the environment e.g. the organic carbon within soils and
sediments
From Gouin et al.
32
, courtesy of the American Chemical Society
for each compartment or medium would be required to determine their
overall persistence. Obviously the convergence point would change if a
different scenario was modelled, whereby the water compartment volume
was increased for example. However, out of the 233 chemicals included in
the figure,
B
34% had fractions 41% in each medium. If the chemicals
