Geoscience Reference
In-Depth Information
Table 7.1 Vapor pressure and Henry's constant for various organic compounds at 25 C (Stumm and Morgan
1996
)
Compound A
H
sat
¼
K
sa
H
RT
¼
½
A
ð
aq
Þ
Molecular weight
Water solubility
[A
(aq)
](M)
Vapor pressure
p
A
o
Concentration in gas phase
(A
o
)
g
= p
A
o
/RT (mol/L)
ð
A
Þ
g
(atm)
Alkanes
n-Octane (C
8
H
18
)
5.8 9 10
-6
1.8 9 10
-2
7.5 9 10
-4
7.7 9 10
-3
114
7.0 9 10
-4
2.5 9 10
-1
1.0 9 10
-2
7 9 10
-2
1-Hexane (C
6
H
12
)
84
Aromatic substances
Benzene
2.3 9 10
-2
1.2 9 10
-1
5.1 9 10
-3
78
4.5
5.6 9 10
-3
3.7 9 10
-2
1.5 9 10
-3
Toluene
92
3.7
2.6 9 10
-4
1.0 9 10
-4
4.3 9 10
-6
6.1 9 10
1
Naphthalene
128
4.9 9 10
-5
7.5 9 10
-5
3.1 9 10
-6
1.6 9 10
1
Biphenyl
154
Pesticides
p,p
0
-DDT (C
14
H
9
Cl
5
)
1.4 9 10
-8
1.3 9 10
-10
5.4 9 10
-12
2.6 9 10
3
355
2.6 9 10
-5
8.3 9 10
-8
3.4 9 10
-9
7.6 9 10
3
Lindane
291
5.8 9 10
-7
6.6 9 10
-9
2.7 9 10
-10
2.1 9 10
3
Dieldrin
381
Polychlorinated biphenyls (PCBs)
2,2
0
4,4
0
-CBP (C
12
H
6
Cl
4
)
2.0 9 10
-8
6.2 9 10
-9
2.5 9 10
-10
292
79
1.9 9 10
-9
2.2 9 10
-10
9.2 9 10
-12
2.1 9 10
2
2,2
0
3,3
0
4,4
0
-CBP (C
12
H
4
Cl
6
)
361
Other
Dimethylsulfide (C
2
H
6
S)
3.5 9 10
-1
6.3 9 10
-1
2.6 9 10
-2
1.4 9 10
1
62
Mercury (Hg
o
)
1.5 9 10
7
1.7 9 10
-6
201
7 9 10-8
2.1
3.1 9 10
-2
1.3 9 10
-3
(4.3 9 10
4
)
Water
18
(55.5)
