Page 35 - Partition & Adsorption of Organic Contaminants in Environmental Systems

26 FUNDAMENTALS OF THE SOLUTION THEORY

TABLE 2.1. Solubilities in Water of 1,2,3,7-Tetrachlorodibenzo-p-dioxin (T 4CDD),
1,2,3,4,7-Pentachlorodibenzo-p-dioxin (P 5CDD), 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin
(H 6CDD), and 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin (H 7CDD) as a Function of
Temperature
Solubility in Water, S w (mol/L)
Temp.
(°C) T 4 CDD P 5 CDD H 6 CDD H 7 CDD
7.0 (7.56 ± 0.20) ¥ 10 -10 (1.42 ± 0.01) ¥ 10 -10 (5.91 ± 0.05) ¥ 10 -12 (2.20 ± 0.09) ¥ 10 -12
11.5 (8.12 ± 0.11) ¥ 10 -10 (1.88 ± 0.01) ¥ 10 -10 (7.98 ± 0.15) ¥ 10 -12 (2.69 ± 0.01) ¥ 10 -12
17.0 (12.5 ± 3.6) ¥ 10 -10 (2.44 ± 0.01) ¥ 10 -10 (10.7 ± 0.4) ¥ 10 -12 (3.04 ± 0.06) ¥ 10 -12
21.0 (14.9 ± 2.1) ¥ 10 -10 (3.45 ± 0.08) ¥ 10 -10 (12.5 ± 1.2) ¥ 10 -12 (5.40 ± 0.77) ¥ 10 -12
26.0 (22.6 ± 1.0) ¥ 10 -10 (4.63 ± 003) ¥ 10 -10 (20.2 ± 0.4) ¥ 10 -12 (6.03 ± 0.18) ¥ 10 -12
41.0 (43.3 ± 5.4) ¥ 10 -10 (12.8 ± 0.1) ¥ 10 -10 (48.6 ± 1.4) ¥ 10 -12 (14.9 ± 0.5) ¥ 10 -12
Source: Data from Friesen and Webster (1990).

-22

T 4 CDD
-24
P 5 CDD

-26
ln x°

H 6 CDD
-28

H 7 CDD

-30

-32
3.15 3.30 3.45 3.60
(1/T) x 10 3
Figure 2.3 Temperature dependence of the water solubilities of four polychlori-
nated dibenzo-p-dioxins. [Data from Friesen and Webster (1990). Reproduced with
permission.]