Page 197 - Partition & Adsorption of Organic Contaminants in Environmental Systems

188 CONTAMINANT SORPTION TO SOILS AND NATURAL SOLIDS

1600 40
p,p'-DDT
2,2',4,4',5,5'-PCB
1,2,4,-TCB 30

K d of p,p' -DDT and 2,2',4,4',5,5'-PCB 1200 20 * K d of 1,2,4,-TCB

800

*
400 10

0 0
0 200 400 600
Concentration of Triton X-100, X (mg/L)

Figure 7.35 Apparent K* values of p,p¢-DDT, 2,2¢,4,4¢,5,5¢-PCB, and 1,2,4-
d
trichlorobenzene with a soil (f om = 0.0017) as a function of TX100 concentration in
water at 23°C. [Data from Sun et al. (1995). Reproduced with permission.]

TABLE 7.19. Properties of Natural Sorbents Chosen for Contaminant Sorption
from Water with and without Triton X-100: SA = BET-N 2 Surface Area and
f om = Fraction of Organic Matter in Sorbent
2
Sorbent Abbreviation SA (m /g) f om ¥ 100
Ca-montmorillonite Bentonite 76 0.03
Taichung soil TCS 5.2 2.4
Chihsing Mountain soil CSMS 32 14.8
Florida peat Peat 1.3 86.4
Source: Data from Lee et al. (2000).