Table 5. Ratio (i.e., high:low) of analyte concentration (mg/kg) established for the soil samples

Figure 2. Linear partitioning between chamber vapor and membrane-covered water samples

Table 8. Experimental values for conversion coefficient

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Table 5. Ratio (i.e., high:low) of analyte concentra-

moisture is that it is not the dominant variable

tion (mg/kg) established for the soil samples. Sat-

relative to VOC sorption with respect to hydrated

urated condition of the CR-S soil is not included.

soils (Karickhoff et al. 1979, Chiou et al. 1983,

Conant et al. 1996). Thus, with the omission of the

saturated condition for the CR-S soil, a mean

value was used to further evaluate the relation-

ship between chamber analyte vapor and soil

concentrations (Table 6).

Among the three soils studied, the unsatu-

rated CR-S soil showed the highest analyte con-

centrations, while the other two soils had similar,

often overlapping analyte concentration ranges

(Table 6). The differences between analyte con-

centrations established for these soils were pre-

sumably due to their sorption capacity, of which

organic carbon plays an important role (Karick-

hoff et al. 1979, Chiou et al. 1983). As shown in

Table 1, the CR-S soil has the highest organic car-

In theory, soil vapor concentration can be

related to bulk soil concentration by the follow-

ing equation (Rong 1996):

CG = CT (ρb KH )/[Θ + (n - Θ)KH + ρb foc Koc ]

where CG = soil gas concentration in (mg/L)

Table 6. Mean value (mg/kg) and percent standard deviation for analyte concentration established for the

soil samples. Saturated condition of the CR-S soil is not included.

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