TABLE 8-2 Summary of Methods for Estimating Intermedia Transfer Factors and Coefficient of Variation Associated with Estimation Errors

Factor Description and Symbol

Estimation Formula or Value

Coefficient of Variation Unitsa

Units

Key References

Octanol-water partition coefficient, Kow

Chemical specific

n/a

kg (water)/kg (octanol)

Lyman et al. 1982; Verschueren 1983; Howard 1990a,b, 1991

Organic-carbon partition coefficient, Koc

0.41 Kow

1

kg(water)/kg (carbon)

Karickhoff (1981)

Soil/soil-water partition coefficient, KD

foc × Koc

1

kg(water)/kg (soil solids)

Karickhoff (1981)

Plant-soil partition coefficient for surface soil due to rainsplash, rain Kps

0.0034

1

1 kg(soil)/kg (plant FM)b

Dreicer et al. (1984)

Plant-soil partition coefficient from root-zone soil to above-ground plant parts, Kps

7.7 K -0.58ow

4

kg(soil)/kg (plant FM)

Travis and Arms (1988)

Plant-soil partition coefficient from root-zone soil to roots (used for protected produce), Kps (roots)

270 K -0.58ow

4

kg(soil)/kg (plant FM)

Topp et al. (1986)

Plant-air partition coefficient for gas-phase contaminant, Kgsap Riederer (1990)

[0.5 + (0.4 + 0.01 × Kow) × (RT/H)] × 10-3

14

m3(air)/kg (plant FM)

Bacci et al. (1990)

Plant-air partition and coefficient for particle-bound contaminant, Kptap

3300

1.5

m3(air)/kg (plant FM)

McKone and Ryan (1989)

Biotransfer factor for meat concentration versus intake for beef cattle, Bt

2.5 × 10-8Kow

11

day/kg(meat)

Travis and Arms (1988)

Biotransfer factor for milk concentration versus intake for dairy cattle, Bk

7.9 × 10-9Kow

6

day/kg(milk)

Travis and Arms (1988)

Biotransfer factor for egg concentration versus intake for chickens, Be

1.6 × 10-6Kow

14

day/kg(eggs)

McKone (1993)

a A high coefficient of variation implies that the intermedia transfer factor is not well understood.

b FM refers to fresh mass.

Source: McKone 1993. Copyright 1993, Overseas Publishers AssociationN.V.; permission received from Gordon and Breach Publishers.



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