Soil/Sediment Produce Ingestion
Equation 7 (non-radionuclides), equation 8 (radionuclides), and Table 6 present the exposure variables for the soil/sediment produce ingestion pathway. The produce ingestion pathway is conducted for the agricultural scenario only.
(7)
(8)
Table 6. Soil/Sediment Produce Ingestion Parameters
Parameter
Units
Agricultural
|
Non-radionuclide chemical concentration in soil = Csn
mg/kg
Chemical-specific
Radionuclide chemical concentration in soil = Csr
pCi/g
Chemical-specific
Soil to plant uptake factor (wet) = BVwet
kg/kg
Chemical-specific
Mass loading factor = MLF
unitless
0.26
(Pinder and McLeod 1989)
Conversion factor = CF5
g/kg
1000
Diet fraction = FIv
unitless
0.4
(EPA 1989b)
Ingestion rate = IRv
kg/d
0.2
(EPA 1989b)
Exposure frequency = EF
d/year
350
(EPA 1989a)
Exposure duration = ED
years
30
(EPA 1989a)
Conversion Factor = CF2
days/yr
365
Body weight (adult) = BW
kg
70
(EPA 1989a)
Lifetime = LT
years
70
(EPA 1989a)
Averaging time = AT
years
LT (carcinogen)
ED (noncarcinogen)