Environmental Engineering Reference
In-Depth Information
in which
C a,i =
concentration of contaminant in animal tissue i [mg/kg dw ]
I a =
average contaminant daily intake for the animal [mg/d]
B Ta , i
=
contaminant biotransfer factor for animal tissue i (meat, milk, egg)
[d/kg]
Depending on the available data, the concentration in animal tissue can also be
calculated with a bioconcentration factor (the ratio of animal tissue concentration
and the diet concentration):
I a
Q a , j ×
C a , i =
BCF a , i =
C j ×
BCF a , i
(11.6)
in which
BCF a,i =
bioconcentration factor for tissue i of animal a [-]
Q a,j =
daily quantity of media j ingested by animal a [kg/d]
C j =
animal-consumption-rate-weighed media concentration [mg/kg]
B Ta , i and BCF a,i are linked by the following expression:
BCF a , i
j
B Ta , i =
(11.7)
Q a , j
Dynamic Approaches
Meat Concentration
It is assumed that:
animals can be represented by a unique compartment in which contaminant has
a uniform concentration,
contaminant is eliminated and metabolised according to a first-order reaction rate.
Under these conditions the development of the contaminant concentration in the
animal can be described as follows:
dm a ,1
dt
=
f abs a ×
I a
k a m a ,1 λ a m a ,1
(11.8)
in which
m a ,1 =
mass of contaminant in the animal [mg]
f abs, a =
absorption fraction of contaminant by the animal [-]
I a =
contaminant daily intake of the animal [mg/d]
 
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