Bioaccumulation of chemicals via exposure to contaminated air
can be characterized by a bioaccumulation factor, which equals the
total internal concentration (Ci) divided by the concentration in air
(CA). In contrast to PBPK-models, the internal chemical concentration
is not estimated at a specific site (i.e. liver, kidney and circulation), but
represents the total internal chemical concentration in the body. The
model objective is to estimate the bioaccumulation potential of VOCs
and to provide insight in differences in magnitude of inhalation rate
constants and exhalation rate constants across species and chemicals.
For this purpose a one-compartment model is considered sufficient. If
exposure occurs only via inhalation of air, this bioaccumulation factor
can be estimated as the inhalation rate constant divided by the total
elimination rate (Eq. (2)). The equations for excretion via urine,
egestion with faeces and growth dilution have been developed by
Hendriks et al. (2001) and are provided in the Supporting Information.
The development of the inhalation and exhalation rate constants
is described in the next section.
Bioaccumulation of chemicals via exposure to contaminated aircan be characterized by a bioaccumulation factor, which equals thetotal internal concentration (Ci) divided by the concentration in air(CA). In contrast to PBPK-models, the internal chemical concentrationis not estimated at a specific site (i.e. liver, kidney and circulation), butrepresents the total internal chemical concentration in the body. Themodel objective is to estimate the bioaccumulation potential of VOCsand to provide insight in differences in magnitude of inhalation rateconstants and exhalation rate constants across species and chemicals.For this purpose a one-compartment model is considered sufficient. Ifexposure occurs only via inhalation of air, this bioaccumulation factorcan be estimated as the inhalation rate constant divided by the totalelimination rate (Eq. (2)). The equations for excretion via urine,egestion with faeces and growth dilution have been developed byHendriks et al. (2001) and are provided in the Supporting Information.The development of the inhalation and exhalation rate constantsis described in the next section.
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