Hello,
we are going to assess the XFind for Cr, using the analyzed data about the concentration of Cr in pork - Csub (by INAA method), can we use this formula for BTF measurement:
BTF = Csubstrate/Ichemical
When using your own measured data, it is correct that the BTF can be applied as:
BTF [d/kg pork] = concentration in pork [kg chemical/kg pork] / chemical intake rate of animal [kg chemical/d]
The BTF can then be used to derive a BAF for e.g. water intake as:
BAF [l water/kg pork] = BTF [d/kg pork] x intake rate of water [l water/d]
Finally, BAF is then used to arrive at the XF for pork ingestion as described in eq. 131 of the USEtox documentation.
When using your own measured data, it is correct that the BTF can be applied as:
BTF [d/kg pork] = concentration in pork [kg chemical/kg pork] / chemical intake rate of animal [kg chemical/d]
The BTF can then be used to derive a BAF for e.g. water intake as:
BAF [l water/kg pork] = BTF [d/kg pork] x intake rate of water [l water/d]
Finally, BAF is then used to arrive at the XF for pork ingestion as described in eq. 131 of the USEtox documentation.