A toxic heavy metal has a whole body half-life of about 16 years. a) The ADI (RfD) of this metal for food is 2.3 × 10-3 mg kg-1 d-1. What is the acceptable daily intake for a 75 kg person? b) What is the whole body level of this metal if ingestion were maintained at ADI? [Hint: Atmospheric residence time analysis calculations are very similar.]