There was slight recovery after 48 hours. In mammals PCNB is eliminated unchanged in the feces or as metabolites in urine. The speed and thoroughness of absorption varies among species. Eggs from chickens fed low doses of PCNB in their diets were considered safe for human consumption. Storage in the tissues did not occur in rats, dogs, or cows.
Impurities account for the prominent persistent residues.
Examination of various organs failed to reveal lesions. This would indicate that PCNB is either only slightly toxic or practically non-toxic to birds. PCNB is highly toxic to fish. PCNB has been shown to accumulate in aquatic animals and in aquatic plants. Algae accumulate the greatest amount.