Additional comments • A similar TDI may be obtained by applying an uncertainty factor of
1000 (an additional uncertainty factor of 10 for adjustment from a
LOAEL to a NOAEL) to the LOAEL for renal effects of 1.9 mg/kg of
body weight per day in a 2-year NTP study in rats.
• The new guideline value applies to inorganic mercury, which is the
form found in drinking-water, whereas the previous guideline value
applied to total (inorganic and organic) mercury.