Selenium, Elemental

CAS RN:7782-49-2

CERCLA Quantities

Persons in charge of vessels or facilities are required to notify the National Response Center (NRC) immediately, when there is a release of this designated hazardous substance, in an amount equal to or greater than its reportable quantity of 100 lb or 45.4 kg. The toll free number of the NRC is (800) 424-8802. The rule for determining when notification is required is stated in 40 CFR 302.4 (section IV.D.3.b). [No reporting of releases of this hazardous substance is required if the diameter of the pieces of the solid metal released is larger than 100 micrometers (0.004 inches).]
Reportable Quantities for Radionuclides
Radionuclide Atomic Number Final RQ Curie(Bequerel)
Selenium-70 34 1000 (3.7E 13)
Selenium-73m 34 100 (3.7E 12)
Selenium-73 34 10 (3.7E 11)
Selenium-75 34 10 (3.7E 11)
Selenium-79 34 10 (3.7E 11)
Selenium-81m 34 1000 (3.7E 13)
Selenium-81 34 1000 (3.7E 13)
Selenium-83 34 1000 (3.7E 13)
Find more information on this substance at: Hazardous Substances Data Bank , TOXNET , PubMed