Chlorine

Also known as: Chlorine gas, Bertholite, Caswell No. 179
Chemical reference number (CAS): 7782-50-5

Chlorine is a poisonous, greenish-yellow gas described as having a choking odor. It is a very corrosive, hazardous chemical. Usually combined with other chemicals, it is used to disinfect water, purify metals, bleach wood pulp and make other chemicals.

Household bleach, used to whiten fabrics or remove mold from surfaces, is a 5% solution of a stabilized form of chlorine.

DO NOT MIX household bleach with acid-containing or ammonia-containing cleaners. Dangerous levels of a very harmful gas can be released.

 

Most of the chlorine that enters lakes, streams, or soil evaporates into the air or combines with other chemicals into more stable compounds. Chlorine-containing chemicals that seep through soil down into groundwater can remain unchanged for many years.

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Last Revised: December 30, 2015