Halazone ( 4-(dichlorosulfamoyl)benzoic acid) is a chemical compound whose chemical formula can be written as either or . It has been widely used to disinfect drinking water.
Other names for this compound include p-sulfondichloramidobenzoic acid, 4-(dichloroamino)sulfonylbenzoic acid, and Pantocide.
Halazone tablets were commonly used during World War II by U.S. soldiers for portable water purification, even being included in accessory packs for until 1945.
Halazone was widely used by Marine infantry units during the Vietnam War. Halazone has largely been replaced in that use by sodium dichloroisocyanurate. The primary limitation of halazone tablets was the very short usable life of opened bottles, typically three days or less, unlike iodine-based tablets which have a usable open bottle life of three months.
Dilute halazone solutions (4 to 8 ppm of available chlorine) has also been used to disinfect , and as a spermicide.
Another synthesis route is the oxidation of dichloramine-T with potassium permanganate in a mild alkaline medium.
See also
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