SODIUM DICHLOROISOCYANURATE (ANHYDROUS and DIHYDRATE)
New specifications prepared at the 61st JECFA (2003), published in FNP 52 Add 11 (2003). An ADI of 2.0 mg/kg bw for the anhydrous form was established at the 61st JECFA (2003).
SYNONYMS Anhydrous: NaDCC; sodium dichloro-s-triazinetrione
Dihydrate: NaDCC dihydrate; sodium dichloro-s-triazinetrione dihydrate
DEFINITION NaDCC (anhydrous/dihydrate) is prepared by first reacting elemental chlorine with cyanuric acid in aqueous alkaline slurry to produce dichloroisocyanuric acid monohydrate. The latter is converted to the dihydrate of NaDCC, which may be heated to yield the anhydrous material. Both the dihydrate and the anhydrous material are produced as dry powders that can be granulated and packaged.
Chemical names 1,3-dichloro-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, sodium salt Triazine, 2,4,6(1H,3H,5H)-trione, 1,3-dichloro-, sodium salt 1,3-dichloro-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, sodium salt, dihydrate Triazine, 2,4,6(1H,3H,5H)-trione, 1,3-dichloro-, sodium salt, dihydrate
C.A.S. number Anhydrous: 2893-78-9
Dihydrate: 51580-86-0
Chemical formula Anhydrous: NaC3N3O3Cl2
Dihydrate: NaC3N3O3Cl2•2H2O
Formula weight Anhydrous: 219.95
Dihydrate: 255.98
Assay Available chlorine: not less than 62.0% (anhydrous) and 55.0% - 57.0% (dihydrate) Not less than 98% of NaDCC on the dried basis for both anhydrous and the dihydrate
DESCRIPTION Hygroscopic white crystalline powder or granules with a slight chlorine odour
FUNCTIONAL USESAntimicrobial agent for use in drinking water systems
