Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 203-614-9
CAS number: 108-77-0
Phototransformation in air
The atmospheric oxidation potential (AOP)
predicted from the Epiwin program indicates that cyanuric chloride is
not photolytically reactive (degradation half-life of > 15 year).
Measurements revealed a fast and stepwise
hydrolysis of cyanuric chloride. The intermediate and final degradation
products of cyanuric chloride were identified as
2,4-dichlor-6-hydroxy-1,3,5-triazine (first intermediate, DT50(pH 7.0,
T=298.15 K = 0.52 h = 31.5 min), 2-chlor-4,6-dihydroxy-1,3,5-triazine
(also named 6-chloro-1,3,5-triazine-2,4(1H,3H)-dione, sodium salt)
(second intermediate, CAS no.: 32998-00-8, DT50 (pH 7.0, T=298.15 K)=
3.98 h =239.0 min ) and cyanuric acid (final degradation product, CAS
no: 108 -80-5), respectively.
In this non guideline study the half-times
for the first hydrolysis step of cyanuric chloride were determined to be
- DT50(pH 2.0, T=298.15 K = 1.2 min
- DT50 (pH 4.0, T=313.15 K)= 1.65 min
- DT50(pH 7.0, T= 298.15 K) = 3.47 min.
The rates of hydrolysis rise significantly
for all three steps at acidic medium and are slower at basic pH (for T =
The activation energy is idependent from pH
and equal for the three hydrolysis steps.
Phototransformation in water
Cyanuric acid (concantration: ca. 275 mg/L)
was treated both with UV radiation and with UV-irradiated H2O2. After 30
minutes treatment the concentration of the the test item (cyanuric acid)
that was treated with UV radiation and with UV-irradiated H2O2 was
determined to be ca. 225 mg/L and ca. 275 mg/L, respectively. Since
these concentrations do not differ strongly from the initial test item
concentration, photodegradation of the test item is not considered.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again