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EC number: 203-614-9 | CAS number: 108-77-0
Endpoint summary
Administrative data
Description of key information
Additional information
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).
Hydrolysis
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 = constant).
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.
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