Registration Dossier
Registration Dossier
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EC number: 246-279-4 | CAS number: 24468-28-8
Endpoint summary
Administrative data
Description of key information
The fate and toxicity of zinc cyanurate in the environment is most accurately evaluated by separately assessing the fate of its constituents zinc and cyanurate.
In transformation/dissolution tests according to the OECD Series on Testing and Assessment Number 29 (2001) with a loading of 1 mg/L, a nearly complete dissolution of zinc cyanurate was already observed after 24 h resulting in dissolved Zn concentrations of 173 microg Zn/L at pH 6 and 164 microg Zn/L at pH 8 (corresponding to 854 and 811 microg/L zinc cyanurate, respectively). Thus, zinc cyanurate is soluble and expected to dissociate upon contact with water and to release zinc cations and cyanurate anions. The respective dissociation is reversible and the ratio of the salt /dissociated ions is dependent on the metal-ligand dissociation constant of the salt, the composition of the solution and its pH.
In the assessment of enviromental fate of zinc cyanurate, read-across to the assessment entities soluble zinc substances and cyanuric acid is applied since the ions of zinc 5 cyanurate determine its environmental fate and toxicity. Since zinc cations and cyanurate anions behave differently in the environment, including processes such as stability, degradation, transport and distribution, a separate assessment of the environmental fate and toxicity of each assessment entity is performed. Please refer to the data as submitted for each individual assessment entity.
Zinc: Hydrolysis and biodegradation are not relevant for zinc. Zinc is an essential element that is actively regulated by organisms. Bioconcentration and bioaccumulation are not considered to be relevant for inorganic zinc substances. The coefficient for partitioning of zinc between particulate matter and water (Kpsusp) of 109,648 L/Kg was derived for EU waters whereas the Kp for the distribution between sediment and water (Kpsed) was estimated with 73,000 L/kg. For saltwater, a partition coefficient water/suspended matter of 6010 L/kg was derived. For soil, a solids-water partitioning coefficient of 158.5 L/kg was determined experimentally.
Cyanuric acid: Regarding abiotic degradation, cyanuric acid does not hydrolyse in water at pH 3 -7. Cyanuric acid may not be considered as ready biodegradable. Cyanuric acid is weakly adsorbed and mobile in soils. Respective Koc values range from 8 – 150 L/Kg.
Additional information
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