Registration Dossier
Registration Dossier
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EC number: 601-147-9 | CAS number: 111988-49-9
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
(Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide is photolytically degraded in pure water with a half-life of > 1 year (only direct photodegradation) and in natural water with a half-life of 42.5 days.
Key value for chemical safety assessment
- Half-life in water:
- 1 yr
Additional information
The endpoint “phototransformation in water” is not a data requirement for the registered substance. However, for the sake of completeness this endpoint is covered by a short summary of the available data. There are a total of three studies on the phototransformation in water available. All of which were performed according to GLP.
In the first study, the direct photodegradation of (Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide was investigated in pure water according to the ECETOC - method in polychromatic light. Direct photodegradation in water was assessed to be not relevant for the elimination of the test substance in the environment (DT50 = > 1 year).
The second study investigated the photolytic degradation of (Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide in aqueous buffer solution at pH 7. Under the experimental conditions used the test substance degraded very slowly with an experimental half-life of 79.7 days.
In a third study, the direct photodegradation of (Z)-3-(6-chloro-3-pyridylmethyl)-1,3-thiazolidin-2-ylidenecyanamide was investigated in natural water (Rhine river water) under irradiation with artificial sunlight. Under the experimental conditions used, the test substance degraded in natural water (Rhine river water) with an experimental half-life of 42.5 irradiation days, which corresponds to a calculated environmental half-life of 178 days under intensive solar conditions in Phoenix, AZ (USA).
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