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Description of key information

(2E)-1-[(6-chloropyridin-3-yl)methyl]-N-nitroimidazolidin-2-imine is photolytically degraded in soil with a half-life of 38.9 d.

Key value for chemical safety assessment

Half-life in soil:
38.9 d

Additional information

The endpoint “phototransformation in soil” 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.


One GLP-study on the photolytic degradation of the substance in soil is available. The photolysis study of (2E)-1-[(6-chloropyridin-3-yl)methyl]-N-nitroimidazolidin-2-imine on soil was carried out under continuous irradiation for maximum of 15 days by using an artificial light source at 25 ± 2°C. The study was done according to the EPA Guidelines Subdivision N Section 161-3 (1982). The radio-labeled parent compound was applied onto the soil layer at a concentration of 48.5 mg/kg. The sampling intervals were 0, 6 hours, 1, 2, 3 and 5 days (TEST I) and 0, 7, 12 and 15 days (TEST II). At the end of the irradiation for 15 days (TEST II), 91.6 % of the radioactivity applied was recovered and 61.5 % of the radiocarbon was found to be unchanged parent compound. The half-life of the substance was calculated by linear regression analysis to be 38.9 days (Rate constant K = 1.78 X 10E-02 1/day) under the conditions. The amount of radioactivity that could not be extracted from the soil ranged from 0.3 % to 11.0 % of the applied radioactivity. WAK 4103 was identified as the major photoproduct at the end of the irradiation period. It represented as much as 6.3 % of the applied radioactivity. None of the other extractable photoproducts was formed in amounts greater than 5 % of the applied radioactivity at any time during the irradiation.