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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

LC50_96h of 1,2,4-triazole was estimated to be higher than 97 mg/L.

Key value for chemical safety assessment

Additional information

A test with the sodium salt (sodium 1,2,4 -triazol-1-ide) has been performed according to OECD 203 guideline and GLP requirements (Thiebaud, 2001). Under environmental conditions, the sodium salt is reactive with water, and the 1,2,4-

triazole can therefore be considered as its degradation product. On this basis it seems reasonable to use the available data to assess the toxicity of the 1,2,4 -triazole. The substance was not lethal to Danio Rerio exposed for 96h to the measured concentration of 97mg/L. Another study has been performed according to OECD 203 guideline on Oncorhynchus mykiss with 1,2,4-triazole (Rufi, 1983). LC50_96h has been determined to be 760 mg/L expressed in terms of nominal concentrations. But the concentration was not maintained during the test.