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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

Read-across from an acute earthworm toxicity test according to OECD Guideline 207 with the monosodium salt of cyanuric acid.

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
1 282.8 mg/kg soil dw

Additional information

A study was performed to assess the acute toxicity of the monosodium salt of cyanuric acid to earthworms (Eisenia foetida) in an artificial soil (Goodband 2007). 60 earthworms (six replicates of 10 worms) were exposed to a single concentration of 1000 mg test material/kg of dry soil for a period of 14 days. The number of mortalities was determined after 7 and 14 days exposure. The 14 day LC50 for the test material based on nominal test concentrations was > 1000mg test material/kg dry soil (equivalent to 756 mg cyanuric acid/kg dry soil). The NOEC was 1000 mg test material/kg dry soil (equivalent to 756 mg cyanuric acid/kg dry soil).

Read-across:

1. Based on the experimental results obtained with the analogue monosodium salt of cyanuric acid (14 d-LC50 > 1000 mg/kg soil dw ; 14d-NOEC = 1000 mg/kg soil dw) and the molecular weights, the read-across approach is applied and the 14d-LC50 and 14d-NOEC for substance trisodium cyanurate are calculated to be higher than 1282.8 mg/L and 1282.8 mg/L, respectively.