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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

The key value for risk assessment is based on a literature study with the wireworm with an LC50 of 6336 mg/kg soil dw.  

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil dwelling arthropods:
6 336 mg/kg soil dw

Additional information

There is one well described literature study (KSCN) with the wireworm (Limonius californicus). The wireworm study has been previously used to determine a PNEC value for soil, based on its close agreement with the background concentrations of SCN- in soil (~8 m/kg soil dw) (RIVM report 711701020, Ecotoxicological serious risk concentrations for soil, sediment and groundwater: updated proposals for first series of compounds; R. Posthumus and E.M.J. Verbruggen)). Because of the high LC50 obtained, this study is preferentially chosen to calculate the PNEC value, because it sets a higher upper limit that soil organisms can tolerate.

The results of the chemical safety assessment indicate no risk for the soil compartment. Additionally, according to the REACH TGD Chapter R.7c, requests for further information can be waived if log Kow < 5 and the compound is readily biodegradable. Ammonium thiocyanate is readily biodegradable in the OECD 301D closed bottle test (80%), and all the three thiocyanates have log Kow < 5. Based on this information, provision of especially data from long term tests is not necessary.