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Ecotoxicological information

Toxicity to soil microorganisms

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The terrestrial chemical safety assessment has been conducted using the Equilibrium Partitioning method (EQPM)*.

It is recognised that the aquatic PNEC used in the EQPM does not take into account any indicator for effects in aquatic microorganisms. However a reliable study performed with Na/H salt of EDTMP is available and records an EC50 value of >100 mg/l (Brixham 1987).

This is a similar level of effect observed in lowest reliable short-term aquatic toxicity study with osberved with fish where a 96-h LC50 400 mg active acid/L with O. mykiss was observed (ABC 1980). Therefore it is unlikely that the PNECterrestrial based on aquatic ecotoxicity test results would not be protective for terrestrial microorganisms. The chemical safety assessment using EQPM does not suggest any unacceptable risks for the terrestrial compartment.

*A reproductive toxicity study with earthworms (OECD TG 222) is proposed, which may affect the current RCRs.

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