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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Link to relevant study record(s)

Description of key information

One acute toxicity study with earthworms is available for an EDTA-Zn complex i.e. EDTA-ZnK2(Winkelmann, 2019). The EC50 for weight was determined to be >1000 mg test item/kg dw. The active ingredient content of the test item was 90.4 %. The EC50 for weight based on active was thus >904 mg a.i./kg dw.

In terms of body weight loss, the NOEC was determined to be 316 mg/kg soil dry weight and LOEC was determined to be 1000 mg/kg soil dry weight. Corrected for active ingredient this results in a NOEC and LOEC of 285.6 and 904 mg/kg dw. For read across to EDTA-Zn(NH4) these values need to be corrected for their difference in MW (see for justification chapter 13) with a ratio of 389.7/431.8 resulting in a NOEC of 257.8 mg/kg dw.

Only one acute toxicity study with earthworms is available for EDTA-H4 (Edwards, 2009). The EC50 was determined at 156 mg/kg soil dry weight.

This corresponds to 208 mg/kg soil dw EDTA-Zn(NH4)2.

The study from Winkelmann will be, based on the higher quality, be used for the terrestrial hazard assessment.

Key value for chemical safety assessment

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

Additional information

The hazard assessment of EDTA-Zn(NH4)2 reveals neither a need to classify the substance as dangerous to the environment, nor is it a PBT or vPvB substance. The substance is expected to have a low potential for adsorption based on its ionic structure under environmental relevant pH conditions and its low log Kow , the low log Kow also indicates that the substance will not be bioaccumulative. There are no further indications that the substance may be hazardous to the environment.