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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

Three terrestrial plant studies with EDTA salts or complexes have been performed, examining different end-points (vegatative vigour and seedling emergence) in different plant species. In the 21d veg vigour study (Evangelou et al., 2006) a true NOEC could be established, while in the 14d seedling emergence test (Geebelen et al., 2002) no effect was observed at the highest tested dose. Recalculation of the NOEC from EDTA-Na2H2 to EDTA-ZnNa2 will give a NOEC of 100 mg/kg soil dw.

An terrestrial plant study with EDTA-ZnK2 according to OECD 208 resulted in a NOEC of 1000 mg/kg dw for the emerged seedlings, A NOEC of 250 mg/kg dw for Rape and soybeen for shootheight and a NOEC of 125 mg/kg dw for rape for shoot freshweight. The lowest EC50 491 mg/kg dw was also observed for rape shoot freshweight.

Recalculating the EDTA-ZnK2 results to EDTA-ZnNa2 (see for justification chapter 13) an EC50 for EDTA-ZnNa2 is calculated of 491*399.6/431.8 = 454 mg/kg dw.

The EDTA-ZnK2 used for the test contained 90.4% active ingredient. The EC50 of 454 mg/kg dw therefore needs the be corrected for the active content to 410.8 mg a.i. EDTA-ZnNa2/kg dw.

This result will be used for the terrestrial hazard assessment.

Key value for chemical safety assessment

Short-term EC50 or LC50 for terrestrial plants:
410.8 mg/kg soil dw

Additional information

The hazard assessment of EDTA-ZnNa2 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.