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Read-across to the assessment entities soluble zinc substances and m-toluic acid is applied for the assessment of zinc m-toluate since the ions of zinc m-toluate determine its fate and toxicity in the environment. Reliable data available for soluble zinc substances and m-toluate indicate that the moiety of ecotoloxicological concern are zinc cations.

 

Acute (short-term) toxicity data: The lowest EC/LC50 values of 3 trophic levels (algae, invertebrates and fish) for zinc range from are 0.136 mg Zn/L to 0.78 mg Zn/L depending also on solution pH and hardness and for m-toluate from 17.87 mg/L to 81.4 mg/L m-toluate.  

Chronic (long-term) toxicity: For zinc, 23 distinct chronic species ecotoxicity values were used applying the SSD approach and “species mean” NOEC values used for PNEC derivation range from 19 to 530 µg/L with a resulting HC5 of 20.6 µg Zn/L. For m-toluate, NOEC/EC10 values of 2 trophic levels (algae and invertebrates) range from 9.63 mg/L to 9.93 mg/L m-toluate.  

Regarding the toxicity to aquatic microorganisms, the lowest NOEC for nitrification inhibition amounts to 0.1 mg Zn/L based on an ISO 9509 nitrification inhibition test whereas an EC10 of 543 mg/L m-toluic acid (nominal) was derived for the 3-h respiration inhibition of activated sludge with a corresponding EC50 >= 1000 mg/L.

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