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Long-term toxicity to fish

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For the substance as such, zinc bis(2-ethylhexanoate), no aquatic toxicity studies are available. Thus, read-across to the assessment entities soluble zinc substances and 2-ethylhexanoic acid is applied since the ions of zinc bis(2-ethylhexanoate) determine its fate and toxicity in the environment.

Zinc: Data on 7 freshwater species are available and the corresponding species NOECs range from 0.044 to 0.530 mg Zn/L (dissolved). Data for one marine species is available with a NOEC of 0.025 mg Zn/L (dissolved). The respective species NOEC/EC10 values are applied in the species sensitivity distribution approach.

2-ethylhexanoic acid: Regarding the long-term toxicity of 2-ethylhexanoate to freshwater fish, further testing is not considered to provide more insight into the environmental toxicity since (i) 2-ethylhexanoate has a low potential for aquatic toxicity, and (ii) is readily biodegradable. Further, NOEC/EC10 values for long-term toxicity to the acutely more sensitive aquatic invertebrates are well above the respective OECD test limit. According to the QSAR-based estimates of the model ECOSAR v.2.0, 2-ethylhexanoate has a very low potential for chronic toxicity to freshwater and saltwater fish with respective chronic values (ChV = 10^([log (LOEC x NOEC)]/2)) of 17.7 and 40.2 mg/L being well above 15 mg/L. Thus, long-term toxicity of 2 -ethylhexanoate to fish is highly unlikely.

Thus, zinc bis(2-ethylhexanoate) has some potential for long-term toxicity to marine and freshwater fish.

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