Registration Dossier
Registration Dossier
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EC number: 283-563-7 | CAS number: 84682-03-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Studies of the aquatic toxicity of zinc 3,5,5-trimethyl hexanoate are not available. Read-across to the assessment entities soluble zinc substances and trimethyl hexanoic acid is applied for the assessment of zinc 3,5,5-trimethyl hexanoate since the ions of zinc 3,5,5-trimethyl hexanoate determine its fate and toxicity in the environment.
Reliable data available for soluble zinc substances and trimethyl hexanoate and its structural analogue neodecanoic acid indicate that the moiety of ecotoxicological concern are zinc cations. Regarding the toxicity of zinc to freshwater algae, the lowest IC50 value amounts to 0.136 mg Zn/L and the lowest NOEC/EC10 values to 0.019 mg Zn/L and 0.0078 mg Zn/L for freshwater algae and marine algae, respectively. Data of neodecanoic acid, i.e. the structural analogue of trimethyl hexanoic acid, indicate a low toxic potential to freshwater algae with a 72-h EL50 of >100 mg/L neodecanoic acid. This is supported by QSAR-based estimations for trimethyl hexanoic acid. According to the QSAR-based outcome of the model ECOSAR v.2.0, trimethyl hexanoic acid has also a low potential for toxicity to algae as the 96-h EC50 and the ChV (ChV = 10^([log (LOEC x NOEC)]/2)) were estimated with 65.0 mg/L and 22.4 mg/L, respectively.
Key value for chemical safety assessment
Additional information
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