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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

ZINC DILAURATE:  
The acute toxicity of zinc dilaurate to fish is above the water solubility limit ranging from 5.2 to 6.4 mg/L. For a comprehensive overview of the ecotoxicity of zinc, see the hazard assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 (see Appendix 1 of the CSR).
ZINC:
Key data (lowest LC50 values) are:
-for Oncorrhynchus Mykiss: 0.169 mg Zn/l (single value) at neutral/high pH and low hardness
-for Pimephales promelas (single values) : 0.780 mg Zn/l at low pH (high hardness) and 0.330 mg Zn/l at neutral/high pH, high hardness
-for Pimephales promelas: LC50 0.780 mg Zn/l (at low pH); 0.33mg Zn/l at neutral/high pH

Key value for chemical safety assessment

Additional information

ZINC DILAURATE:

Information on acute fish toxicity is available from a study performed according to OECD Guideline 203. Fish (Danio rerio) were exposed for 96 hours to nominal concentrations of 0 (control), 0.1, 1, 10 mg/L under static conditions. At all tested concentrations, including the highest nominal test concentration, neither behavioural abnormalities nor mortality occurred. The acute toxicity of zinc dilaurate to fish is above the water solubility limit ranging from 5.2 to 6.4 mg/L.

Regarding zinc salts of longer-chain Fatty acids, fish toxicity data of a structural analogue, i.e. fatty acids, C16-18, zinc salts, are available from a study performed according to EU Method C.1 (Acute Toxicity for Fish) in the former version of 1992 (Henkel KGaA, 1995), from a study performed according to OECD Guideline 203 (Fish, Acute Toxicity Test) but reported only in a short study report (TÜV Bayern Sachsen E.V., 1992) and from an old publication (Dowden and Bennett, 1965). In the most reliable study (Henkel KGaA, 1995), the acute toxicity of Fatty acids, C16-18, zinc salts to fish was investigated according to EU Method C.1 (Acute Toxicity for Fish) in the former version of 1992. Fish (Danio rerio) were exposed for 96 hours to nominal concentrations of 0 (control), 1000, 3000 and 10000 mg/L under semi-static conditions. Up to and including the highest nominal test concentration neither behavioural abnormalities nor mortality occurred. The test was conducted at nominal concentrations far exceeding the water solubility by 3 to 4 orders of magnitude. Due to the high level of nominal test concentrations and the measures used to disperse the test substance in the test medium, it is likely that the actual test concentrations covered the water solubility limit which is in the range of 1 mg/L (c.f. EU risk assessment zinc distearate carried out within the framework of EU Existing Chemicals Regulation (EEC) No 793/93 (Final report R074_0805_env, May 2008). Effects were also not observed at nominal fatty acids, C16 -18, zinc salts concentrations up to the water solubility limit in two further studies. In accordance with the evaluation of the EU Risk assessment, from the results of these tests it is concluded, that the toxicity of the substance fatty acids, C16-18, zinc salts to fish is (far) above the water solubility limit of around 1 mg/L.

Thus, acute toxicity data from another structural analogue, i.e. zinc distearate - the zinc salt of a longer-chained fatty acid (C16-18), support the conclusion that zinc salts of fatty acids with a similar structural analogy, water solubility and zinc content are not toxic to fish at concentrations below the respective water solubility limit.

For a comprehensive overview of the ecotoxicity of zinc, see the hazard assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 in Appendix 1 of the CSR and cited in excerpts below.:

ZINC:

Good quality and relevant data for 5 species. Tests were done according to standard protocol or equivalent.

Data are grouped per species according to

-pH: low (6 -<7) - neutral/high (7 -8.5)

-and hardness: low/medium (<100mg CaCO3/l) and medium/high (>100 mg CaCO3/l).

Fish are generally less sensitive than invertebrates and algae.

Key data (lowest LC50 values) are:

-for Oncorrhynchus Mykiss: 0.169 mg Zn/l (single value) at neutral/high pH and low hardness

-for Pimephales promelas (single values) : 0.780 mg Zn/l at low pH (high hardness) and 0.330 mg Zn/l at neutral/high pH, high hardness

-for Pimephales promelas: LC50 0.780 mg Zn/l (at low pH); 0.33mg Zn/l at neutral/high pH