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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

FATTY ACIDS, C14-18 AND C16-18-UNSATD., ZINC SALTS:
No toxicity data are available for fatty acids, C14-18 and C16-18-unsatd., zinc salts. Read-across to insoluble/ slightly soluble zinc substances is made, and the PNECs water as derived in the Chemical Safety Assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 (see Appendix 1) are carried over to Fatty acids, C14-18 and C16-18-unsatd., zinc salts.
ZINC:
freshwater:
Data on 7 species available. Species NOECs range between 0.044 and 0.530 mg Zn/l (dissolved concentrations)
Marine:
Data on 1 species available. NOEC = 0.025 mg Zn/l (dissolved concentrations)
Species NOECs have been put into the respective species sensitivity distributions.

Key value for chemical safety assessment

Additional information

FATTY ACIDS, C14-18 AND C16-18-UNSATD., ZINC SALTS:

As chronic fish toxicity data are not available for Fatty acids, C14-18 and C16-18-unsatd., zinc salts, a read-across to insoluble/ slightly soluble zinc substances is made. It is assumed that upon dissolution Fatty acids, C14-18 and C16-18-unsatd., zinc salts is changed in part to ionic zinc and that only ionic zinc is determining biological activities. The ecotoxic potential of the fatty acid chain is assumed to be negligible. Fatty acids are generally not considered to represent a risk to the environment, which is reflected in their exclusion from REACH registration requirements (c.f. REACH Annex V (Regulation (EC) No 987/2008)). For a comprehensive overview of the toxicity 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:

Extensive high quality chronic data were available on 7 (freshwater) and 1 (marine) fish species. These data were all screened for relevancy to the environment under study.

The freshwater species are part of 4 families:Cyprinodontidae (Jordanella),Cyprinidae (Phoxinus, Pimephales),Salmonidae (Oncorrhynchus, Salvelinus, Salmo trutta) andCottidae (Cottus). The sensitivity of these species is equally distributed over the species sensitivity distribution. The fish species NOECs are combined with the other freshwater chronic data in the SSD to give the HC5 from which the PNEC is derived.

Species NOECs range between 0.044 and 0.530 mg Zn/l (dissolved concentrations). For O.mykiss, the species mean at pH 8 is 146 µg/l (hardness 45 mg/l, DOC 2 mg/l). Using the corresponding species BLM gives a species NOEC of 146 µg/l at pH 6, which is used as chronic reference value.

The saltwater species comes from the family Clupeidae (Clupea harengus).This species is not among the most sensitive ones in thespecies sensitivity distribution. The fish species NOEC is combined with the other marine chronic data in the SSD to give the HC5 from which the PNEC saltwater is derived.

freshwater:

Species NOECs range between 0.044 and 0.530 mg Zn/l (dissolved concentrations).

Marine:

NOEC = 0.025 mg Zn/l (dissolved concentrations)

Species NOECs have been put into the respective species sensitivity distributions.