Registration Dossier

Ecotoxicological information

Long-term toxicity to aquatic invertebrates

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

FATTY ACIDS, C14-18 AND C16-18-UNSATD., ZINC SALTS: 
Toxicity data are not available for Fatty acids, C14-18 and C16-18-unsatd., zinc salts. Read-across to insoluble/ slightly soluble zinc substances is made.
ZINC:
freshwater:
Data on 13 species available. Species NOECs range between 0.037 and 0.400 mg Zn/l (dissolved concentrations)
Marine:
Data on 26 species available. Species NOECs range between 0.0056 and 0.9 mg Zn/l (dissolved concentrations)
Species NOECs have been put into their respective species sensitivity distributions.

Key value for chemical safety assessment

Additional information

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

As chronic invertebrate 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 substance 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 13 different freshwater invertebrate species and 26 marine invertebrate species. These data were all screened for relevancy to the environment under study.

The freshwater species are part of several different taxonomic groups: poriferans (4 species), molluscs (2 species), crustaceans (4 species), rotifers (2 species) and insects (1 species). The sensitivity of these species is equally distributed over the species sensitivity distribution.

The marine species are part of several different taxonomic groups: annelids (4 species), cniderians (1 species), crustaceans (6 species), echinoderms (5 species), molluscs (9 species) and nematods (1 species) .The sensitivity of these species is equally distributed over the species sensitivity distribution.

The invertebrate species NOECs are combined with the other freshwater and marine chronic data in the SSD to give the HC5 from which the respective PNECs are derived.

Species freshwater NOECs range between 0.037 and 0.400 mg Zn/l (dissolved concentrations). The Daphnia magna-BLM predicts at pH6 (other water conditions same) a species NOEC of 82 μg which is used as chronic reference value.