Registration Dossier
Registration Dossier
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EC number: 252-669-5 | CAS number: 35674-68-1
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Zinc bis[12-hydroxyoctadecanoate]:
Toxicity data are not available for zinc bis[12-hydroxyoctadecanoate]. A 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
Zinc bis[12-hydroxyoctadecanoate]:
As chronic invertebrate toxicity data of zinc bis[12-hydroxyoctadecanoate] are not available, a read-across to insoluble/ slightly soluble zinc substances is made. It is assumed that upon dissolution zinc bis[12-hydroxyoctadecanoate] is changed in part to ionic zinc and that only ionic zinc is determining biological activities. The ecotoxic potential of the fatty acid chain, i.e. 12-hydroxystearate, 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.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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