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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Description of key information

FATTY ACIDS, C14-18 AND C16-18-UNSATD., ZINC SALTS: 
Freshwater plant toxicity data are not available for Fatty acids, C14–C18 and C16-18-unsatd., zinc salts. Read across to insoluble/ slightly soluble zinc substances is made.
ZINC:
chronic NOEC for one multicellular algae species available (0.06mg Zn/l).
Additional supportive information on 4 higher aquatic plant species available; chronic NOEC >650µg Zn/l on all 4 species tested.

Key value for chemical safety assessment

Additional information

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

As no data for toxicity of Fatty acids, C14-C18 and C16-18-unsatd., zinc salts on freshwater plants is available, a read-across to insoluble/ slightly soluble zinc substancesis 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:

The EU risk assessment on zinc (ECB 2008) used one chronic NOEC on Cladophora glomerata in the PNEC database. Additional information on long term experiments on 4 higher aquatic plant species was used as supportive evidence, demonstrating the low sensitivity of this taxonomic group.

chronic NOEC for one multicellular algae species available (0.06mg Zn/l).

Additional supportive information on 4 higher aquatic plant species available; chronic NOEC >650μg Zn/l on all 4 species tested.