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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

FATTY ACIDS, C14-18 AND C16-18-UNSATD., ZINC SALTS: 
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:
37 NOEC or EC10 values on soil macroorganisms are available covering 6 different worm species and vary from 35.7 mg Zn/kg for Enchytraeus albidus to 1634 mg Zn/kg dw for Lumbricus terrestris

Key value for chemical safety assessment

Additional information

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

As no terrestrial toxicity data are available for Fatty acids, C14-C18 and C16-18-unsatd., zinc salts, 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:

37 NOEC or EC10 values cover 6 different worm species and vary from 35.7 mg Zn/kg for Enchytraeus albidus (Lock and Janssen, 2001c) to 1634 mg Zn/kg dw for Lumbricus terrestris (Spurgeon et al., 2000).

All toxicity data are expressed as added Zn concentration in soil, based on either the nominal dose added or on measured, background corrected soil Zn concentrations.

[Lock K. & Janssen C. R. (2001). Modeling zinc toxicity for terrestrial invertebrates. Environmental Toxicology and Chemistr y, Vol. 20, No. 9, pp. 1901–1908, 2001]

[Spurgeon D. J. et al (2000). Relative sensitivity of life-cycle and biomarker responses in four earthworm species

exposed to zinc. Environmental Toxicology and Chemistr y, Vol. 19, No. 7, pp. 1800 –1808, 2000]