Registration Dossier
Registration Dossier
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EC number: 270-451-8 | CAS number: 68440-34-6
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
FATTY ACIDS, C14 -18 AND C16 -18 -UNSATD., ZINC SALTS:
As 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, and the PNEC soil as derived in the Chemical Safety Assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006 (see Appendix 1) is carried over to Fatty acids, C16-18, zinc salts.
ZINC:
For microbial assays, in total 108 individual high quality NOEC/EC10s represent 4 nitrogen transformation processes, 5 carbon transformation processes and 8 enzymatic processes and range from 17 mg Zn/kg dw for respiration to 2623 mg Zn/kg dw for phosphatase.
Key value for chemical safety assessment
Additional information
As terrestrial toxicity data are not available for Fatty acids, tallow, zinc salts or for the read-across substance Fatty acids, C16 - 18, zinc salts, read-across to inorganic zinc substances is made as a worst case approach in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5.As in the EU Risk Assessment Report (RAR) for zinc stearate, itis 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 data available for zinc is summarized below. For a comprehensive overview of the ecotoxicity of zinc, see the hazard assessment of "Zinc" within the framework of Regulation (EC) No 1907/2006.
ZINC:
For microbial assays, in total 108 individual high quality NOEC/EC10s are selected for the PNEC derivation. These values represent 4 nitrogen transformation processes, 5 carbon transformation processes and 8 enzymatic processes and range from 17 mg Zn/kg dw for respiration (Chang and Broadbent, 1981 and Lighthart et al., 1983) to 2623 mg Zn/kg dw for phosphatase (Doelman and Haanstra, 1989).
Information on the background Zn concentration, allowing correction for differences in bioavailability among soils, is only available for 76 NOEC or EC10 values, representing 13 microbial processes (4 for N cycle, 5 for C cycle and 4 enzymatic processes). The total range in NOEC/EC10 values for the dataset with results for background Zn concentration is the same as for the total dataset for micro-organisms.
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.
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