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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

In total 12 individual high-quality NOEC/EC10 values (for five different species) are selected for the PNEC derivation, resulting in ecotoxicity reference values ranging from 15.4 mg B/kg dw for Folsomia candida (effect criterion: juvenile reproduction) to 47.5 mg B/kg for Pecilus cupreus (effect criterion: feeding rate).

Data (EC10, NOECs) were generated in single-species toxicity tests with invertebrates, and are based on added nominal values because background concentrations are not always available, and the added risk approach is followed because of the significant difference in bioavailability between boron naturally present in soils and added soluble B.

Key value for chemical safety assessment

Additional information

The identified reliable long-term data for the soil invertebrate species were used for the determination of a PNEC for the terrestrial compartment, using the statistical extrapolation method. All reported effect levels were generated with boric acid as test substance. The reference values for the collemboles F.candida and Onychiurus sp. represent the geometric mean of several tests that assessed reproduction as the effect criterion. 

All other values represent the outcome of an individual study that was conducted with the respective species.

 

All NOEC or EC10 values (including selected, non-selected, unbounded and rejected values) and their corresponding robust study summaries are summarized in Appendix F from the “Boron effects assessment in the terrestrial compartment” report. Further additional information on boron toxicity to the terrestrial compartment can also be found in the Background Document “Environmental effects assessment of boron”, which is attached in the technical dossier in IUCLID Section 13.