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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Two microbial processes are taken into account for the PNEC derivation for he terrestrial compartment. The ecotoxicity reference values for substrate-induced nitrification and nitrogen transformation are 41.3 mg B/kg soil dw and 48.1 mg B/kg soil dw. 

Key value for chemical safety assessment

Additional information

The selected NOEC/EC10 values from long term microbial are considered reliable (Klimisch score 1 and 2) and relevant for the effects assessment. In total 9 individual high-quality NOEC/EC10 values (for 2 microbial processes) are selected for the PNEC derivation, ranging from 3 mg B/kg for substrate induced nitrification in Zwijnaarde soil (Van Laer et al., 2010) to 419.6 mg B/kg for nitrogen transformation (Förster and Becker, 2009b). All tests were conducted with boric acid as test substance.

Additional information on NOEC or EC10 values from microbial toxicity tests (including selected, non-selected, unbounded and rejected values) are presented as supporting information in the appendix 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.

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