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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

Relevant and reliable chronic reference values (NOEC/EC10) that could be used for risk assessment purposes (PNEC) were identified for four different species, representing crustaceans, insects and rotifers. The values shown here represent ‘added’ concentration levels and may therefore deviate slightly from values reported elsewhere. No-effect levels range between 6.3 mg B/L and 24.6 mg B/L, with the amphipod H.azteca being the most sensitive invertebrate species.

  • Daphnia magna: 13.9 mg B/L (end criterion: reproduction)
  • Hyalella azteca: 6.3 mg B/L (effect criterion: reproduction)
  • Chironomus riparius: 20.1 mg B/L (effect criterion: emergence)
  • Brachionus calyciflorus: 24.6 mg B/L (effect criterion: growth)
  • Lampsilis siliquoidea: 30 mg B/L (effect criterion: biomass shell length)

 No reliable long-term studies with marine invertebrates were identified in scientific literature.

Key value for chemical safety assessment

Additional information

The identified reliable long-term data for invertebrate species were used for the determination of a PNEC for the freshwater environment, using the statistical extrapolation method. All reported effect levels were generated with boric acid as test substance, and test concentrations in the test media were verified. The reference value for the cladoceran D.magna represents the geometric mean of several studies that assessed reproduction as effect criterion. 

All other values represent the outcome of individual studies that were conducted with the respective species.


Additional information on the different long-term studies with invertebrates can be found in the Tables and in the Background Document “Environmental effects assessment of boron”, which is attached in the technical dossier in IUCLID Section 13..