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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

Data for twenty-eight different species are included in the PNEC derivation, and their ecotoxicity reference values range from 7.2 mg B/kg dw for the corn Zea mays (effect criterion: root yield) to 56.0 mg B/kg for the spanisg onion Allium cepa (effect criterion: shoot length). Data are based on added doses (nominal or measured) as 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.

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Additional information

The 192 individual high-quality NOEC/EC10 values that were considered to be reliable/relevant for the derivation of a PNEC for rhe terrestrial compartment range from 3 mg B/kg for barley root elongation in Zwijnaarde soil (Van Laer et al., 2010) to 84.0 mg B/kg for wheat shoot length, canola shoot yield and western wheat grass root yield (Aquaterra, 1998).The identified reliable long-term data for the soil plant 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 (one exception: test with M.sativa, using disodium tetraborate, anhydrous).

 

A large number of papers from the literature were assessed, however only a limited toxicity dataset could be created due to the poor quality of most of the data. References for studies with data on long term single-species toxicity tests resulting in NOEC/EC10 values from hydroponic/sand cultures for higher plants 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.