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Diss Factsheets

Ecotoxicological information

Sediment toxicity

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Administrative data

Link to relevant study record(s)

Description of key information

Study conducted on the hydrolysis product of reference substance, boric acid.
The 28d NOEC for Chironomus riparius for mortality and emergence is 180 mg B/kg dw.

Key value for chemical safety assessment

EC50 or LC50 for freshwater sediment:
278 mg/kg sediment dw
EC10, LC10 or NOEC for freshwater sediment:
180 mg/kg sediment dw

Additional information

A Toxicity test with Boric Acid and the midge larva Chironomus riparius using spiked sediment was conducted, according to the OECD draft document ( May 1998).

The exposure duration was 28 days (time needed for emergence of the adults in the control) and the tested substance concentrations were 18, 32, 56, 100, 180 and 320 mg B/kg dry weight of sediment d.w, plus control group.

There were no significant differences between the development rates in the control group, in any of the concentrations, except the emergence ratio at 320 mg B/kg (significantly less).

Statistical testing showed no indication for an effect of the test substance concentration on the male/female ratio.


The 28d LC50 is 278 mg B/k dw (nominal), the 28d LOEC for mortality and emergence is 320 mg B/kg dw and the 28d NOEC for mortality and emergence is 180 mg B/kg dw.