Registration Dossier
Registration Dossier
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EC number: 231-106-7 | CAS number: 7439-97-6
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Chronic toxicity of inorganic mercury, tested as HgCl2 in freshwater sediment, to Chironomus riparius, was determined during a 28d test. The long-term sediment toxicity study was conducted in the framework of the Eurochlor mercury risk assessment.
Key value for chemical safety assessment
- EC10, LC10 or NOEC for freshwater sediment:
- 930 mg/kg sediment dw
- EC10, LC10 or NOEC for marine water sediment:
- 930 mg/kg sediment dw
Additional information
Sediment data was retrieved from the freshwater data set. A PNEC can be extrapolated by assigning a safety factor to the lowest available chronic NOEC determined in the test.
Thompson et al, 1998
The chronic toxicity of inorganic mercury tested as HgCl2 in sediment toChironomus ripariusin a 28 day test was determined. In this test the time to first emergence, time to 50% emergence and percentage emergence of larvae (< 24h post hatch) after 28 days were tested and gave aNOEC of 1000 mg Hg/kgdry weight (nominal), corresponding to 930 mg Hg/kg dry weight (measured). Toxic effects were only observed at the highest tested concentration (1800 mg/kg dw nominal, corresponding to 1,600 mg/kg dw measured) with only 5% of the larvae emerging as adults, compared with 98% in the control. At this sediment concentration the concentration in the overlying water at the start was approximately 6mg/l of total mercury, while at the end all concentrations were below 1mg/l. This is consistent with the aquatic toxicity data found in literature where long term NOEC’s were found around 1mg/l and shorter term EC50values of higher than 1mg/l. |
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