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Sediment toxicity

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Description of key information

The No Observed Effect Concentration after 28 days was 1000 mg/kg. The No Observed Effect Concentration was based on no significant reduction in emergence.

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Additional information

One study is available to assess the toxicity of the test item to the sediment-dwelling larvae of Chironomus riparius. The method followed recommendations of the OECD Guidelines for Testing of Chemicals No. 218 (revised draft document December 2002) “Sediment-Water Chironomid Toxicity Test using Spiked Sediment” (Sacker, 2014).

Following a preliminary range-finding test 80 larvae of Chironomus riparius were exposed in groups of 20 (four replicates of 20 larvae per concentration) to formulated sediment spiked with test item over a range of concentrations of 63, 125, 250, 500 and 1000 mg/kg for a period of 28 days. The numbers of emerged adult midges were recorded daily. A further 20 larvae (one replicate of 20 larvae) of each test group were prepared and sacrificed on Day 10 of the exposure period to determine the 10-Day larval survival and growth data. Inspection of the data showed no significant differences in larval survival and growth, in terms of mean larval dry weight, between the control and each test group after 10 days.

The toxicity of the test item to the sediment-dwelling larvae of Chironomus riparius gave a 28-Day EC50 (emergence) of greater than 1000 mg/kg. The No Observed Effect Concentration was 1000 mg/kg. The EC50 (development rate) based on nominal test concentrations was greater than 1000 mg/kg.