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Sediment toxicity

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No effect was measured up to a concentration of  1000  mg test item/kg dry sediment. The 28 day NOEC for the emergence rate and development rate was determined to be 1000 mg test item/kg dry sediment, with an associated LOEC of > 1000 mg test item/kg dry sediment. 

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The long term impact of the test item Oil shale, thermal processing waste on the sediment dwelling larvae of the midge Chironomus riparius was evaluated in a in a Sediment-Water System - exposed via spiked sediment according to OECD 218 and GLP. For this purpose, first instar larvae of Chironomus riparius were exposed for 28 days to assess the impact on full maturation of the larvae to adult midges. The larvae were exposed in a sediment-water system containing the test item at various concentrations under defined conditions. Therefore, the sediment was spiked with the test item to simulate the presence of Oil shale, thermal processing waste in the sediment.

The used method of application is recommended by the test guidelines, and also Chironomus riparius is a preferred freshwater aquatic insect species recommended by the test guidelines of the OECD.The influence of Oil shale, thermal processing waste on the survival and development of Chironomus riparius was determined during an exposure period of 28 days. The 28 day NOEC for the emergence rate was determined to be 1000 mg test item/kg dry sediment, with an associated LOEC of > 1000 mg test item/kg dry sediment. The NOEC for the development rate was determined to be 1000 mg test item/kg dry sediment, with an associated LOEC of > 1000 mg test item/kg dry sediment. The EC50 for the emergence rate was calculated to be > 1000 mg test item/kg dry sediment and > 1000 mg test item/kg dry sediment for development rate.