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Sediment toxicity

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Description of key information

In accordance to Regulation (EC) No. 1907/2006, Annex X, Column 2, 9.5.1, as the RCR sediment is < 1 no further effects of methylcyclohexane on sediment organisms need to be investigated and a long-term test is therefore not required.

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In accordance with Regulation (EC) No 1907/2006, Column 2 of Annex X, section 9.5.1 long-term toxicity tests on sediment organisms does not need to be investigated if the outcome of the chemical safety assessment shows no indication of risk on sediment organisms from exposure to the substance in question. In a first step, the sediment PNEC for methylcyclohexane has been derived using aquatic PNECs and the equilibrium partitioning method (EqP). The risk characterization ratio (RCR) has demonstrated that there is no indication of risk i.e. PEC/PNEC sediment < 1 from current exposure conditions to methylcyclohexane.

Furthermore, considering the high volatility, the substance is expected to be rapidly removed within sewage treatment plants/ environment. As a consequence, chronic exposure of sediment organisms is unlikely to occur. In addition, due to the high volatility, it is unlikely that a constant exposure concentration could be achieved in sediment toxicity tests.

In conclusion, in accordance to Regulation (EC) No. 1907/2006, Annex X, Column 2, 9.5.1, as the RCR sediment is < 1 no further effects of methylcyclohexane on sediment organisms need to be investigated and a long-term test is therefore not required.