1,6-dichlorohexane

Long-term toxicity to aquatic invertebrates

Description of key information

In accordance with column 2 of REACH annex IX, a long-term toxicity to aquatic invertebrates test (required in section 9.1.5) is not necessary as the chemical safety assessment according to Annex I does not indicate the need to investigate further the effects on aquatic organisms. The RCRs were well below 1.
The substance is manufactured and handled in the closed system. Thus, exposure of the aquatic compartment is unlikely.
Furthermore, in the biodegradation test (see section 5.2.1), the substance 1,6-Dichlorohexane is classified as not readily biodegradable in the 10-d-window and after 61 days according to OECD guideline no. 310. However, the biodegradation of the test item came to 54 % after 61 days showing biodegradation with longer exposure times. Thus, long-term exposure of the environment is expected low due to the biodegradation of the substance.
Further long-term testing with daphnia would consequently not improve the risk assessment. Thus, in conclusion, further long-term testing with daphnia is not required.