Decanol, branched and linear

Endpoint summary

Additional information

Short-term toxicity

A reliable 72 h EC50 value of 98 mg/kg dw soil (1.3% organic carbon) has been determined for the effects of decanol (CAS 112 -30 -1) on population numbers of the nematode Caenorhabditis elegans. The study reflects the lowest value that is available for this endpoint and has been chosen as key.

Other studies conducted in soil (1.3 % organic carbon) show 6 -7 day EC50 values in the range 120-320 mg/kg dw with macroorganisms.

A 72 h EC₅₀value of 320 mg/kg dw soil has been determined for the effects of the test substance on population numbers of the sediment dwelling arthropod Fulsomia candida.

Decanol branched and linear contains linear decanols and branched decanols (a single methyl branch group in the 2-position).

Where no data is available for decanol branched and linear (CAS 90342-32-8) and a study report is available with the closely related substance decanol (CAS 112-30-1), it will be possible to directly read-across the results. Decanol branched and linear (CAS 90342-32-8) has a type of branched structure termed 'essentially linear' and the physicochemical, toxicological and ecotoxicological properties and behaviour do not differ significantly between such structures and their linear analogues. Additionally the two substances have identical molecular weights. It is therefore possible to read-across between the two substances. The difference in composition is dependent on the manufacturing process which may create linear alcohols or simple mono-branched structures. Direct read-across from decanol (CAS 112-30-1) to decanol branched and linear (CAS 90342-32-8) is therefore scientifically justified.

Toxicity to micro-organisms

In accordance with Column 2 of REACH Annex IX, the toxicity test with terrestrial microorganisms (required in Section 9.4.2) does not need to be conducted as direct and indirect exposure of the soil compartment is unlikely. In the absence of toxicity data for soil organisms, the equilibrium partitioning method has been applied to assess the hazard to soil organisms.

Moreover, considerable technical difficulties would be expected in the conduct of such a test, due to the very rapid biotic removal of the substance from the test system (based on experience in the long-term aquatic invertebrate study).

Long-term toxicity

In accordance with Column 2 of REACH Annex X, long-term toxicity testing with terrestrial organisms (required in Section 9.4) is not needed as the chemical safety assessment according to Annex I indicates that this is not necessary.

Moreover, considerable technical difficulties would be expected in the conduct of such a test, due to the very rapid biotic removal of the substance from the test system (based on experience in the long-term aquatic invertebrate study).

Toxicity to terrestrial plants

In accordance with Column 2 of REACH Annex X, long-term toxicity testing with terrestrial plants (required in Section 9.4.5) is not needed as the chemical safety assessment according to Annex I indicates that this is not necessary.

Moreover, considerable technical difficulties would be expected in the conduct of such a test, due to the very rapid biotic removal of the substance from the test system (based on experience in the long-term aquatic invertebrate study).

Toxicity to birds

In accordance with Column 2 of REACH Annex X, long-term and reproductive toxicity testing with birds (required in Section 9.6) is not needed as the chemical safety assessment according to Annex I indicates that this is not necessary.

Testing for toxicity to terrestrial organisms is not considered necessary because:

- PNECsoil has been calculated from PNECfreshwater on the basis of the equilibrium partitioning method; the risk characterisation ratio (RCR) based on PNECsoil is <1