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Short-term toxicity

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.

Reliable short-term toxicity tests results are available for freshwater fish (Pimephales promelas) and invertebrates (Nitocria spinipes). LC50values for the two organisms are 2.4 and 3.1 mg/L respectively. A reliable EC50value in the range of 1-10 mg/L has been estimated by read-across from other taxonomic levels (Fisk et al. 2009). A long-term NOEC of 100 µg/L has been determined for reproduction of Daphnia magna.

At these concentrations decanol is expected to be fully dissolved.

In waste-water treatment plant micro-organisms, 1-decanol does not cause inhibition at the limit of water solubility. In view of the ready biodegradability, further information is not required in REACH.

A 6 d EC50 value of 150 mg/kg dw soil (1.3% organic carbon) has been determined for the effects of decanol on population numbers and survival of the ostracod H. incongruens.

Long-term toxicity

Long term toxicity data is available for one of the most sensitive taxonomic groups, (21 d) 100 ug/L NOEC determined on reproduction of D. magna.

With regards to the other long term aquatic toxicity tests (fish and sediment):

In accordance with Column 2 of REACH Annex X, long-term toxicity testing with aquatic organisms (required in Sections 9.1.6 and 9.5.1) are not needed as the chemical safety assessment according to Annex I indicates that these are 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).