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Biodegradation in water and sediment: simulation tests

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In accordance with REACH Annex IX column 2 exemption, the simulation testing in water and sediment does not need to be conducted as Hydrocarbons C11-C16 n-alkanes, isoalkanes, <2% aromatics is considered to be readily biodegradable based upon read-acorss from reliable data available for a number of other Fischer-Tropsch process-derived substances in the relevant carbon number range.

Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics has been tested in an OECD 301F (manometric respirometry) test conducted in compliance with GLP (Vryenhoef, 2014a). The test substance attained 88% biodegradation in 28 days and was therefore considered to be readily biodegradable.

Hydrocarbons, C12-C15, n-alkanes, isoalkanes, <2% aromatics has been tested in an OECD 301F (manometric respirometry) test conducted in compliance with GLP (Vryenhoef, 2014b). The test substance attained 71% biodegradation in 28 days and was therefore considered to be readily biodegradable.

Hydrocarbons, C14-C16, n-alkanes, isoalkanes < 2% aromatics has been tested in an OECD 301F (manometric respirometry) test conducted in compliance with GLP (Best, 2014a). The test substance attained 75% biodegradation in 28 days and was therefore considered to be readily biodegradable.

Hydrocarbons, C15-C19, n-alkanes, isoalkanes <2% aromatics has been tested in an OECD 301F (manometric respirometry) test conducted in compliance with GLP (Best, 2014b). The test substance attained 73% biodegradation in 28 days and was therefore considered to be readily biodegradable.

Since the results of all of the available studies indicated that the substances in this carbon number range were readily biodegradable, it is considered appropriate, based on weight of evidence, to conclude that Hydrocarbons, C11-C16, n-alkanes, isoalkanes, <2% aromatics is readily biodegradable.

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