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Biodegradation in water: screening tests:

Normal paraffins in the C9 to C14 Aliphatics category (<2% aromatics) are readily biodegradable, exhibiting 77 to 83% biodegradation in 28 days based on oxygen consumption and meeting the 10-day window.

Moreover, "Hydrocarbons, C14-C20, aliphatics (≤2% aromatics)" were found to be readily biodegradable (biodegradation > 60% ThOD) in an OECD 306 ready biodegradability test.

Therefore, the substance Paraffins (petroleum), normal C>10 is considered readily biodegradable and no further biodegradation studies are deemed necessary.