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Toxicity to microorganisms

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There is no toxicity test on microorganisms for "Reaction products of 3-methylbutanal and 3-methylbut-3-en-1-ol, distillation overheads, acid-treated, hydrogenated" available. Thus, the hazard assessment is based on the main components of the Reaction product 2H-pyran-4-ol (CAS 63500 -71 -0). There is one guideline study on the toxicity of 2H-pyran-4-ol to activated sludge available. A potential respiration inhibition induced in activated sludge by the substance was tested in compliance with OECD guideline 209. An EC50 >1000 mg/L was determined after 180 minutes of incubation (Firmenich, 2007).