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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriate low concentrations.

Key value for chemical safety assessment

Additional information

Sodium 2 -methylpropan-2 -olate hydrolyses in water to form inorganic sodium hydroxide and tert-butanol. For the organic hydrolysis product a toxicity study with activated sludge of a predominantly industrial sewage conducted according to OECD guideline 209 is available (Burlington Research, 1992). In this study an EC50 of > 1000 mg/L (nominal) after 3 hours of exposure was determined. For sodium hydroxide no data are available since the substance completely dissociates in water and effects are related to a shift in pH values only.