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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

One study according to OECD 301B indicates that the 10 % level (beginning of biodegradation) was reached after an adaption phase of 2 days. In the 10-d-window a biodegradation of > 73% was reached. The biodegradation came to a maximum of 89% after 28 days. The test item must be regarded to be readily biodegradable in the 10-d-window.
Under the conditions of a manometric respiratory test (OECD 301F) Methylparaben was found to be readily biodegradable. The BOD attained 92% of ThOD after 28 days.
The test substance methyl 4-hydroxybenzoate is inherently biodegradable according to OECD guideline 302B.
Methylparaben attained 40% of the theoretical gas production in the anaerobic screening test according to the method as described by ISO 11734.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Two studies indicate ready biodegradability. The most reliable and best documented source proves that Methyl 4 -hydroxybezoate

is readily biodegradable and does meet the 10 day window. The latter result was used for the key parameter.