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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

MAPTAC is inherently biodegradable (OECD Guideline 301 F/EU Method C.4-D; Manometric Respirometry Test).

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

One study on biodegradation of MAPTAC is available, which is considered as reliable without restrictions (Klimisch score 1):

The biodegradation of MAPTAC was investigated in a study conducted according to OECD Guideline 301 F, adopted 17th July 1992 (Ready Biodegradability: Manometric Respirometry Test) and EU Method C.4-D, 30 May 2008 over a period of 56 days using activated sludge sampled from the aeration tank of a municipal sewage treatment plant as inoculum. The biodegradation rate was determined by measurement of O2 consumption. Inoculum blank and procedural/functional control with the reference substance sodium benzoate were performed.

The functional control reached the pass level >60% after 14 d.

MAPTAC did not reach the pass level of 60% for ready biodegradability within the 10-d window as well as after 28 days of incubation and, therefore, cannot be termed as readily biodegradable. According to the “Revised introduction to the OECD guidelines for testing of chemicals, section 3” the test substance can be termed as inherently biodegradable, since a biodegradation of more than 70% was reached in all 4 replicates within 56 days.