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Environmental fate & pathways

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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.

According to Annex IX 9.2.1.2. Column 2, a study on biodegradation in water and sediment does not need to be conducted as the substance is inherently biodegradable (experimental result please see chapter 5.2.1). Moreover, direct or indirect exposure of sediment is low. Based on the physicochemical properties (log Kow = -2.58), MAPTAC can be expected to have a low potential for adsorption.

 

According to Annex IX 9.2.1.3. Column 2, a study on biodegradation in soil does not need to be conducted since direct or indirect exposure of soil is low. Based on the physicochemical properties (log Kow = -2.58), MAPTAC can be expected to have a low potential for adsorption.