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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water: screening tests

There was early on evidence that Tert-butyl-4-methoxy-4'-dibenzoylmethane (BMDBM) would not be readily biodegradable under aerobic conditions. Therefore, an anaerobic biodegradation study was conducted, using digested sludge from a municipal wastewater treatment facility. The test result was also negative. The following study on inherent biodegradability revealed that the test item is not biodegradable.


Biodegradation water and sediment: simulation tests

Ultimate degradation in surface water (OECD 309)

The half-life, DT50, of the parent compound in natural water at 12 °C was determined to be 10.8 days at high dose (0.015 mg/L) and 10.2 days at low dose (0.005 mg/L). Under sterile conditions the parent compound degraded slower than in a non-sterile conditions. The half-life at 12 °C was 54.7 days at a concentration of 0.015 mg/L. The parent compound degraded to two major metabolites, depending on the placement of the radiolabel and a common metabolite for both labels.


Biodegradation in sediment (OECD 308)

The half-life, DT50, of the parent compound in freshwater sediment was determined to be 111 days at 12 °C in a river water/sediment system. The half-life in the water phase was 0.13 days at 12 °C and from the entire river water/sediment system the DT50 was determined to be 72.1 days at 12 °C.

Using a pond water/sediment system, the DT50 for the parent compound in the sediment phase was 139 days at 12 °C, for the pond water phase 1.4 days at 12 °C and for the entire pond water/sediment system, the DT50 was 99 days at 12 °C.