Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability

Trimethylolpropane is hydrolytically stable: The hydrolytic half-life at pH 4.0, 7.0, and 9.0 and 25°C was determined to be greater than 1 year in the dark. Reference: MITI, <= 1994

For the hydrolytical photodegradation a DT50 of 306 days was determined experimentally. Reference:

Reference: MITI, <= 1994

The half life of trimethylolpropane when reacting with OH-radicals in air was calculated to be approx. 28 hours (equivalent to 1.2 days).

Reference: Lanxess, 2009

Biodegradation

Trimethylolpropane was shown to be not readily biodegradable (Reference: Müller & Caspers, 1990), but fulfilled the criterion for inherent, ultimative biodegradability (70% degradability within 7 days) and was 100% inherently biodegradable after 28 days.

Reference: Caspers & Müller, 1992

The performance of a simulation test for ultimate degradation in surface water is scientifically not justified because the substance shows no hazard to humans or the environment and is inherently, ultimate biodegradable.

A sediment and a soil simulation test for biodegradation are not justified due to the low potential to adsorb to the sediment and to the soil and the resulting negligible exposure to sediment and soil.

Bioaccumulation

The bioconcentration potential of trimethylolpropane in fish was tested experimentally. The resulting log BCF of lower than 2, BCF < 17 indicates that the potential for bioconcentration in fish is low.

Reference: MITI, <= 1994

Adsorption/desorption on soil or sediment

The distribution coefficient koc was calculated from a log kow of -0.47 to be 1.5.

Reference: Schweitzer, 2010.

Trimethylolpropane has a low adsorption potential.

Henry´s Constant

The Henrys Law Constant was calculated by using HENRYWIN v3.10. From the values obtained with three different methods, the result from the Bond method was used for any exposure assessment: 1.48 E -08 atm m3/mol. The potential of trimethylolpropane to pass from the water phase into air is very low.

Reference: Lanxess, 2009