Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Hydrolysis:

Evaluation ofthe substancecomponents structure shows that it contains no functional groups capable to signifficant dissociation.

 

Phototransformation in air:

Half life of less than 1 day is estimated for reaction of Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components with hydroxyl radicals in the atmosphere at 25oC [AOPWIN Program, v.1.92].

Overall QSARs estimated half-life for degradation ofthe substancecomponents in air based upon AOPWIN Model is 2.6 to 7 hours.

Based on the data on photochemical degradation of Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components in the air, it is considered to degrade in the atmosphere via photooxidation process.

Phototransformation in water:

Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol is a solid substance, which is not soluble in water.The substance components are likely to be absorbed onto particles in water, and this may affect the phototransformation processes in water.Volatilisation of Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components from water and/or biodegradation is not expected to be significant based on volatilisation and biodegradation data forthe substancecomponents.

 

The estimated half-life of Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components in water is 37.5 days (900 hours) using EPI Suite software.

Phototransformation in soil:

Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenolcomponents are likely to be absorbed onto soil particles, and this may affect the phototransformation processes in soil.Volatilisation of the substancecomponents from soil (to a lesser degree) and/or biodegradation is not expected to be significant based on volatilisation and biodegradation data for Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components.

 

The estimated half-life of Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol components in soil is 75 days (1800 hours) using EPI Suite software.