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Environmental fate & pathways

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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 non volatile, poor soluble in water, solid substance.

The estimated QSARs data on environmental 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 are summarized in table below. Overall, the QSAR estimated data suggest that this substance will not degrade fast in the environment.

 

Table. Degradation rates ofReaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol

 

Degradation rate in water:

Abiotic transformation:

Hydrolysis is not a relevant degradation route for the substance.

 

Biotic transformation:

DT50=37.5 days (900 hours)

Degradation rate in sediment:

DT50=337.5 days (8100 hours)

Degradation rate in soil:

DT50=75 days (1800 hours)

Degradation rate in air:

DT50=0.585 days

 

 

Based on the data summarized in this section of CSR, Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol is not considered to degrade rapidly via abiotic or biotic degradation paths.

There are no experimental data on environmental distribution ofReaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol.

 

Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenolis a solid, poor water soluble substance with low vapour pressure.

 

QSAR modeling predicts that the substance components will volatize slowly from surface water with estimated TD50 = 11 days (river) and 127 days (lake).

 

Once in air,Reaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenol componentswill react with hydroxyl radicals with half-life of 7 hour.

 

The value for soil organic carbon-water partition coefficient (logKoc = 3.81 -4.34) suggests thatReaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenolhas some potential to adsorb onto soil and sediment and, therefore, it is not likely to contaminate groundwater.

 

The data on environmental distribution ofReaction mass of 2,6-di-tert-butyl-p-cresol, 4,6-di-tert-butyl-o-cresol and 2,6-di-tert-butylphenolobtained from the level III fugacity model confirms that this substance does not degrade fast and depending on various emission scenarios, will be in water, soil and sediment.