Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

In contact with water, tert-butyl acrylate will hydrolyze slowly. Photodegradation in air will proceed rapidly (half life <2 days). Tert-butyl acrylate was not readily biodegradable in a OECD 310-Screening test. After 28 days a biodegradation degree of 50 - 60 % was determined. The 10-day-window criterion for ready biodegradability was not fulfilled. Based on these data, tert-butyl acrylate is considered to be partly or moderately biodegradable.

Degradation products expected for tert-butyl acrylate are acrylic acid and tert-butanol. Acrylic acid is readily biodegradable according to OECD criteria. The biodegradability of tert-butanol was investigated in a CO2-Headspace test according to ISO 14593 (non-GLP). After 28 days a biodegradation degree of 70 - 80 % was reached (BASF AG 1997). Tert-butanol was considered to be biodegradable. Taking all these data into consideration, tert-butyl acrylate can be expected to be (inherently) biodegradable in the environment. Formation of persistent breakdown products is not expected.

Based on an experimental log Kow and calculated BCF, a potential for bioaccumulation is not to be expected. Adsorption of tert-butyl acrylate to the solid soil phase is not expected.

Fugacity model calculation (Mackay Level I) revealed the atmosphere as the main target compartment for distribution which is also indicated by the substance's physicochemical properties.

All available relevant environmental fate data is tabulated below.

Physchem property

Key value for assessment

Comments

Phototransformation in air

Half-life = ca. 39.7 hours

AOPWIN calculation

Hydrolysis

Half-life = 23.6 years

HYDROWIN calculation

Biodegradation

Not readily biodegradable

OECD TG 310

Adsorption / desorption

Koc = 138.9 / 23.14 L/kg (log Koc = 2.1428 / 1.3643 ) 

KOCWIN calculation (log Kow / MCI method)

Henry’s Law Constant

HLC = 21.9 Pa·m³/mole 

HENRYWIN calculation (Bond method)

Environmental distribution

Air: 97.8%; water: 2.1%

MacKay Level I calculation

Additional information