Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Phototransformation in air

Currently viewing:

Administrative data

Link to relevant study record(s)

phototransformation in air
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The result was obtained using an appropriate QSAR method
Principles of method if other than guideline:
Calculation based on AOPWIN v1.92, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.11. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
GLP compliance:
Estimation method (if used):
- Concentration of OH radicals: 0.5E+06 radicals/cm3
- Degradation rate constant: 126.7620 E-12 cm3/molecule-sec
- Temperature for which rate constant was calculated: 25 °C
- Computer programme: AOPWIN v1.92
3.038 h
Test condition:
calculation based on a 24 h day

AOP Program (v1.92) Results:



CHEM : 1-Propanamine, 3-(triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-

MOL FOR: C18 H43 N1 O6 Si2

MOL WT : 425.72

------------------- SUMMARY (AOP v1.92): HYDROXYL RADICALS (25 deg C) --------

Hydrogen Abstraction = 63.7620 E-12 cm3/molecule-sec

Reaction with N, S and -OH = 63.0000 E-12 cm3/molecule-sec

Addition to Triple Bonds = 0.0000 E-12 cm3/molecule-sec

Addition to Olefinic Bonds = 0.0000 E-12 cm3/molecule-sec

Addition to Aromatic Rings = 0.0000 E-12 cm3/molecule-sec

Addition to Fused Rings = 0.0000 E-12 cm3/molecule-sec

OVERALL OH Rate Constant = 126.7620 E-12 cm3/molecule-sec

HALF-LIFE = 0.127 Days (24-hr day; 0.5E6 OH/cm3)

HALF-LIFE = 3.038 Hrs

------------------- SUMMARY (AOP v1.91): OZONE REACTION (25 deg C) -----------


(ONLY Olefins and Acetylenes are Estimated)

Experimental Database: NO Structure Matches

Fraction sorbed to airborne particulates (phi):

0.138 (Junge-Pankow, Mackay avg)

0.0617 (Koa method)

Note: the sorbed fraction may be resistant to atmospheric oxidation

The dissipation half-life of 3-(triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine in air was estimated using the AOPWIN subroutine from the EPISuite™ computer program (US EPA), resulting in a half-life of 3.03 hours.

Description of key information

DT50 (parent substance) = 3.04 h

Key value for chemical safety assessment

Additional information

The dissipation half-life of 3-(triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine and its hydrolysis product 3-(trihydroxysilyl)-N-[3-(hydroxysilyl)propyl]-1-propanamine in air was estimated using the AOPWIN subroutine from the EPISuite™ computer program (US EPA), resulting in a half-life of 3.04 and 3.49 hours, respectively (2014). Thus, 3-(triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine and its hydrolysis product 3-(trihydroxysilyl)-N-[3-(hydroxysilyl)propyl]-1-propanamine are susceptible to indirect photodegradation in air. Due to the low vapour pressure and the short chemical lifetime of these substances in air it is not to be expected that the substances will accumulate in air or be transported in the gaseous phase over long distances. Hence, air will not be an environmental compartment of concern.