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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Referenceopen allclose all

Endpoint:
phototransformation in air
Type of information:
(Q)SAR
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Principles of method if other than guideline:
Calculated with AOP Program v1.92 of EPI-Suite software
GLP compliance:
no
Estimation method (if used):
Sensitiser (for indirect photolysis): OH radicals
Sensitiser concentration: 500,000 molecules/cm³; 24 h/d
Light source:
sunlight
% Degr.:
50
Sampling time:
4 d

Rate constant (for indirect photolysis): 0.0000000000040219 cm³/(molecule*sec)
Degradation in % (for indirect photolysis): 50 after 4 days

Executive summary:

The calculated half-life of diphenyl carbonate in air due to indirect photodegradation is t1/2 = 4.0 days, considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average.

Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
UV- and fluorescence emission spectra
GLP compliance:
no
Light source:
sunlight

Low absorption properties in the UV-B range were observed.

Conclusions:
Due to the low absorption in the UV-B range, no direct photodegradation of diphenyl carbonate is expected.
Executive summary:

Due to the low absorption in the UV-B range, no direct photodegradation of diphenyl carbonate is expected.

Description of key information

The calculated half-life of diphenyl carbonate in air due to indirect photodegradation is 4 days, considering an OH-concentration of 500 000 radicals/cm³ as a 24 h average, EPI-Suite (Currenta, 2008a).

No direct photodegradation of diphenyl carbonate is expected as absorption in the UV-B range is low (Hoyle, 1995).

Key value for chemical safety assessment

Half-life in air:
4 d

Additional information

This endpoint has been addressed with two key studies. Both studies were awarded a reliability score of 2 in accordance with the criteria for assessing data quality as set forth by Klimisch et al. (1997).

 

The first study is a QSAR Estimation for the phototransformation of Diphenyl carbonate in air, calculated with AOP Program v1.92 of EPI-Suite software (Currenta, 2008). The Atmospheric Oxidation Program (AOPWIN) estimates the rate constant for the atmospheric, gas-phase reaction between photochemically produced hydroxyl radicals and organic chemicals. The rate constants are then used to calculate atmospheric half-lives for organic compounds based upon average atmospheric concentrations of hydroxyl radicals and ozone.

The calculated half-life of diphenyl carbonate in air due to indirect photodegradation is t1/2 = 4.0 days, considering an OH-concentration of 500 000 radicals/cm³ as a 24 h average. The rate constant for indirect photolysis was 0.0000000000040219 cm³/(molecule*sec).

 

The second value is taken from a study which investigated UV- and fluorescence emission spectra of the substance (Hoyle et al., 1995). UV-visible adsorption spectra were obtained using a spectrometer and fluorescence spectral measurements.

Low absorption properties in the UV-B range were observed. Therefore no direct photodegradation of diphenyl carbonate is expected.