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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Administrative data

Link to relevant study record(s)

phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Migrated phrase: estimated by calculation
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Principles of method if other than guideline:
Calculation using SRC AOP v1.92
GLP compliance:
Estimation method (if used):
- Concentration of OH radicals: 500000 molecules/cm3
- Degradation rate constant: 2.9783E-12 cm3/molecules*s
- Computer programme: SRC AOP v1.92
- Other: assuming a 24-hour day
129 h
Executive summary:

In this study conducted to generally accepted scientific standards the test material (EC 423-340-5) was determined to have a half-life in air of 129 hours

Description of key information

 Study conducted to generally recognised scientific standards

Key value for chemical safety assessment

Half-life in air:
129 h

Additional information

In a SRC AOP v1.92 calculation a degradation rate constant for the indirect photolysis of 2.98E-12 cm3/molecules*s was calculated. Therefore, the test substance has a half-life in air of 129 hours.