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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Reference
Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Accepted calculation method
Qualifier:
according to guideline
Guideline:
other: calculated with AOPWIN (v.1.91; US-EPA, 2000)
GLP compliance:
no
DT50:
0.6 d
Test condition:
Sensitiser (for indirect photolysis): OH Sensitiser concentration: 500000 molecule/cm³
Rate constant (for indirect photolysis): = 0.000000000027 cm³/(molecule*sec)
Rate constant (for indirect photolysis): = 0.000000000027 cm³/(molecule*sec)

Description of key information

Phototransformation in air is not relevant due to vapour pressure (< 1 Pa at 20 °C)

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of OPP (CAS No. 90-43-7) are available. Based on a QSAR calculation using AOPWIN v1.92, OPP is susceptible to indirect photodegradation in air (Beiell, 2004). The estimated half-life for the reaction with OH-radicals is 0.6 days (24h day; OH-concentration: 0.5E+06 OH/cm3). However, photodegradation is not expected to be an important environmental fate process since OPP is not expected to evaporate into the atmosphere due to its low vapor pressure of < 1 Pa at 20 °C. As this study is not a standard information requirement in REACh and there is no indication from the Chemical Safety Assessment (CSA) on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary for the test substance.