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Environmental fate & pathways

Phototransformation in air

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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:
supporting study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Accepted calculation method
according to guideline
other: calculated with AOPWIN (v.1.91; US-EPA, 2000)
GLP compliance:
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.