Registration Dossier
Registration Dossier
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EC number: 300-326-6 | CAS number: 93925-25-8
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Direct photolysis probably not relevant due to rapid indirect photolysis and ozone reaction half-lives calculated by QSPR for representative components (highest value taken), little presence in the atmospheric compartment expected
Key value for chemical safety assessment
- Half-life in air:
- 1.3 h
- Degradation rate constant with OH radicals:
- 0 m³ molecule-1 s-1
Additional information
Experimental data on phototransformation in air are not available for the submission item. As this endpoint is not a standard information requirement in REACH and there is no indication from the Chemical Safety Assessment on the need to investigate further the fate and behaviour of the substance, no further testing is considered necessary. This is, however, a requirement only for the highest tonnage band > 1000 t per year according to the Corrigendum to Regulation (EC) No 1907/2006 of the European parliament and of the council of 18 December 2006 concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), Annex X, 9.3.4., p L 136/118, published 2007-05-29 in the Official Journal of the European Union).
The vapour pressure data indicates that the submission item will not be present in relevant levels in the air. Due to the spectral properties of the submission item, i.e. the little absorption in the spectral range of natural daylight, direct photodegradation is assumed an irrelevant degradation mechanism. Regardless the expected low vaporization, indirect photolysis (reaction with hydroxyl radicals) can be assumed to reduce the presence in air significantly. The calculation with the QSPR software AOP (version 1.92a from the U.S. EPA EPI Suite version 4.10) was performed with two representative structures for high and low molecular weight (MW), assuming a 12-h day, 25 °C and a hydroxyl radical concentration of 1,500,000 OH/cm³. The QSPR calculation revealed half-lives of ca. 0.6 to 1.3 h (and the corresponding degradation rate constants) for the higher and lower MW representatives, respectively, with little difference between cis- and trans-isomers. Similar half-lives were estimated for the ozone reaction (AOP version 1.92) assuming an ozone concentration of 7E11 mol/cm³.
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