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Environmental fate & pathways

Phototransformation in air

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Description of key information

Waiver. Not a mandatory REACH requirement

Key value for chemical safety assessment

Additional information

In accordance with Annex X of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals, phototransformation in air is not a mandatory information requirement.

 

Although phototransformation in air is not a mandatory information requirement, calculated data for representative constituents of Alchisor TAL 123: Hydrocarbons C11-C14, n-alkanes, isoalkanes, cyclics, aromatics (2-25%) and undecan-1-ol are available.

Hydrocarbons C11-C14, n-alkanes, isoalkanes, cyclics, aromatics (2-25%)

In the case of Hydrocarbons C11-C14, n-alkanes, isoalkanes, cyclics, aromatics (2-25%), indirect photochemical degradation of these hydrocarbons as mediated by OH-attack, is estimated to have a half-life of 0.09 to 1.43 days, or 1.10 to 17.25 hours, based on a 12-hour sunlight day, a rate of 7.4×10-12to 116.3×10-12cm3/mol/sec, and an average OH-concentration of 1.5×106OH/cm3. A 12-hour day half-life value normalizes degradation to a standard daylight period during which hydroxyl radicals needed for photolysis are generated in the atmosphere.

Undecan-1-ol

The rate constant of photodegradation in air for undecan-1-ol has been estimated using the SRC AOPWIN program. Using this program, undecan-1-ol is estimated to have a half-life of 22.9 hours and a rate constant of 16.78136E-12 cm3/mol/sec assuming an OH radical concentration of 5x105mol/cm3.Branched components, present in the substance within the limits described in section 1.1-1.4, may be photodegraded slightly faster than linear components of equivalent carbon number. The reported half-life therefore represents a reasonably conservative estimate for this substance.

Dodecan-1-ol

Currently no calculated data is available for the Alchisor TAL 123 constituent, dodecan-1-ol.