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EC number: 807-130-4
CAS number: 53716-82-8
constant for reaction with OH radicals:
(submission substance): 2.5E-11 cm3/molecule.sec (half-life
Diol: 3.9E-11 cm3/molecule.sec (half-life 0.4 days)
measured phototransformation in air data are available for the
substance contains no chromophores that would absorb visible or UV
radiation, so direct photolysis is not likely to be significant.
Indirect photolysis resulting from gas-phase reaction with
photochemically-produced hydroxyl radicals may occur.
AOPWIN program (v1.92, EPA 2010) has been used to obtain values of the
rate constant kOH for reaction of the submission
substance with hydroxyl radicals.
overall half-life in air under default conditions of hydroxyl radical
concentration was calculated using the following expressions:
(d-1) = kOH (cm3/molecule.sec) x
OH Concair (molecules/cm3) x 24 x 3600
(d) = ln 2/ kdegair (d-1)
rate constant for degradation in air
rate constant for reaction with hydroxyl radicals
concentration of hydroxyl radicals in air = 5E+05 OH molecules/ cm3
concentration of hydroxyl radicals in air of 5E+05 OH
molecules/cm3, and the 24 hour photoperiod, are the values
specified in ECHA Guidance on Information requirements and chemical
safety assessment, Part R.16 Environmental exposure estimation (ECHA,
results are given in the table below:
Table 4.1.1: Results of
photodegradation in air calculations
Result (Gem Diol)
kOH (cm3/ molecule.sec)
EPA, 2010. US Environmental
Protection Agency. AOPWIN
program v1.92a (September, 2010)
ECHA (2016). REACH Guidance on
Information Requirements and Chemical Safety Assessment Chapter R16:
Environmental Exposure Assessment Version: 3.0. February 2016.
R.16-3.2.2 Photochemical reactions in the atmosphere
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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