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EC number: 204-000-3
CAS number: 112-72-1
Estimated rate constant: 21.02050E-12 cm3/molecule.sec
Half-life: 18.3 hours
The half-life is calculated from the rate constant, and assumes an OH radical concentration of 5E+05 OH molecules/cm3) (global average value,
obtained from EU Technical Guidance for environmental risk assessment).
Phototransformation in air (tetradecan-1-ol): Estimated rate constant:
21.021E-12 cm³/molecule.sec (half-life: 18.3 hours) estimated using a
reliable QSAR method (AOPWIN, v1.92).
data are available for tetradecan-1-ol. Tetradecan-1-ol 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.
program (v1.92) has been used to obtain values of the rate constant kOH.
The overall half-life in air under default conditions of hydroxyl
radical concentration was calculated using the following expressions:
= kOH(cm3/molecule.sec) x OH Concair(molecules/cm3)
x 24 x 3600
= ln 2/ kdegair(d-1)
rate constant for degradation in air
rate constant for reaction with hydroxyl radicals
concentration of hydroxyl radicals in air = 5 E+05 OH molecules/ cm3
concentration of hydroxyl radicals in air of 5 E+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, 2016).
of trends in the Category of C6-24 linear and essentially-linear
measurements of atmospheric degradation rate are available for
registration substances, for hexan-1-ol and octan-1-ol. Comparison of
these measured rates with the predicted rates suggests that the
estimated half-lives are realistic and slightly conservative.
data gaps for this endpoint, which is not a REACH requirement but is
helpful in making a realistic assessment of degradation processes in the
environment, the rate of degradation by hydroxyl radicals in the
atmosphere has been based upon estimates made using the SRC AOPWIN v1.92
program (part of the EPIWeb suite v4.01). The nomenclature for the
equivalent substances used in the HPV SIAR and published information is
also included for clarity.
half-life for photo-oxidation in air, based on a hydroxyl radical
concentration of 5E+05 molecules/cm3, varies between 12 hours
(estimated for 1-docosanol) to approximately 30 hours (measured for
branched structures and unsaturated structures are both predicted to be
photodegraded at a faster rate than saturated, linear structures of
equivalent carbon number.
Available measured atmospheric photodegradation data
QSAR estimated photodegradation rate and half-life
Measured photodegradation rate and half-life
Reference for measured data
Half-life: 39.6 hours
12.5 E-12cm3/molecule.secHalf-life: 30.8 hours
Kwok, E.S.C. and Atkinson, R., 1994
12.5 E-12cm3/molecule.sec Half-life: 30.7 hours
14.4 E-12cm3/molecule.secHalf-life: 26.7 hours
Atkinson, R., 1994
R., 1994, Gas-Phase Tropospheric Chemistry of Organic Compounds. J.
Phys. Chem. Ref. Data Monograph No. 2
ECHA (2016). European Chemicals Agency.
Guidance on information requirements and chemical safety assessment
Chapter R.16: Environmental Exposure Estimation. Version: 3.0 February
E.S.C. and Atkinson, R., 1994 cited in the AOPWIN v 1.91 Program
Database (USEPA, 2000) (full original reference not available)
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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