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Environmental fate & pathways

Other distribution data

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Administrative data

Endpoint:
other distribution data
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Assessment performed according to accepted models

Data source

Reference
Reference Type:
secondary source
Title:
Annex VI. Environmental Distribution Modelling.
Year:
2005
Bibliographic source:
In: Annex VI to the Long Chain Aliphatic Alcohols Category SIAR.

Materials and methods

Principles of method if other than guideline:
Method: other: Mackay Level I and Level III models

Test material

Constituent 1
Chemical structure
Reference substance name:
Icosan-1-ol
EC Number:
211-119-4
EC Name:
Icosan-1-ol
Cas Number:
629-96-9
Molecular formula:
C20H42O
IUPAC Name:
icosan-1-ol

Results and discussion

Any other information on results incl. tables

INPUT DATA USED:
Molecular weight: 298.5
Data temperature: 25 deg C
Log Kow: 7.75
Water Solubility: 0.0011 mg/l
Vapour pressure: 0.000015 Pa
Melting point: 66 deg C
half life in air: 13.1 h
half life in water and soil: 720 h


RESULTS
The % environmental distribution calculated from the above parameters using the MacKay level 1 model is as follows:
Air     1.61E-03%
Soil        97.8%
Water   1.96E-03%
Fish    5.52E-03%
Sediment    2.17%

The Level III program has also been used, with the default model, using the same input parameters. The distribution between compartments obtained is as follows:
Release:       To air   To water   To soil
% in air        0.639   2.52E-05   2.41E-07
% in water      1.22     2.5       0.0111
% in sediment  47.5     97.5       0.433
% in soil      50.6      0.00199  99.6

The results reflect that the ultimate fate of 1-eicosanol is dependent on its route of release into the environment. 1-Eicosanol released to air would partially precipitate to soil and water. There is relatively little movement between
soil and water, because transfer via the air compartment is very slow, for a substance of low volatility. In water, the

adsorption coefficient of 1-eicosanol results in significant adsorption to sediment.

Applicant's summary and conclusion