Registration Dossier

Administrative data

Endpoint:
other distribution data
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Assessment performed according to accepted models and principles.

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

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Any other information on results incl. tables

INPUT DATA USED:
Molecular weight 172.3
Data temperature 25 deg C
Log Kow 4.72
Water Solubility 8 mg/l
Vapour pressure 0.39 Pa
Melting point 14 deg C
half life in air 22.9 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         3.37%
Soil        92.5%
Water       1.99%
Fish    5.22E-03%
Sediment    2.06%

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       77.9      0.0414    0.000334
% in water      2.67    36.6       0.0458
% in sediment   4.64    63.4       0.0794
% in soil              14.8      0.00784  99.9

The results reflect that the ultimate fate of 1-undecanol is dependent on its route of release into the environment. 1-Undecanol 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-undecanol results in significant adsorption to sediment.

Applicant's summary and conclusion