Registration Dossier

Administrative data

Endpoint:
distribution modelling
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Calculation method using a multimedia fate model based on the fugacity cited in the guidance of the ECHA on information requirements and chemical safety assessment (chapter R16)

Data source

Reference
Reference Type:
other: Fugacity-Based Environmental Equilibrium Partitioning Model
Title:
The fugacity model level I
Author:
Mackay D
Year:
2001
Bibliographic source:
Multimedia Environmental Models: The fugacity Approach 2nd Edition, Lewis Publishers. Boca, Raton, pp: 1-261. [available on line] , URL: http://www.trentu.ca/cemc/

Materials and methods

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Test substance input data:
- Molar mass: 138,12 g/mol
- Data temperature: 25°C
- Water solubility: 2 g/L
- Vapour pressure: 0,0208 Pa
- log Pow: 2
- Melting point: 157°C

Results and discussion

Percent distribution in media

Air (%):
0.03
Water (%):
91.7
Soil (%):
8.1
Sediment (%):
0.2

Any other information on results incl. tables

According to the MacKay model, salicylic acid will distribute as follow:
86.1 % in water
13.6 % in soil
0.3 % in sediment
0.02 % in air
With Log Kow=2.25, water solubility=2g/l, Vp=0.02 Pa, melting point=158°C.

Applicant's summary and conclusion

Executive summary:

According to the Mackay Model Level I, salicylic acid will distribute as follows:

86.1 % in water
13.6 % in soil
0.3 % in sediment
0.02 % in air

This estimation of distribution is consistent with the physico-chimical properties of the substance which show an important water solubility, a low volatility, a non negligible adsorption onto soil and a low Kow.

This calculation method (Mackay, level I) uses a multimedia fate model based on the fugacity cited in the guidance of the ECHA on information requirements and chemical safety assessment (chapter R16), therefore this study is considered as reliable with restrictions.