Registration Dossier
Registration Dossier
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EC number: 283-406-2 | CAS number: 84625-32-1 Extractives and their physically modified derivatives such as tinctures, concretes, absolutes, essential oils, oleoresins, terpenes, terpene-free fractions, distillates, residues, etc., obtained from Eucalyptus globulus, Myrtaceae.
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Koc values of Eucalyptus oil vary between 260.4 L/kg and 3222.3 L/kg.
Key value for chemical safety assessment
- Koc at 20 °C:
- 3 222.28
Additional information
Eucalyptus oil is a natural complex substance. It is a mixture of several components, but three of them represent 90% of that mixture. Log Kow of each of these components were determined and Koc values for Eucalyptus oil were calculated for the two extreme Log Kow values: 1,8-cineol with a log Kow at 2.84 and alpha-pinene with a log Kow at 4.42.
In a weight of evidence approach, 1,8-cineol and alpha-pinene Koc values were calculated with 3 different methods (table 1, table 2):
Table 1. Calculation approaches for Koc values of 1,8-cineol
cineol 1,8 |
||
log Koc |
Koc |
|
TGD, non hydrophobic |
2,4968 |
313,91 |
MCl |
2,3448 |
221,2 |
logP (2,84) |
2,4968 |
254,3 |
geo. mean |
2,44 |
260,40 |
Table 2. Calculation approaches for Koc values of alpha-pinene
alpha pinene |
||
log Koc |
Koc |
|
TGD, Predominantly hydrophobic |
3,6802 |
4788,5056 |
MCl |
3,0087 |
1020 |
logP(4,42) |
3,8357 |
6850 |
geo. mean |
3,49 |
3222,28 |
Regarding the wide range of Koc values, it is not possible to determine only one Koc value to characterise Eucalyptus oil Adsorption behaviour. Therefore it is assumed that both values of Koc should be considered for the Risk Assessment.
[LogKoc: 3.49]
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