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Adsorption / desorption

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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]