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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The test substance demonstrated high tendency to adsorb to the three test soils. In a worst case scenario, the average Koc value of 222000 cm3/g has been taken forward for the purpose of risk assessment. The average log Koc was calculated to be 5. Therefore on the basis of these results, the test substance was considered to be hardly mobile in soil. 

Key value for chemical safety assessment

Koc at 20 °C:
222 000

Additional information

An adsorption and desorption test for C12-14 alkylmorpholine has been performed according to the OECD Guideline 106 in compliance with GLP. Equilibration time, percentage adsorption, adsorption parameters Kd and Koc as well as the desorption percentage and the parameter Kdes was determined in three soils. The components of the test substance showing two main peaks were treated as representative for the test substance, C12 alkylmorpholine and C14 alkylmorpholine. A summary of the results is presented below. Summary adsorption and desorption parameters of 3 tested soils, C12 alkylmorpholine:

Soil type

Adsorption

%

Kd

cm3/g

Koc

cm3/g

Log Koc

Desorption

%

Kdes

cm3/g

LUFA 2.2

77.4

3.4E+02

1.8E+04

4.2

<2.6

<3.8E+03

LUFA 6S

94.2

1.7E+03

1.0E+05

5.0

1.3

1.1E+04

Eurosoil 4

87.1

7.1E+02

5.5E+04

4.7

<0.4

<2.8E+04

 

Summary adsorption and desorption parameters of 3tested soils, C14 alkylmorpholine

Soil type

Adsorption

%

Kd

cm3/g

Koc

cm3/g

Log Koc

Desorption

%

Kdes

cm3/g

LUFA 2.2

90.4

9.5E+02

4.9E+04

4.7

<0.1

<7.4E+04

LUFA 6S

99.1

1.1E+04

6.8E+05

5.8

0.3

5.3E+04

Eurosoil 4

98.1

5.6E+03

4.3E+05

5.6

<0.1

<8.5E+04

 

For all soils tested the adsorption percentages were calculated to be very high. These results and the observed adsorption parameters Kd and Koc values showed that the test substance adsorbed strongly to the soils tested. The values for desorption percentage and Kdes were observed to be very low.

[LogKoc: 5.0]