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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc (m3/m2), quartz 90% relative humidity:
5.82E-05 at 5 °C
1.77E-01 at 15 °C
3.59E-02 at 25 °C
1.21E-02 at 35 °C
4.05E-03 at 45 °C
1.22E-03 at 55 °C 
ln K HA/air (L/kg) at 98% relative humidity of HA (humic acid):
14.3 at 15 °C
12.9 at 25 °C
12.1 at 35 °C
11.1 at 45 °C
The adsorption and desorption isotherm showed a strong positive monotonic relationship
between log Ce and log X/m, indicated by the correlation coefficients being close to 1.
These values characterise the test substance as slightly mobile (Koc 500-4000) to non-mobile
(Koc>4000) in the four soils and one sediment used in this study.
Mass balance for the four soils and one sediment were in the range 86 to 96%.

Key value for chemical safety assessment

Additional information

For the substance C8-2 FTOH (fluorinated telomer alcohol, CAS No. 678-39-7) adsorption coefficients on quartz as well as logarithmic partition coefficients humic acid-air were determined using the inverse gas chromatography (ICG) method.

Versions for other alcohols (cut + paste):

C4-2 FTOH:

Short description of key information:

Koc (m3/m2), quartz 90% relative humidity:

9.19E-03 at 5 °C

3.82E-03 at 15 °C

1.05E-03 at 25 °C

4.86E-04 at 35 °C

1.84E-04 at 45 °C

8.75E-05 at 55 °C

ln K HA/air (L/kg) at 98% relative humidity of HA (humic acid):

11.3 at 5 °C

10.5 at 15 °C

9.62 at 25 °C

8.69 at 35 °C

7.9 at 45 °C

Discussion:

For the substance C4-2 FTOH (fluorinated telomer alcohol) adsorption coefficients on quartz as well as logarithmic partition coefficients humic acid-air were determined using the inverse gas chromatography (ICG) method.

C6-2 FTOH:

Short description of key information:

Koc (m3/m2), quartz 90% relative humidity:

5.30E-02 at 5 °C

2.17E-02 at 15 °C

6.11E-03 at 25 °C

2.40E-03 at 35 °C

7.73E-04 at 45 °C

3.43E-04 at 55 °C

ln K HA/air (L/kg) at 98% relative humidity of HA (humic acid):

12.4 at 15 °C

11.2 at 25 °C

10.3 at 35 °C

9.41 at 45 °C

Discussion:

For the substance C6-2 FTOH (fluorinated telomer alcohol) adsorption coefficients on quartz as well as logarithmic partition coefficients humic acid-air were determined using the inverse gas chromatography (ICG) method.

C10-2 FTOH:

Short description of key information:

Koc (m3/m2), quartz 90% relative humidity:

1.134 at 15 °C (extrapolated)

2.56E-01 at 25 °C

5.05E-02 at 35 °C

1.59E-02 at 45 °C

4.69E-03 at 55 °C

Discussion:

For the substance C10-2 FTOH (fluorinated telomer alcohol) adsorption coefficients on quartz were determined using the inverse gas chromatography (ICG) method.

Key study regarding OECD Guideline 106:

The adsorption and desorption isotherm showed a strong positive monotonic relationship between log Ce and log X/m, indicated by the correlation coefficients being close to 1. These values characterise the test substance as slightly mobile (Koc 500-4000) to non-mobile (Koc>4000) in the four soils and one sediment used in this study. Mass balance for the four soils and one sediment were in the range 86 to 96%.