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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
Deviations:
no
Principles of method if other than guideline:
None
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
other: HPLC
Test temperature:
None
Details on study design: HPLC method:
EQUIPMENT
- Type, material and dimension of analytical (guard) column: XSelect HSS Cyano, 5 μm (150 x 4.6 mm id)
- Detection system: Ultra-violet (UV)

MOBILE PHASES
- Type: Methanol: [pH 7 (phosphate) buffer solution*] (55:45 v/v)
- Experiments with additives carried out on separate columns: yes
- pH: 7.1


Analytical monitoring:
yes
Details on sampling:
None
Details on matrix:
None
Details on test conditions:
None
Computational methods:
None
Key result
Type:
Koc
Value:
> 17.8 dimensionless
Key result
Type:
log Koc
Value:
> 1.25 dimensionless
Details on results (HPLC method):
None
Adsorption and desorption constants:
None
Recovery of test material:
None
Concentration of test substance at end of adsorption equilibration period:
None
Concentration of test substance at end of desorption equilibration period:
None
Details on results (Batch equilibrium method):
None
Statistics:
None

None

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient of the test material has been determined to be less than 17.8, log10 Koc less than 1.25, using the HPLC screening method.
Executive summary:

The adsorption coefficient of the test material has been determined to be less than 17.8, log10 Koc less than 1.25, using the HPLC screening method, designed to be compatible with Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001. These values indicate that the test item has very high mobility.

Description of key information

The adsorption coefficient of the substance has been determined to be less than 17.8, log10Koc less than 1.25, using the HPLC screening method, designed to be compatible with Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001. These values indicate that the test item has very high mobility.


[LogKoc: 1.25]

Key value for chemical safety assessment

Koc at 20 °C:
17.8

Additional information