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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study report available

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2007
Report Date:
2007

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Deviations:
no
Qualifier:
according to
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
HPLC estimation method
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

HPLC method

Details on study design: HPLC method:
HPLC CONDITIONS
Instrument: Hewlett Packard 1050 Liquid Chromatograph
Column: Hypersil CPS (25 cm x 4.6 mm internal diameter)
Column temperature: 25°C
Mobile phase composition: Acetonitrile:buffer solution (55:45 v/v), where phosphate and borate buffer solutions were employed for the pH 2.5 and
pH 9 tests respectively.
Flow rate: 1.0 ml/min
Injection volume: 20 µl
Detector: UV set at 210 nm

Results and discussion

Adsorption coefficientopen allclose all
Type:
log Koc
Value:
2.2
Type:
log Koc
Value:
< 1.3
Remarks on result:
other: pH 2.5
Type:
log Koc
Value:
< 1.3
Remarks on result:
other: pH 9

Results: HPLC method

Details on results (HPLC method):
- Retention times of reference substances used for calibration: six reference substances were used to have log10Koc values between 1.3 and 5.6. An internal standard was used to determine the deadline of HPLC system.
- Calibration curve log10 k vs. log10 Koc runs at pH 2.5. The mean calibration curve was used the interpret the results.
- Average retention data for test substance: 4.015 minutes

Results: Batch equilibrium or other method

Transformation products:
no

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
The test substance was found to be have a log10Koc values of 2.2 and less than 1.3 at pH 2.5 and pH 9 respectively