Registration Dossier
Registration Dossier
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EC number: 209-091-3 | CAS number: 555-32-8
Adsorption / desorption
Administrative data
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03 April 2017 - 18 October 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guidelineopen allclose all
- 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))
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
- Version / remarks:
- 2001
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- HPLC estimation method
- Media:
- soil
Test material
- Reference substance name:
- Aluminium tribenzoate
- EC Number:
- 209-091-3
- EC Name:
- Aluminium tribenzoate
- Cas Number:
- 555-32-8
- Molecular formula:
- C7H6O2.1/3Al
- IUPAC Name:
- aluminium tribenzoate
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Name of test material (as cited in study report): Aluminium tribenzoate
- Appearance: white powder
- Storage conditions: at room temperature
Constituent 1
- Radiolabelling:
- no
Study design
- Test temperature:
- Column temperature: 35°C ± 1°C
HPLC method
- Details on study design: HPLC method:
- PKA CALCULATION
pKa acidic: 4.2 pKa basic: none (Perrin calculation method for the logarithm range of 1 - 14, pKalc 5.0, module in Pallas 3.0, CompuDrug International, USA).
HPLC CONDITIONS
- Apparatus: Acquity UPLC system (Waters, USA)
- Column: Acquity UPLC HSS Cyano, 100 mm x 2.1 mm i.d., dp = 1.8 µm (Waters)
- Injection volume: 5 μL
- Detector: Acquity UPLC TUV (Waters)
- UV detection: 210 nm
MOBILE PHASE
- Since the test item is a salt, the test was performed with no buffer
- Type: unbuffered mobile phase
- Composition: 55/45 (v/v) methanol/water
- Flow: 0.4 mL/min
REFERENCE ITEMS
- Identity: Acetanilide (log Koc = 1.26 according to OECD 121 based on soil absorption data).
- Solution of the reference item was prepared in 55/45 (v/v) methanol/water from a stock solution (ca. 1 g/L) in methanol.
TEST ITEM
- A 10 mg/L test item solution was prepared in 55/45 (v/v) methanol/water from a stock solution (1000 mg/L) in //methanol.
- The stock solution was ultrasonicated for one minute.
DETERMINATION OF RETENTION TIMES
- Duplicate injections of the reference item and test item.
- Single injection of the blank (55/45 (v/v) methanol/water).
Results and discussion
Adsorption coefficientopen allclose all
- Key result
- Type:
- log Koc
- Value:
- < 1.26 dimensionless
- Temp.:
- 20 °C
- Remarks on result:
- other: Unbuffered mobile phase
- Key result
- Type:
- Koc
- Value:
- < 18.2 L/kg
- Temp.:
- 20 °C
- Remarks on result:
- other: Unbuffered mobile phase
Results: HPLC method
- Details on results (HPLC method):
- Mean retention time of the reference item: 0.905 minutes
Mean retention time of the test item: 0.784 minutes
Any other information on results incl. tables
See Illustration for Chromatogram
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Conclusions:
- The log Koc of the substance at neutral pH was estimated to be < 1.26 (Koc < 18.2).
- Executive summary:
The HPLC estimation method based on soil-adsorption reference data was used for the determination of the adsorption coefficient (Koc) of the substance. The study was performed in accordance with EC C.19 and OECD 121 and in compliance with GLP. The unbuffered mobile phase was 55/45 (v/v) methanol/water and the wavelength of detection was 210 nm. The stationary phase contained cyanopropyl chains chemically bonded to silica. One reference item was used: Acetanilide (log Koc 1.26 based on soil-adsorption reference data). Duplicate injections of the reference substance and test item. Mean retention time of the reference item: 0.905 minutes Mean retention time of the test item: 0.784 minutes. From this it was concluded that the log Koc of the substance is < 1.26 (Koc < 18.2).
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