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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-03-24 until 2009-08-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
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))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
The Analysis Department of the Groupement de Recherches de Lacq was recognised as compliant with the GLPs issued by the Groupement lnterministeriel des Produits Chimiques (GIPC) on 27 November 2007.
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
No test surrogate or analogue material.
Radiolabelling:
no
Test temperature:
22 ± 0.5 °C
Details on study design: HPLC method:
EQUIPMENT
- Apparatus: A mass spectrometer fitted with a time of fly analyzer and a UV spectrometer were placed in series.
- Type: HP Autosampler, HP 1100 LC Pump, LCT Premier Mass Spectrometer, HP 1 100 UV Detector, Mettler Balance AG 245
- Type, material and dimension of analytical (guard) column:
Column:
Column: Agilent Zorbax CN Length 15 cm
Particle size (µm) 5
Internal diameter 2.1 mm
Injected volume (µL) 5.0
Flow rate of mobile phase (ml/min) 0.25
Wavelength analysis (nm) 210
- Detection system: mass spectrometer, UV


MOBILE PHASES
- Type: Methanol-water 55/45 v/v
- Experiments with additives carried out on separate columns: no
- pH: no data
- Solutes for dissolving test and reference substances:
A quantity of about 75 mg of 10-UNDENECENOIC ACID was accurately weighed (to the nearest 0.1 mg) and dissolved with 50 mL of methanol.
Preparation of the analytical reference items solufions
A quantity of about 48 mg of 1,1-bis(4-chlorophenyl)-2,2,2-tricfiloroethane was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 10 mg of phenanthrene was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 4 mg of naphtalene was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 34 mg of triadimenol was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 47 mg of methyl benzoate was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 30 mg of acetanilid was accurately weighed into a 50 mL volumetric flask. The volume was made with methanol.
A quantity of about 316mg of formamid was accurately weighed into a 50 m l volumetric flask. The volume was made with methanol.

DETERMINATION OF DEAD TIME
- Method: by inert substances which are not retained by the column
The dead time is measured by use of formamide, which is not retained on the column.

REFERENCE SUBSTANCES
- Identity: 1,1-bis(4-chlorophenyl)-2,2,2-tricfiloroethane, phenanthrene, naphtalene, triadimenol, methyl benzoate, acetanilid, formamid


DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: 7.5 µg
- Quantity of reference substances:
1,1-bis(4-chlorophenyl)-2,2,2-tricfiloroethane: 4.8 µg
phenanthrene: 1.0 µg
naphtalene: 0.4 µg
triadimenol: 3.4 µg
methyl benzoate: 4.7 µg
acetanilid: 3.0 µg
formamid: 31.6 µg
- Intervals of calibration: no data


REPETITIONS
- Number of determinations: 3


EVALUATION
- Calculation of capacity factors k': k' = (tr - to) / to
- Calculation of retention times: arithmetic mean of three test runs
- Determination of the log Koc value:
Regression equation: A correlation of log k' versus log K, is plotted for the appropriate reference substances. The regression equation is performed at regular intervals, so that account can be taken of possible changes in column performance. At least two determinations are performed and the value retained for log Kocof the test item is the mean of the two values obtained.
Computational methods:
No data.
Key result
Type:
Koc
Value:
691.83
Key result
Type:
log Koc
Value:
2.84
Details on results (HPLC method):
- Retention times of reference substances used for calibration: in min
1,1-bis(4-chlorophenyl)-2,2,2-tricfiloroethane: 24.2
phenanthrene: 10.19
naphtalene: 5.41
triadimenol: 4.37
methyl benzoate: 3.4
acetanilid: 2.77
formamid: 2.09
- Details of fitted regression line (log k' vs. log Koc): log Koc = 2.868 log k' + 2.415 (r2 = 0.9839)
- Graph of regression line attached: no
- Average retention data for test substance:
Injection 1: 5.00 min
Injection 2: 4.99 min
Injection 3: 4.99 min
Transformation products:
not measured
Statistics:
No statistics applied.

No remark.

Validity criteria fulfilled:
yes
Remarks:
The temperature during the measurement did not vary by more than ± 1 °C. Repeatability and reproducibility validity criteria fulfilled.
Conclusions:
At the test conditions (HPLC), the adsorption coefficient of 10-UNDENECENOIC AClD was found to be log Koc = 2.84. Therefore test item can be considered as a less adsorptive substance.
Executive summary:

The objective of this study was to determine the Adsorption Coefficient of the test item 10- UNDENECENOIC AClD applying the procedure described in the OECD Guideline 121 Adsorption Coefficient on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC). At the test conditions (HPLC), the adsorption coefficient of 10-UNDENECENOIC AClD was found to be log Koc = 2.84 (Koc = 691.83). This result is close to the log Koc 2.77 of reference substance acetanilide, which represents the lower end of adsorption values of the reference substances used. Therefore, the adsorption potential of the test item is considered low. 

Description of key information

Under the conditions of the available study (HPLC method – OECD Test Guideline 121), the adsorption coefficient was found to be log Koc = 2.84 (Koc 691.83). Therefore, the adsorption potential of the test item is considered low. 

Key value for chemical safety assessment

Koc at 20 °C:
692

Additional information

[LogKoc: 2.84]