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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:
2008-12-10 to 2008-12-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
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
GLP compliance:
yes (incl. certificate)
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Specific details on test material used for the study:
- Name of test material (as cited in study report): Dibenzyltoluene (Dibenzylbenzene, ar-methyl derivative)
- Substance type: product
- Physical state: liquid
- Lot/batch No.: 0845
- Expiration date of the lot/batch: 2009-10-08 at the earliest
- Storage condition of test material: in a closed vessel at room temperature (20 ± 5°C)
- Other:
Production date: 2008-10-08
Appearance: colourless to yellow, clear liquid
Test temperature:
Room temperature, 22 ± 1 °C
Details on study design: HPLC method:
EQUIPMENT
- Type, material and dimension of analytical (guard) column: Reprosil-Pur CN Dr. Maisch, 4.6 mm i.D., 100mm length, perticle size 3 µm
- Detection system: Dionex, UVD 170S; Wavelength for evaluation: 210 nm


MOBILE PHASES
- Type: Mixture of 55% methanol and 45% water, both HPLC-grade, isocratic
- pH: 6.92
- Solutes for dissolving test and reference substances: The test item was dissolved and diluted in the eluent.


DETERMINATION OF DEAD TIME
- Method: by inert substances which are not retained by the column
- inert substance: Sodium nitrate


REFERENCE SUBSTANCES
- Identity: see table below


DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: see table below
- Quantity of reference substances: see table below
- Intervals of calibration: each three times before and after the measurements of the test item


REPETITIONS
- Number of determinations: 6 repetitions for reference substances, 3 repetitions for test item


EVALUATION
- Calculation of capacity factors k': see below
- Calculation of retention times:
- Determination of the log Koc value:
Key result
Type:
log Koc
Value:
>= 3.548 - <= 5.578 dimensionless

 Peak  Mean retention time [min]  Log Koc ± sd
 1  4.693  3.548 ± 0.019
 2  4.995 3.676 ± 0.020
 3  9.342  4.887 ± 0.026
 4  10.120  5.036 ± 0.027
 5  10.683  5.136 ± 0.027
 6  11.507  5.272 ± 0.027
 7  12.220  5.382 ± 0.028
 8  13.614  5.578 ± 0.028

These values are the means ± standard deviations of three independent determinations

Validity criteria fulfilled:
yes

Description of key information

Key value for chemical safety assessment

Koc at 20 °C:
3 532

Additional information

An OECD 121 study was conducted on Dibenzylbenzene, ar-methyl derivative. The log Koc was calculated to be between 3.548 and 5.578.

[LogKoc: 3.548]