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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:
6 Dec 2016 to 20 Dec 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
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))
Version / remarks:
January, 2001
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))
Version / remarks:
May, 2008
GLP compliance:
yes (incl. certificate)
Type of method:
HPLC estimation method
Media:
soil
Test material information:
Composition 1
Radiolabelling:
no
Test temperature:
30°C
Details on study design: HPLC method:
TEST SYSTEM
The determination was carried out by the HPLC screening method, using a procedure 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. The test system utilized a high performance liquid chromatograph. A commercially available cyanopropyl reverse phase HPLC column containing lipophilic and polar moieties was used.

PREPARATION OF SAMPLE SOLUTION
Test item (0.1949 g) was diluted to 20 mL with methanol to give 9.75 x 103 mg/L.

PREPARATION OF DEAD TIME SOLUTION
The dead time was determined by measuring the retention time of formamide (purity* 99.94%) of a 656 mg/L solution in methanol:water (55:45 v/v).

PREPARATION OF REFERENCE ITEM SOLUTIONS
Solutions of reference standards were prepared in methanol. See the table under 'Any other information on materials and methods incl. tables'.

DETERMINATION TIME
The sample, dead time and reference standard solutions were injected in duplicate using the following HPLC parameters:
- HPLC System: Agilent Technologies 1100, incorporating workstation and autosampler
- Detector type: variable wavelength (VW)
- Column: Cyano 5 µm (150 x 4.6 mm id)
- Column temperature: 30 °C
- Mobile phase: methanol:water (55:45 v/v)
- pH of mobile phase: 7.3
- Flow-rate: 1.0 mL/min
- Injection volume: 10 µL
- VW detector wavelength: 210 nm (standards)
- 282 nm (sample)

CONSTRUCTION OF CALIBRATION CURVE
A correlation of log k' versus log Koc of the reference standards was plotted using linear regression. The capacity factors (k') for the reference standards were calculated.

ADSORPTION COEFFICIENT
Initially the capacity factor of the test item was calculated. The adsorption coefficient was then calculated with reference to the calibration curve.
Key result
Type:
Koc
Value:
ca. 374 dimensionless
Key result
Type:
log Koc
Value:
ca. 2.57 dimensionless
Details on results (HPLC method):
ADSORPTION COEFFICIENT OF THE SAMPLE
The retention times, capacity factor and log10 Koc value determined for the sample are shown in the table under 'Any other information on results incl. tables'. The Log10 Koc was determined to be 2.57 (Koc-value of 3.74E+02).

Table: The retention times, capacity factor and log10 Koc value determined for the sample

Injection

Retention time (mins)

Capacity Factor (k’)

Log10 k’

Log10 Koc

1

3.528

0.596

-0.225

2.57

2

3.533

0.598

-0.223

2.58

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient of Orivone has been determined to be 3.74E+02 (Log10 Koc 2.57).
Executive summary:

The adsorption coefficient of Orivone has been determined to be 3.74 x 10² (log10 Koc 2.57) using the HPLC screening method, designed to be compatible with Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001 Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Description of key information

The adsorption coefficient of Orivone has been determined to be 3.74E+02 (log10 Koc 2.57) using the HPLC screening method, designed to be compatible with Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001 Method C.19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Key value for chemical safety assessment

Koc at 20 °C:
374

Additional information

[LogKoc: 2.57]