(1R)-1-[(4R,4aR,8aS)-2,6-bis(3,4-dimethylphenyl)tetrahydro[1,3]dioxino[5,4-d][1,3]dioxin-4-yl]ethane-1,2-diol

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Study period:

6th December 2001 to 18th December 2001

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2002

Report date:

2002

Materials and methods

Test guideline

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:

HPLC Screening method, Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC estimation method

Media:

soil/sewage sludge

Test material

Test material information

Constituent 1

Details on test material:

Sponsor's identification: Experimental 11334-18

Data relating to the identity, purity and stability of the test material are the responsibility of the Sponsor.

Radiolabelling:

no

Study design

Test temperature:

Column temperature: 40 °C

HPLC method

Details on study design: HPLC method:

EQUIPMENT
- Apparatus: HPLC
- Type: Agilent Technologies 1050, incorporating autosampler and workstation
- Type, material and dimension of analytical (guard) column: Luna CN (250 x 4.6 mm id)
- Detection system: UV detector (wavelength for dead time and reference standards: 210 nm; wavelength for sample: 268 nm)

MOBILE PHASES
- Type: Methanol : Water (55:45 v/v); Flow rate: 1 mL/min
- Experiments with additives carried out on separate columns: No
- pH: 6.4 (the pH was not corrected)
- Solutes for dissolving test and reference substances: Not applicable

DETERMINATION OF DEAD TIME
- Method: The dead time was determined by measuring the retention time of formamide (664 mg/L solution in methanol).


REFERENCE SUBSTANCES
- Identity: The solutions of reference standards (detailed in Table 1) were prepared in methanol.


DETERMINATION OF RETENTION TIMES
- Quantity of test substance introduced in the column: The test material (0.2470 g) was diluted to 100 mL with dimethylsulfoxide. The injection volume was 5 µL.
- Quantity of reference substances: The concentrations of the reference standards are given in Table 1. The injection volume was 5 µL.
- Intervals of calibration: Not specified


REPETITIONS
- Number of determinations: The sample, formamide and reference standard solutions were injected in duplicate.


EVALUATION
- Calculation of capacity factors k': The capacity factor was determined using:
k = (t^t - t^0)/t^0
where: t^t = retention time (min); t^0 = dead time (min)
- Calculation of retention times: Not specified
- Determination of the log Koc value: The log Koc value was determined with reference to the calibration curve.

Batch equilibrium or other method

Analytical monitoring:

no

Details on sampling:

Not applicable

Details on matrix:

Not applicable

Details on test conditions:

Not applicable

Computational methods:

No dat available

Results and discussion

Adsorption coefficient

Adsorption coefficient 1

Type:

Koc

Value:

1 610

Adsorption coefficient 2

Type:

log Koc

Value:

3.21

Results: HPLC method

Details on results (HPLC method):

- Retention times of reference substances used for calibration: The mean retention time of formamide was 3.268 mins. The retention times, capacity factors and log Koc values for the reference standards are given in Table 2.
- Details of fitted regression line (log k' vs. log Koc): r = 0.947
- Average retention data for test substance: The retention times, capacity factors and log Koc values for the test samples are shown in Table 3. Average retention time was 4.413 mins.

Results: Batch equilibrium or other method

Adsorption and desorption constants:

Not applicable

Recovery of test material:

Not applicable

Concentration of test substance at end of adsorption equilibration period:

Not applicable

Concentration of test substance at end of desorption equilibration period:

Not applicable

Transformation products:

not measured

Details on results (Batch equilibrium method):

Not applicable

Statistics:

Not applicable

Any other information on results incl. tables

Table 2: Results for reference standards

Standard	Mean retention time (mins)	Capacity factor (k)	Log10k	Log10Koc
Acetanilide	3.424	0.04744	-1.321	1.25
Phenol	3.537	0.08231	-1.085	1.32
Atrazine	3.785	0.158	-0.801	1.81
Isoproturon	3.987	0.220	-0.658	1.86
Triadimenol	4.082	0.249	-0.604	2.40
Naphthalene	4.542	0.390	-0.409	2.75
Endosulfan-diol	4.248	0.300	-0.523	3.02
α-endosulfan	5.407	0.654	-0.184	4.09
Phenanthrene	5.483	0.678	-0.169	4.09
Diclofop-methyl	5.232	0.601	-0.221	4.20
DDT	7.753	1.372	-0.137	5.63

Table 3: Results for test samples

Injection	Retention time (mins)	Capacity factor (k)	Log10k	Log10Koc
1	4.408	0.349	-0.457	3.20
2	4.417	0.352	-0.454	3.21

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The adsorption coefficient (Koc) of the test material has been determined to be 1610, log Koc 3.21.

Executive summary:

The adsorption coefficient (Koc) of the test material has been determined to be 1610, log Koc 3.21. The study was performed in accordance with OECD Guideline No. 121.