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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Reason / purpose for cross-reference:
read-across source
Key result
Type:
log Koc
Value:
> 5.63 dimensionless
Temp.:
40 °C
Details on results (HPLC method):
Mean log10 Koc: >5.63
Adsorption coefficient: >4.27 x 10E5

Results

Calibration

The retention times of formamide and the retention times, capacity factors (k) and log10 Koc values for the reference standards are shown in the two following tables:

Dead Time

Retention Time (mins)

Mean Retention Time (mins)

Injection 1

Injection 2

Formamide

3.064

3.124

3.094

Standard

Retention Time (mins)

Mean Retention Time (mins)

Capacity Factor (k)

Log10 k

Log10 Koc

Injection 1

Injection 2

Acetanilide

3.821

3.820

3.821

0.235

-0.629

1.25

Phenol

3.846

3.847

3.847

0.243

-0.614

1.32

Isoproturon

4.621

4.623

4.622

0.494

-0.306

1.86

Triadimenol

5.377

5.372

5.375

0.737

-0.132

2.40

Linuron

5.804

5.802

5.803

0.876

-5.77 x 10-2

2.59

Naphthalene

5.642

5.638

5.640

0.823

-8.47 x 10-2

2.75

Endosulfan-diol

6.998

6.995

6.997

1.26

0.101

3.02

Fenthion

7.852

7.860

7.856

1.54

0.187

3.31

α-Endosulfan

10.090

10.096

10.093

2.26

0.355

4.09

Phenanthrene

8.375

8.374

8.375

1.71

0.232

4.09

Diclofop-methyl

9.905

9.904

9.905

2.20

0.343

4.20

DDT

19.904

19.913

19.909

5.44

0.735

5.63

Adsorption coefficient of sample

The retention times, capacity factors and log10 Koc values determined for the sample are shown in the following table:

Injection

Retention Time (mins)

Capacity Factor (k)

Log10 k

Log10 Koc

1

34.444

>5.44

>0.735

>5.63

2

34.466

>5.44

>0.735

>5.63

Mean log10 Koc: >5.63

Adsorption coefficient: >4.27 x 105

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient (Koc) of the test material has been determined to be >4.27 x 10E5, log10 Koc >5.63
Executive summary:

Adsorption Coefficient

Greater than 4.27 x 105, log10 Koc >5.63, using the HPLC screening method, Method C19 of Commission Directive 2001/59/EC.

Description of key information

The adsorption coefficient (Koc) of the read across substance (C18-C50 branched, cyclic and linear hydrocarbons – Distillates (CAS# 848301-69-9) was determined to be >4.27 x 10E5, log10 Koc >5.63.

The data available for C18-C50 branched, cyclic and linear hydrocarbons – Distillates (CAS# 848301-69-9) is used for read across to Alkanes, C16 -47, branched and linear.

Key value for chemical safety assessment

Koc at 20 °C:
5.63

Additional information

The determination for the read across substance C18 -C50 branched, cyclic and linear hydrocarbons - Distillates was carried out using the HPLC screening method, Method C19 of Commission Directive 200l/59/EC (which constitutes Annex V of Council Directive 67/548/EEC). The adsorption coefficient (Koc) of the test material was determined to be >4.27 x 105, log10 Koc >5.63. The test material was known to primarily be a complex mixture of alkanes. As the test material eluted after the mobile phase had been adjusted to 100% solvent, all components were deemed to be greater than that of the highest calibration standard.