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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:
04 April 2016 to 09 Sep 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
None
Qualifier:
according to guideline
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
Version / remarks:
30 May 2008
Deviations:
no
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:
22 January 2001
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method
Media:
other: sludge
Specific details on test material used for the study:
Identification: FAT 21036/G TE
Appearance/Physical state: Blue solid
Batch: AT-0033945200
Purity: 64.5 %
Expiry date: 13 April 2020
Storage conditions: Approximately 4 °C, in the dark
Radiolabelling:
no
Test temperature:
30ºC
Details on study design: HPLC method:
Determination of retention time
The sample, dead time and reference standard solutions were injected in duplicate using the following HPLC parameters:
HPLC System: Agilent Technologies 1200 Series, incorporating autosampler and workstation
Detector type: Ultra-violet (UV)
Column: XSelect HSS Cyano, 5µm (150 x 4.6 mm id)
Column temperature: 30 ºC
Mobile phase: Methanol: [pH 7 (phosphate) buffer solution*] (55:45 v/v)
pH of the pH 7 (phosphate) buffer solution: 7.1
Flow-rate: 1.0 mL/min
Injection volume: 10 µL
UV detector wavelength: dead time and reference standards: 210 nm, sample: 590 nm
Analytical monitoring:
not specified
Key result
Sample No.:
#1
Type:
Koc
Value:
17.8 dimensionless
Temp.:
30 °C
Remarks on result:
other: pH not available
Key result
Sample No.:
#1
Type:
log Koc
Value:
1.25 dimensionless
Temp.:
30 °C
Remarks on result:
other: pH not available

Adsorption Coefficient

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

 Injection   Retention time (mins)   Capacity factor (k') Log10 k'   Log10 Koc  Mean log10 Koc  Adsorption Coefficient
 1  1.958  <0.357  <-0.447  <1..25  <1.25  <17.8
 2  1.963  <0.357  <0.447  <1.25  <1.25  <17.8

Standard

Retention time (mins)

Mean retention time (mins)

Capacity factor (k')

 

Log10k'

 

Log10Koc

Injection 1

Injection 2

Acetanilide

2.638

2.638

2.368

0.357

-0.447

1.25

Phenol

2.512

2.512

2.512

0.292

-0.534

1.32

Atrazine

3.649

3.654

3.652

0.878

-0.056

1.81

Isoproturon

3.926

3.926

3.296

1.02

0.008

1.86

Triadimenol

5.190

5.190

5.190

1.67

0.223

2.40

Linuron

5.296

5.301

5.299

1.73

0.237

2.59

Naphthalene

4.640

4.631

4.636

1.39

0.141

2.75

Endosulfan-diol

6.341

6.346

6.344

2.26

0.355

3.02

Fenthion

7.809

7.818

7.814

3.02

0.480

3.31

a-Endosulfan

10.943

10.948

10.946

4.63

0.666

4.09

Diclofop-methyl

11.929

11.934

11.932

5.14

0.711

4.20

Phenanthrene

8.567

8.562

8.565

3.41

0.532

4.09

DDT

22.828

22.823

22.826

10.7

1.03

5.63

Overall log10 Koc:              Less than 1.25

Adsorption coefficient:        Less than 17.8

Validity criteria fulfilled:
not specified
Conclusions:
The adsorption coefficient (Koc) of the test item has been determined to be less than 17.8, log10 Koc less than 1.25. These values indicate that the test item has very high mobility.
Executive summary:

The determination was carried out using the HPLC screening method, 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. Based on the findings, the adsorption coefficient was determined as less than 17.8, log10 Koc less than 1.25. These values indicate that the test item has very high mobility.

Description of key information

The adsorption coefficient of FAT 21036/G was determined according to EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC)) and OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC)). Based on the findings, the adsorption coefficient was determined as follows-

Less than 17.8, log10 Koc less than 1.25. These values indicate that the test item has very high mobility.

Key value for chemical safety assessment

Koc at 20 °C:
17.8

Additional information