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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:
Experimental phase started 06th June 2016 and completed 15th January 2017. Report issued: 18 April 2017.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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))
Deviations:
no
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))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method
Media:
other: HPLC column
Test temperature:
30°C
Details on study design: HPLC method:
The sample, dead time and reference standard solutions were injected in duplicate using the following HPLC parameters:

HPLC System : Agilent Technologies 1200 Series
Detector types : UV, variable wavelength detector (VWD) Refractive index detector (RID)
Column : XSelect HSS Cyano, 5 µm (150 x 4.6 mm id)
Column temperature : 30 °C
Mobile phase : Methanol: water (55:45 v/v)
pH of the mobile phase : ~6.7
Flow-rate : 1.0 mL/min
Injection volume : 25 µL

RID parameters
(sample and dead time) : Polarity: positive
Temperature : 35 °C

VWD wavelength
(reference standards) : 210 nm
Key result
Sample No.:
#1
Type:
log Koc
Value:
< 1.25 dimensionless
Temp.:
30 °C
Key result
Sample No.:
#2
Type:
log Koc
Value:
< 1.25 dimensionless
Temp.:
30 °C

Calibration

The retention times of the dead time and the retention times, capacity factors (k') and log10Koc 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

2.203

2.203

2.203

Standard

Retention time (mins)

Mean retention time (mins)

Capacity factor (k')

Log10k'

Log10Koc

Injection 1

Injection 2

Acetanilide

2.678

2.678

2.678

0.216

-0.666

1.25

Phenol

2.552

2.555

2.554

0.159

-0.798

1.32

Atrazine

3.644

3.644

3.644

0.654

-0.184

1.81

Isoproturon

3.872

3.872

3.872

0.758

-0.121

1.86

Triadimenol

5.107

5.107

5.107

1.32

0.120

2.40

Linuron

5.218

5.218

5.218

1.37

0.136

2.59

Naphthalene

4.556

4.558

4.557

1.07

2.88 x 10-2

2.75

Endosulfan-diol

6.339

6.342

6.341

1.88

0.274

3.02

Fenthion

7.613

7.618

7.616

2.46

0.390

3.31

a-Endosulfan

10.611

10.619

10.615

3.82

0.582

4.09

Phenanthrene

8.295

8.307

8.301

2.77

0.442

4.09

Diclofop-methyl

11.453

11.468

11.461

4.20

0.624

4.20

DDT

22.421

22.387

22.404

9.17

0.962

5.63

Adsorption Coefficient (Sample)

The retention times, capacity factor and log10Koc value determined for the sample are shown in the following table:

Peak number

Injection

Retention time (mins)

Capacity factor (k')

Log10k'

Log10Koc

Mean log10Koc

Koc

1

1

2.153

-2.27 x 10-2

-

< 1.25

< 1.25

< 17.8

2

2.153

-2.27 x 10-2

-

< 1.25

The test item was determined to have a mobility class of very high. 


Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient (Koc) of the test item has been determined to be less than 17.8, log10 Koc <1.25. The test item was determined to have a mobility class of very high.
Executive summary:

Introduction

The Adsorption/Desorption coefficient of Trimethylolethane was undertaken using a HPLC screening method, designed to be compatible with Method C19 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.

Method

The test system utilised a high performance liquid chromatograph and a commercially available cyanopropyl reverse phase HPLC column containing lipophilic and polar moieties was used.

Conclusion

The adsorption coefficient (Koc) of the test item has been determined to be less than 17.8, log10Koc <1.25. The test item was determined to have a mobility class of very high.

Description of key information

Key value for chemical safety assessment

Koc at 20 °C:
17.8

Other adsorption coefficients

at the temperature of:
30 °C

Additional information

[LogKoc: 1.15]