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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
The study was conducted between 24 March 2016 and 09 April 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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:
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Sponsor Lot/Batch number 5399561P10
- Expiration date of the lot/batch: 25 January 2020

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature in the dark

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing:
- Preliminary purification step (if any):
- Final dilution of a dissolved solid, stock liquid or gel:
- Final preparation of a solid:

FORM AS APPLIED IN THE TEST (if different from that of starting material)

OTHER SPECIFICS:
Radiolabelling:
no
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
Column : Waters XSelect HSS Cyano 5 mm (150 x 4.6 mm id)
Column temperature : 30 ºC
Mobile phase : Methanol: purified water (55:45 v/v)
100% methanol post 30 minutes for samples
pH of mobile phase : 6.9
Flow-rate : 1.0 mL/min
Injection volume : 10 μL standards, 25 mL samples
UV detector wavelength : 210 nm
Key result
Type:
log Koc
Value:
> 1.25 - < 5.63
Details on results (HPLC method):
- Retention times of reference substances used for calibration: See Table 2
- Details of fitted regression line (log k' vs. log Koc): Y = 0.3355x - 0.7268
- Graph of regression line attached: no
- Average retention data for test substance: 17.9 mins

Table 2: Retention times, capacity factors and log10Kocvalues for reference standards.

 Standard  Mean retention time (mins)  Capacity factor (k')  Log10k'  Log10Koc
 Acetanilide 2.689 

0.365

-0.438

1.25

 Phenol

2.551

0.296 

-0.530 

1.32 

 Atrazine

 3.713

0.885 

-5.31 x 10-2

 1.81

 Isoproturon

 3.962

1.011 

 4.79 x 10-3

1.86

 Triadimenol

 5.278

 1.679

 0.225

 2.40

 Linuron

 5.404

 1.743

 0.214

 2.59

 Naphthalene

 4.677

 1.374

 0.138

 2.75

 Endosulfan-diol

 6.613

 2.357

 0.372

 3.02

 Fenthion

 7.997

 3.060

 0.486

 3.31

 alpha-Endosulfan

 11.167

 4.669

 0.669

 4.09

Diclofop-methyl 

12.078 

 5.131

 0.710

 4.20

Phenanthrene 

 8.658

 3.395

0.831

 4.09

 DDT

 24.083

 11.225

 1.05

 5.63

Table 3: Retention times, capacity factor, log10and Kocvalues for RD14156

 Peak

 Mean retention time (mins)

 Mean capacity factor (k')

 Mean Log10Koc

 Adsorption coeff.

 Mean % area

 1

 2.026

 2.83 x 10-2

 <1.25

 <17.8

 34.8

 2

17.876 

8.08

 4.87

 7.43 x 104

56.5 

 3

 39.090

 18.8

 >5.63

 <4.27 x 105

 5.82
 4  40.465  19.5 >5.63

<4.27 x 105

  0.218
 5  40.842  19.7  >5.63 

<4.27 x 105

  0.156
 6  41.606  20.1   >5.63

 <4.27 x 105

  0.522
 7  42.344  20.5   >5.63

<4.27 x 105

  0.294
 8  42.799  20.7   >5.63

 <4.27 x 105

  1.16
 9  11.010  21.3   >5.63

<4.27 x 105

  0.563

Summary of log10 Koc: <1.25 to >5.63

Adsorptioin coefficient: <17.8 to >4.27 x 105

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient (Koc) of the test item has been determined to have a range of <17.8 to > 4.27 x 105, log10 Koc <1.25 to >5.63, with the largest peak by area percent being represented by an adsorption coefficient 7.43 x 10,000, log10 Koc 4.87.
Executive summary:

The adsorption coefficient (Koc) of the test item has been determined to have a range of <17.8 to >4.27 x 105, log10Koc <1.25 to>5.63, with the largest peak by area being represented by an adsorpton coefficient of 7.43 x 104, log10 Koc4.87, 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 (Koc) of the test item has been determined to have a range of <17.8 to >4.27 x 105, log10Koc<1.25 to>5.63, with the largest peak by area being represented by an adsorpton coefficient of 7.43 x 104, log10Koc4.87, using the HPLC screening method.

Key value for chemical safety assessment

Koc at 20 °C:
74 131

Additional information

[LogKoc: 4.87]