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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:
From July 2017 to August 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
Specific details on test material used for the study:
- Appearance: Colourless liquid
- Test item storage: At room temperature protected from light
- Purity/Composition correction factor: No correction factor required
Radiolabelling:
no
Details on study design: HPLC method:
- Instrument: Alliance Separation Module 2695 (Waters, Milford, MA, USA)
- Detector Refractive Index detector 2414 (Waters)
- Column: Hypersil BDS-CN, 150 mm x 4.6 mm i.d., dp = 5 μm (Thermo Fisher Scientific, Waltham, MA, USA)
- Column temperature: 35°C +/- 1°C
- Injection: volume 10 μL
- Mobile phase: 55/45 (v/v) methanol/water
- Flow: 1.0 mL/min
- RI detection:
Temperature: 30°C
Sensitivity: 4
Time constant :1.0 seconds
Polarity :positive
Key result
Type:
log Koc
Value:
4.3 dimensionless
Type:
Koc
Value:
20 000 dimensionless
Details on results (HPLC method):
- Retention times of reference substances used for calibration: See table in "any other information on results"
- Details of fitted regression line (log k' vs. log Koc): The equation of the regression line was: log k’ = 0.370 x log Koc – 1.36 (r = 0.91, n = 16).

Koc HPLC Method

UPLC-UV chromatograms of the test item solution and corresponding blank are shown in the table below. In the chromatogram of the test solution, one major test item peak was observed.

 Substance

Retention time (min)

tr,1/ tr,2 

  Log Koc Koc
 Formamide (t0)  2.109 / 2.110    

Acetanilide

Monuron

2,5-Dichloroaniline

Naphtalene

Benzoic acid phenylester

Fenthion

Phenantrene

4,4'-DDT

2.205 / 2.207

2.761 / 2.761

3.223 / 3.223 

3.353 / 3.355

3.445 / 3.455

4.896 / 4.898

4.673 / 4.673

8.957 / 8.960 

1.26

1.99

2.55

2.75

2.87

3.31

4.09

5.63

  
Test item - Peak 1   5.691 / 5.689 4.30 20000
Validity criteria fulfilled:
not applicable
Conclusions:
The organic carbon/water partition Koc of the test item at neutral pH was 20000 (log Pow = 4.30).
Executive summary:

The organic carbon/water partition Koc of the test item was determined in a GLP-compliant study performed in accordance with EC C.19 Method and OECD Guideline No. 121, using the HPLC method. The organic carbon/water partition Koc of the test item at neutral pH was 2000 (log Koc = 4.30).

Description of key information

The organic carbon/water partition Koc of the test item was determined in a GLP-compliant study performed in accordance with EC C.19 Method and OECD Guideline No. 121, using the HPLC method. The organic carbon/water partition Koc of the test item at neutral pH was 20000 (log Koc = 4.30).

Key value for chemical safety assessment

Koc at 20 °C:
20 000

Additional information

The organic carbon/water partition coefficient Koc of the test item was determined in a GLP-compliant study performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and is selected as a key study for the endpoint.