o-cresol

Adsorption / desorption

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)

GLP compliance:

no

Type of method:

batch equilibrium method

Media:

soil

Radiolabelling:

no

Test temperature:

20 +/-1 °C

Analytical monitoring:

yes

Details on test conditions:

Soil: Brookston clay loam soil (type Argiaquoll, fine, loamy, mixed, mesic), collected from top 15 cm air-dried, 5.10% organic matter, pH 5.7 soil/solution ratio 1:10 TS concentrations 5, 10, 20, 30, 50 mg/l, deoxygenated by purging with N2 and H2 (9:1 v/v)

Type:

Koc

Value:

22

Transformation products:

not measured

Details on results (Batch equilibrium method):

predicted Koc = 18

Validity criteria fulfilled:

not specified

Conclusions:

The Koc of o-cresol was determined with batch equilibrium methods. In the experiment, similar to OECD Guideline 106 a Koc of 22 was obtained for clay.

Executive summary:

The distribution between the organic phase of soil solids and water was determined in batch equilibrium experiments similar to the OECD guideline 106. For a clay loam soil determined a Koc value of 22.

Reference 2

Endpoint:

adsorption / desorption: screening

Remarks:

adsorption

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

Investigations on sorption properties of brown coal sediments originating from a pond near Leipzig (Germany)

GLP compliance:

not specified

Type of method:

batch equilibrium method

Media:

sediment

Radiolabelling:

yes

Test temperature:

room temperature

Analytical monitoring:

yes

Details on sampling:

GC/MS analysis

Details on matrix:

properties of coal sediment: 6.5 - 16.9 wt% organic matter and 52 wt% organic carbon

Type:

log Koc

Value:

1.75

Temp.:

25 °C

% Org. carbon:

52

Remarks on result:

other: coal sediment

Type:

log Koc

Value:

1.7

Temp.:

25 °C

% Org. carbon:

52

Remarks on result:

other: river sediment

Transformation products:

not measured

Reported value of 1.75 referes to coal sediment. A log Koc of 1.7 was determined for river sediment.

Conclusions:

In experiments using sediments Koc values of 50 and 56 for o-cresol were determined. The values suggest a low potential for adsorption in soil and sediment.

Executive summary:

Kopinke (1995) studied the sorption properties of sediments using the batch equilibrium method. A Koc of 50 and 56 was found for coal and river sediment, respectively. The values suggest a low potential for adsorption in soil and sediment.

Description of key information

The experimentally determined Koc values for o-cresol are: 22 for a clay loam, 50 for coal and 56 for river sediment.
As a worst-case assumption, the lowest experimentally determined Koc value of 22 is taken into account for further assessment.

Key value for chemical safety assessment

Koc at 20 °C:

22

Additional information

The distribution between the organic phase of soil solids and water was determined in batch equilibrium experiments similar to the OECD guideline 106. For a clay loam soil a Koc of 22 was determined.

In an experiment the sorption properties of o-cresol in sediments using the batch equilibrium method was determined. A Koc of 50 and 56 was found for coal and river sediment, respectively.

The Koc values suggest a low potential for adsorption for o-cresol in soil and sediment.