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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1991
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to guideline
Guideline:
other: ASTM, Draft 09, E47.06: Standard method for determination of sorption constant of organic chemicals in soil and sediments
GLP compliance:
not specified
Type of method:
other:
Media:
soil
Radiolabelling:
yes
Analytical monitoring:
yes
% Clay:
>= 2 - <= 25
% Silt:
>= 11 - <= 84
% Sand:
>= 2.4 - <= 86
% Org. carbon:
>= 0.4 - <= 2
CEC:
>= 5 - <= 25 meq/100 g soil d.w.
Details on matrix:
- organic carbon content 0.4-2.0%; sand 2.4-86%; clay 2-25%; silt 11-84%; cation exchange capacity 5-25 meq/100g
Details on test conditions:
- pH: 4.7-8.1
- Method of preparation of test solution: Aqueous mixtures of 14C-labeled C12 alkylbenzene and four different types of soil were shaken for 24h and centrifuged at 20,000 g.
Duration:
24 h
Key result
Type:
Koc
Value:
22 000 L/kg
Key result
Type:
log Koc
Value:
4.34 dimensionless
Conclusions:
The experimentally determined Koc using four soil types was 22,000.
Executive summary:

This study determined the adsorption/desorption coefficient for the substance. A radiolabelled sample of the substance was mixed with four different soil types for 24 hrs. The samples were centrifuged, then examined for radioactivity. The soil adsorption coefficient was determined to be 22,000.

Description of key information

A study was conducted to determine the adsorption/desorption coefficient of the substance using the ASTM E47.06 Draft method. The Koc was 22000 L/kg.

Key value for chemical safety assessment

Koc at 20 °C:
22 000

Additional information

A study was conducted to determine the adsorption/desorption coefficient of the substance using the ASTM E47.06 Draft method. A radiolabeled sample of substance wsa mixed with four different soil types for 24 hours, then centrifuged and analyzed for radioactivity. The resultant soil adsorption coefficient (Koc) was determined to be 22000 and is used as the key value.

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