Registration Dossier
Registration Dossier
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EC number: 267-051-0 | CAS number: 67774-74-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- 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.
Reference
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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