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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
Reliability:
2 (reliable with restrictions)
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
GLP compliance:
yes
Type of method:
batch equilibrium method
Media:
soil
Test temperature:
25 °C
Analytical monitoring:
not specified
Matrix no.:
#1
Matrix type:
sandy loam
Matrix no.:
#2
Matrix type:
sandy clay loam
Matrix no.:
#3
Matrix type:
clay
Sample No.:
#1
Duration:
2 h
Sample No.:
#2
Duration:
2 h
Sample No.:
#3
Duration:
2 h
Sample no.:
#1
Duration:
2 h
Sample no.:
#2
Duration:
2 h
Sample no.:
#3
Duration:
2 h
Key result
Sample No.:
#1
Type:
Koc
Value:
126 dimensionless
% Org. carbon:
1.32
Key result
Sample No.:
#2
Type:
Koc
Value:
2 053 dimensionless
% Org. carbon:
3.73
Key result
Sample No.:
#3
Type:
Koc
Value:
252 dimensionless
% Org. carbon:
1.65
Duration:
2 h
% Adsorption:
96.2
Duration:
2 h
% Desorption:
>= 1.5 - <= 3.1
Transformation products:
no

Adsorption kinetics:

96.2 % was absorbed within 2 hours

Adsorption isotherms:

126 to 2053 (Freundlich adsorption constants)

Adsorptions coefficient:

126 to 2053 (Freundlich adsorption constants).

Mass balance:

Recovery 95 - 107 %

Validity criteria fulfilled:
not specified
Conclusions:
The test item was strongly adsorbed to all three soils tested. Based on the results obtained, the test item can be regarded as having a low potential for motility in soil.
Executive summary:

The adsorption/desorption behaviour of the test substance was determined in a batch equilibrium method equivalent to OECD guideline 106 (Huntingdon, ECHA RSS, 2017). Somersham sandy loan, Sandiacre clay loam and Alconbury clay were tested. The following results were obtained:


 










































Soil type



Organic



Ka



Koc



Kom



1/n



Kd



Sandy loam



1.32



126



9563



5560



0.72



474



Clay loam



3.73



2053



55023



31990



1.04



342



Clay



1.65



252



15255



8869



0.83



15



Ka = Freundlich adsorption coef


Kom = Coefficient of adsorption per unit organic matter


1/n = Slope of the Freundlich adsorption isotherm


Kd = Freundlich desorption coefficient


 


Between 96.2 % of the test substance were adsorbed after 2 hours. Only 1.5 to 3.1 % had been desorbed after 2 hours. The test item was strongly adsorbed to all three soils tested. Based on the results obtained, the test item can be regarded as having a low potential for motility in soil.

Description of key information

Key value for chemical safety assessment

Additional information

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