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Environmental fate & pathways

Adsorption / desorption

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Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
Version / remarks:
1981
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: requirements of the Dutch Guidelines
Version / remarks:
June 1991
Deviations:
no
GLP compliance:
yes
Type of method:
batch equilibrium method
Media:
soil
Specific details on test material used for the study:
Batch: 414-05
Radiochemical purity: 95.8%
Chemical purity: 87%
Radiolabelling:
yes
Test temperature:
20 ± 2 °C
Analytical monitoring:
yes
Remarks:
LSC - Liquid scintillation counter
Matrix no.:
#1
Matrix type:
sand
% Clay:
3.8
% Silt:
7
% Sand:
89.2
% Org. carbon:
3.2
pH:
5.2
Matrix no.:
#2
Matrix type:
sand
% Clay:
3.8
% Silt:
4.8
% Sand:
91.4
% Org. carbon:
2.1
pH:
5.3
Matrix no.:
#3
Matrix type:
sand
% Clay:
3.9
% Silt:
6.7
% Sand:
85.4
% Org. carbon:
2.4
pH:
5.2
Details on matrix:
The 3 soils were collected from different locations in the Netherlands. The soils were stored at 3 ± 2 °C.
Details on test conditions:
- The test was carried out in acintilation vials of 20 mL closed with screw-caps. The soil were sieved (2 mm mesh) to remove coarse particles.
- The vial with [14C] MCPP-P was rinced 15 times with 1 mL 0.05 M CaCl2 solution. CaCl2 solution was added to a volume of 150 mL. 5.9 mg MCPP-P was dissolved in 100 mL CaCl2 solution. 10 mL of this solution was pipetted to the solution with [14C] MCPP-P and the total volume was brought to 500 mL. The stock solution contained 5 mg/L test substance.
- 1 g dry weight soil was placed into each vial together with 10 mL 0.05 M CaCl2 solution containing 5 mg/L [14C]-substance. Duplicate samples were taken after 1, 4, 20 and 48 h (after shaking at 20 ± 2 °C) to determine the equilibrium time of the adsorption. The vials were centrifuged at gmax = 450 for 5 minutes. Duplicate samples of 1mL were pipetted into scintillation vials containing 10 mL of Ultima Gold.
Key result
Type:
Koc
Value:
146 L/kg
pH:
5.2
Temp.:
20 °C
Remarks on result:
other: geometric mean
Key result
Sample No.:
#1
Type:
Koc
Value:
139 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
3.2
Sample No.:
#1
Type:
Kd
Value:
4.5 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
3.2
Key result
Sample No.:
#2
Type:
Koc
Value:
167 L/kg
pH:
5.3
Temp.:
20 °C
% Org. carbon:
2.1
Sample No.:
#2
Type:
Kd
Value:
3.5 L/kg
pH:
5.3
Temp.:
20 °C
% Org. carbon:
2.1
Key result
Sample No.:
#3
Type:
Koc
Value:
135 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
2.4
Sample No.:
#3
Type:
Kd
Value:
3.3 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
2.4

MCPP-P acid in acidic soils:

Koc: 135 - 167 (Kd: 3.3 - 4.5) in 3 sandy soils (pH: 5.2 - 5.3)

MCPP-P acid is a weak acid, thus, the adsorption is expected to be higher the lower the pH is.

Validity criteria fulfilled:
yes
Conclusions:
For MCPP-P acid, the hydrolysis product of MCPP-P 2-EHE, the Koc was in the range of 135 - 167 determined in 3 sandy soils. Based on this results MCPP-P acid has a low sorption potential to soil and sediment, and a moderate migration potential to groundwater.
Executive summary:

MCPP-P 2-EHE hydrolyses rapidly in natural water. Therefore, the hydrolysis product MCPP-P acid was used for further assessment of MCPP-P 2-EHE with respect to its potential for adsorption on soil.

 

Determined in 3 sandy soils the Koc of MCPP-P acid was in the range of 135 - 167. The geometric mean of the Koc of 146 is used for further assessment. MCPP-P acid has a low sorption potential to soil and sediment, and a moderate migration potential to groundwater.

Endpoint:
adsorption / desorption: screening
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
Please refer to section 13 for "Read Across justification".
Reason / purpose for cross-reference:
read-across source
Key result
Type:
Koc
Value:
146 L/kg
pH:
5.2
Temp.:
20 °C
Remarks on result:
other: geometric mean
Key result
Sample No.:
#1
Type:
Koc
Value:
139 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
3.2
Sample No.:
#1
Type:
Kd
Value:
4.5 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
3.2
Key result
Sample No.:
#2
Type:
Koc
Value:
167 L/kg
pH:
5.3
Temp.:
20 °C
% Org. carbon:
2.1
Sample No.:
#2
Type:
Kd
Value:
3.5 L/kg
pH:
5.3
Temp.:
20 °C
% Org. carbon:
2.1
Key result
Sample No.:
#3
Type:
Koc
Value:
135 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
2.4
Sample No.:
#3
Type:
Kd
Value:
3.3 L/kg
pH:
5.2
Temp.:
20 °C
% Org. carbon:
2.4

Description of key information

For MCPP-P acid the Koc values determined were 135 - 167 in 3 different soils at pH 5.2 - 5.3. The geometric mean of Koc is 146 and the log Koc is 2.16, respectively.

Key value for chemical safety assessment

Koc at 20 °C:
146

Additional information

Adsorption was investigated with MCPP-P acid as the main hydrolysis product (read-across).

 

Determined in 3 sandy soils the Koc of MCPP-P acid was in the range of 135 - 167. The geometric mean of the Koc of 146 is used for further assessment. MCPP-P acid has a low sorption potential to soil and sediment, and a moderate migration potential to groundwater.

[LogKoc: 2.16]