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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:
July 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method
Test temperature:
20°C
Analytical monitoring:
yes
Details on sampling:
Performance of the Test
Preparation of sample solution
Test item (0.0512 g) was diluted to 100 ml with tetrahydrofuran (THF) to give a concentration of 0.512 g/L.
Preparation of dead time solution
The dead time was determined by measuring the retention time of formarnide (purity 99.94%, 807 mg/L solution in THF : water 55:45). Mean Retention Time (min ) = 1,7.
Key result
Type:
log Koc
Value:
>= 5.63
Temp.:
20 °C
Key result
Type:
Koc
Value:
> 427 000
Temp.:
20 °C
Details on results (HPLC method):
See details (tables) below
Transformation products:
no

The method guidelines for the test state that methanol is the preferred solvent for mobile phase; however, the test material demonstrated insufficient solubility in methanol for this to be practical. Therefore, tetrahydrofuran was used in place of methanol in preparing the mobile phase for the testing.


- Retention times of reference substances used for calibration:





















Dead Time



Retention Time (min)



Mean Retention Time (min)



Injection 1



Injection 2



Formamide



1,751



1,751



1,751



 


 







































































































































 


Standard



Retention Time (min)



Mean Retention Time (min)



Capacity Factor (k')



 


Log10 k'



 


Log10 Koc



Injection 1



Injection 2



Acetanilide



2.403



2.402



2.403



0.372



-0.429



1.25



Phenol



2.831



2.831



2.831



0.617



-0.210



1.32



Atrazine



3.236



3.235



3.236



0.848



-7.17 X 10"2



1.81



Isoproturon



2.787



2.787



2.787



0.592



-0.228



1.86



Triadimenol



3.303



3.302



3.303



0.886



-5.25 X 10-2



2.40



Linuron



3.265



3.266



3.266



0.865



-6.30 X 10"2



2.59



Naphthalene



3.848



3.848



3.848



1.20



7.83 X 10·2



2.75



Endosulfan-diol



3.757



3.754



3.756



1.15



5.87 X 10-2



3.02



Fenthion



4.144



4.142



4.143



1.37



0.135



3.31



a-Endosulfan



6.188



6.120



6.199



2.50



0.397



4.09



Diclofop-methyl



5.235



5.238



5.237



1.99



0.299



4.20



Phenanthrene



4.237



4.238



4.238



1.42



0.152



4.09



DDT



7.446



7.448



7.447



3.25



0.512



5.63



 


- Average retention data for test substance: 








































































































Peak



Injection



Retention Time


(min)



Capacity Factor


(k')



Log10 k'



Log10 Koc



1



1



12.198



5.97



> 5.63



> 4.27 X 105



2



12.217



5.98



>5.63



> 4.27 X 105



2



1



14.235



7.13



>5.63



> 4.27 X 105



2



14.281



7.16



>5.63



> 4.27 X 105



3



1



16.509



8.43



>5.63



> 4.27 X 105



2



16.582



8.47



> 5.63



> 4.27 X 105



4



1



19.320



10.0



> 5.63



> 4.27 X 105



2



19.293



10.0



> 5.63



> 4.27 X 105



5



1



21.986



11.6



> 5.63



> 4.27 X 105



2



22.824



12.0



> 5.63



> 4.27 X 105



6



1



25.458



13.5



> 5.63



> 4.27 X 105



2



26.801



14.3



> 5.63



> 4.27 X 105


Validity criteria fulfilled:
yes
Conclusions:
According to an experimental study TG OECD 121, the adsorption coefficient (Koc) of the test item is greater than 4.27 x 105, resulting in a log10 Koc > 5.63, based on the reference standard with the highest log10 Koc tested. This value indicates that the test material is immobile in soil.
Executive summary:

An experimental study was performed in accordance with GLP and OECD 121 to determine the adsorption coefficient (Koc) of the test item. The log Koc is greater than > 5.63, based on the reference standard with the highest log Koc  tested.  This value indicates that the test material is immobile in soil.

Description of key information

The adsorption coefficient (Koc) of the test material is greater than 4.27 x 105, resulting in a log Koc > 5.63, based on the reference standard with the highest log Koc tested.  This value indicates that the test material is immobile in soil.

Key value for chemical safety assessment

Koc at 20 °C:
427 000

Additional information