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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
Study period:
09 April, 2014 to 03 September, 2014
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
Qualifier:
according to guideline
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method
Media:
other: HPLC-column
Specific details on test material used for the study:
Test material: FAT 36034/W
Batch no.: Q30450ADZX
Appearance/color: Solid/red
Radiolabelling:
no
Test temperature:
25 °C
Details on study design: HPLC method:
HPLC-system:
Agilent Technologies 1260 Infinity
Quaternary pump G1311B
Autosampler ALS G1367E
Column oven G1316A
Detector DAD G4212B

Column specification: EC 150/4.6 Nucleodur 100-5 CN-RP 150 x 5
Column temperature: 25 °C
Detection wavelength standard solutions: 220 nm
Detection wavelength test item: 220 nm
Mobile phase: Methanol/water (55/45 ,v/v)
Flow rate: 0.5 mL/min
Injection volume: 2 µL (reference items); 2 µL (test item)
Type:
log Koc
Value:
< 1.5
Temp.:
25 °C
Details on results (HPLC method):
Two measurements were made under identical conditions using the same set of reference items. Four chromatograms of the test item were recorded per measurement. The dead time was determined with sodium nitrate. The whole measurement was accomplished two times to be sure that the variation of the determined log Koc is within a range of ± 0.25 log units and to fulfil the requirements of EC method C.19 and OECD guideline 121 concerning the quality criteria.

FAT 36034/W eluted with a retention time of 4.02 min. The calculated adsorption coefficient is therefore below the determination limit of the method (< 1.5).
Validity criteria fulfilled:
yes
Conclusions:
The mean log Koc for FAT 36034/W was <1.5.
Executive summary:

The aim of this study was the determination of the adsorption coefficient of the test item FAT 36034/W TE by high performance liquid chromatography (HPLC) method according to EC method C.19 and OECD guideline 121.

The analysis was performed on an analytical column packed with a commercially available cyanopropyl solid phase containing lipophilic and polar moieties. A moderately polar stationary phase based on a silica matrix was used (Nucleodur 100-5 CN-RP). A 55/45 (v/v) methanol water mixture was used as mobile phase and the column temperature was 25 °C.

The results are listed below:

Peak No.

Mean retention time of two runs

[min]

Absolute deviation

[min]

Mean log Kocof two runs

1

4.02

0.00

< 1.5* (0.69)

*: below determination limit of the method

Description of key information

The adsorption coefficient for FAT 36034/W was <1.5 (log Koc).

Key value for chemical safety assessment

Koc at 20 °C:
31.6

Additional information

The aim of this study was the determination of the adsorption coefficient of the test item FAT 36034/W by high performance liquid chromatography (HPLC) method according to EC method C.19 and OECD guideline 121. The analysis was performed on an analytical column packed with a commercially available cyanopropyl solid phase containing lipophilic and polar moieties. A moderately polar stationary phase based on a silica matrix was used (Nucleodur 100-5 CN-RP). A55/45 (v/v) methanol water mixture was used as mobile phase and the column temperature was 25 °C.


The results are listed below:


 


















Peak No.



Mean retention time of two runs


[min]



Absolute deviation


[min]



Mean log Kocof two runs



1



4.02



0.00



< 1.5* (0.69)



*: below determination limit of the method


 


[LogKoc: 1.5]