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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:
2017-10-14 to 2018-05-07
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:
soil/sewage sludge
Details on study design: HPLC method:
EQUIPMENT
- Apparatus: HPLC equipment
- Column:
Stationary phase: Zorbax Eclipse XDB-CN
Material: stainless steel
- Detection system: variable wavelength detector

MOBILE PHASES
- Type: Methanol / demineralized water 55:45 % (v/v)
- pH: 6.4

DETERMINATION OF DEAD TIME
- Method: the dead time is determined by using a “dead time marker”
Key result
Type:
log Koc
Value:
5.5 dimensionless
pH:
6.4
Temp.:
25 °C
Details on results (HPLC method):
- Details of fitted regression line (log k' vs. log Koc): Details available in the section “Any other information on results including tables”
- Graph of regression line attached: Yes, in the section “Attached background material”

Individual results


Table 1: Determination of the dead time t0


 


















Dead time marker



tR / min


1st Measurement



tR / min


2nd Measurement



tR / min


Mean



Formamide



1.71



1.71



1.71



 


Dead time: t0 = 1.71 min


 


Table 2: Calibration data - 1st measurement


 






























































Calibration substance



1st Inj.


tR / min



k



log k



log Koc



Acetanilide



2.16



0.27



-0.57



1.25



Atrazin



2.59



0.52



-0.28



1.81



Triadimenol



3.50



1.05



0.02



2.40



Linuron



3.96



1.32



0.12



2.59



Pyrazophos



6.93



3.06



0.49



3.65



Diclofop-methyl



9.01



4.28



0.63



4.20



4,4' DDT



24.74



13.50



1.13



5.63



 


Regression: LogKoc =a + b . logk


Parameters: a = 2.506


b = 2.602


r2= 0.9864


 


Table 3: log Koc of the test item - 1st measurement


 




















Test Item



1st Inj.


tR / min



k



log k



log Koc



Test item



25.24



13.80



1.14



5.47



 


Table 4: Calibration data – 2nd measurement


 






























































Calibration substance



1st Inj.


tR / min



k



log k



log Koc



Acetanilide



2.17



0.27



-0.57



1.25



Atrazin



2.60



0.52



-0.28



1.81



Triadimenol



3.50



1.05



0.02



2.40



Linuron



3.94



1.31



0.12



2.59



Pyrazophos



6.90



3.05



0.48



3.65



Diclofop-methyl



9.00



4.27



0.63



4.20



4,4' DDT



24.65



13.45



1.13



5.63



 


Regression: log Koc = a + b . logk


Parameters: a = 2.504


b = 2.612


r2= 0.9870


 


Table 5: log Koc of the test item - 2nd measurement


 




















Test Item



1st Inj.


tR / min



k



log k



log Koc



Test item



24.86



13.57



1.13



5.46



 


The test item had a mean adsorption coefficient log Koc of 5.5.

Validity criteria fulfilled:
yes
Conclusions:
The adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.
Executive summary:

The adsorption coefficient of the test item was determined according to the HPLC method described in the EU Method C.19 and OECD TG 121. Under the test conditions, the adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.

Description of key information

The adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg (reference 5.4.1-1).

Key value for chemical safety assessment

Koc at 20 °C:
316 227.77

Additional information

The adsorption coefficient of the test item was determined according to the HPLC method described in the EU Method C.19 and OECD TG 121. Under the test conditions, the adsorption coefficient of the test item was found to be log Koc= 5.5. The Koc was calculated to be 316227.77 L/kg.